Document:

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                                                                   EXHIBIT 10.15

                          ROVING SOFTWARE INCORPORATED

           AMENDED AND RESTATED PREFERRED INVESTORS' RIGHTS AGREEMENT

                                   DATED AS OF

                                  MAY 12, 2006

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                                TABLE OF CONTENTS

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<S>                                                                         <C>
1.       Definitions....................................................      1
         1.1      Capitalized Terms.....................................      1
         1.2      Definitions...........................................      1

2.       Registration Rights............................................      4
         2.1      Demand Registration Rights............................      4
         2.2      Company Registration..................................      7
         2.3      Obligations of the Company............................      7
         2.4      Furnish Information...................................     10
         2.5      Expenses of Registration..............................     10
         2.6      Damages...............................................     10
         2.7      Indemnification.......................................     11
         2.8      Reports Under Securities Exchange Act of 1934.........     13
         2.9      Form S-3 Registration.................................     14
         2.10     Assignment of Registration Rights.....................     15
         2.11     Limitations on Subsequent Registration Rights.........     15
         2.12     "Market Stand-Off" Agreement..........................     15
         2.13     Obligations of the Holders............................     16

3.       Covenants of the Company.......................................     16
         3.1      Pre-emptive Rights....................................     16
         3.2      Delivery of Financial Statements......................     18
         3.3      Budget and Operating Forecast; Inspection.............     18
         3.4      Board of Directors; Meetings; Indemnification.........     19
         3.5      Composition of Board Committees.......................     19
         3.6      Positive Covenants....................................     20

4.       VOTING RESTRICTIONS............................................     21

5.       Miscellaneous..................................................     22
         5.1      Survival of Covenants.................................     22
         5.2      Legend on Securities..................................     23
         5.3      Successors and Assigns................................     23
         5.4      Governing Law.........................................     23
         5.5      Counterparts..........................................     23
         5.6      Titles and Subtitles; Gender..........................     23
         5.7      Notices...............................................     23
         5.8      Expenses..............................................     24
         5.9      Amendments and Waivers................................     24
         5.10     Additional Parties....................................     24
         5.11     Potential Conflict With Existing Agreement............     25
         5.12     Existing Stock Restriction Agreement..................     25
         5.13     Amendments to Existing Agreements.....................     25
         5.14     Severability..........................................     26
         5.15     Aggregation of Stock..................................     26
         5.16     Entire Agreement; Amendment; Waiver...................     26
         5.17     Consent Under Existing Agreement......................     26
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           AMENDED AND RESTATED PREFERRED INVESTORS' RIGHTS AGREEMENT

      THIS AMENDED AND RESTATED PREFERRED INVESTORS' RIGHTS AGREEMENT (this
"Agreement") is made as of the 12th day of May, 2006, by and among Roving
Software Incorporated, a Delaware corporation (the "Company"), the investors
named on Schedule A attached hereto, as it may be amended from time to time in
accordance with this Agreement (collectively, the "Investors," and each
individually, an "Investor"), and solely with respect to Section 4 below, Gail
F. Goodman, Steven R. Wasserman and Eric Groves (each, a "Common Holder" and
together with any other parties who may become Common Holder parties to this
Agreement pursuant to Section 5.10 below, the "Common Holders").

                                    RECITALS

      WHEREAS, certain of the Investors (the "Current Investors") hold shares of
the Company's Common Stock, $0.01 par value per share (the "Common Stock"),
Series A Preferred Stock, $0.01 par value per share (the "Series A Preferred
Stock"), and Series B Preferred Stock, $0.01 par value per share (the "Series B
Preferred Stock"), and possess certain rights pursuant to a Preferred Investors'
Rights Agreement dated as of November 27, 2002 by and among the Company, the
Current Investors and certain of the Common Holders (the "Current Agreement");

      WHEREAS, certain of the Investors (the "Existing Investors") possess
certain rights pursuant to an Amended and Restated Investors' Rights Agreement
dated as of August 9, 2001 by and among the Company, the Existing Investors and
certain other stockholders of the Company (the "Existing Agreement"); and

      WHEREAS, the Company and the Investors are parties to the Stock Purchase
Agreement of even date herewith (the "Purchase Agreement") relating to the sale
and purchase of shares of the Company's newly created Series C Preferred Stock,
$0.01 par value per share (the "Series C Preferred Stock"), certain of the
Company's and such Investors' obligations under which are conditioned upon the
execution and delivery of this Agreement by the Investors, including Current
Investors holding at least sixty percent (60%) of the Registrable Securities (as
defined in the Current Agreement) outstanding as of the date hereof, and the
Company.

      NOW THEREFORE, in consideration of the mutual promises and covenants set
forth herein, the Investors and the Company hereby amend and restate the Current
Agreement as follows:

      1. DEFINITIONS.

      1.1 Capitalized Terms. Capitalized terms used herein but not defined
herein shall have the meanings ascribed to such terms in the Purchase Agreement.

      1.2 Definitions. The following capitalized terms as used in this Agreement
shall have the meanings set forth below.

            (a) An "Affiliate" of any Person shall mean a Person that directly
or indirectly, through one or more intermediaries, controls, is controlled by or
is under common

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control with the first mentioned Person. A Person shall be deemed to control
another Person if such first Person possesses directly or indirectly the power
to direct, or cause the direction of, the management and policies of the second
Person, whether through the ownership of voting securities, by contract or
otherwise.

            (b) The term "Board of Directors" shall mean the Board of Directors
of the Company.

            (c) The term "Common Stock" shall mean the Company's Common Stock,
and any other securities into which the Company's Common Stock may be converted
or exchanged pursuant to a plan of recapitalization, reorganization, merger,
sale of assets or otherwise.

            (d) The term "Existing Agreement Registrable Securities" shall mean
the Registrable Securities as such term is defined in the Existing Agreement.

            (e) The term "Form S-3" shall mean such form under the Securities
Act as in effect on the date hereof or any registration form under the
Securities Act subsequently adopted by the SEC in lieu of such form as currently
in effect which similarly permits inclusion or incorporation of substantial
information by reference to other documents filed by the Company with the SEC.

            (f) The term "Holder" shall mean any person owning Registrable
Securities or any assignee thereof in accordance with Section 2.10 hereof.

            (g) The term "Investor" shall have the meaning set forth in the
Preamble and shall include all Permitted Transferees.

            (h) The term "Investors' Nominee" shall mean one (1) director
designated by Morgan Stanley Dean Witter Venture Partners IV, L.P., who shall
initially be Patrick Gallagher, one (1) director designated by Commonwealth
Capital Ventures II L.P., who shall initially be Michael T. Fitzgerald, and one
(1) director designated by Greylock XII Limited Partnership, who shall initially
be William S. Kaiser (collectively, the "Investors' Nominees").

            (i) The term "1934 Act" shall mean the Securities Exchange Act of
1934, as amended.

            (j) The term "Permitted Transferee" shall mean with respect to any
Investor, (i) any such Investor's Affiliates, partners, retired partners,
members, employees, general partners or managing members of such Investor; (ii)
a liquidating trust established solely for the benefit of any partners or
members of such Investor; or (iii) any investment fund or other entity now or
hereafter existing which is controlled or managed by an Affiliate of, or shares
the same management company as, such Investor or any other person who acquires
at least eighty percent (80%) of such Investor's shares of Preferred Stock or
Common Stock issued upon conversion of such shares of Preferred Stock; provided
that the Company has been provided written notice of any transfer permitted
under this Section 1.2(j) and such transferee agrees in writing to be bound by
the terms of this Agreement.

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            (k) The term "Person" shall mean an individual, a corporation, a
partnership, a joint venture, a trust, an unincorporated organization, a limited
liability company, and any other entity or organization, governmental or
otherwise.

            (l) The term "Preferred Stock" shall mean the Company's Series A
Preferred Stock, Series B Preferred Stock, and Series C Preferred Stock and any
other securities into which the Series A Preferred Stock, Series B Preferred
Stock, and Series C Preferred Stock may be converted or exchanged pursuant to a
plan of recapitalization, reorganization, merger, sale of assets or otherwise.

            (m) The term "Pro Rata Share" shall mean, with respect to any
Holder, the percentage that the Shares held by such Holders then represents of
all Common Stock of the Company then outstanding, giving effect to the
conversion of all securities convertible into Common Stock on an as converted
basis, and assuming the exercise of all vested outstanding options, warrants or
subscription rights for capital stock of the Company.

            (n) The term "Qualified Public Offering" shall mean the offer and
sale of Common Stock in a firm commitment underwritten public offering pursuant
to an effective registration statement under the Securities Act at a price to
the public of at least $11.898 per share (subject to appropriate adjustment in
the event of any stock dividend, stock split, combination or other similar
recapitalization with respect to the Common Stock), resulting in at least
$25,000,000 of aggregate proceeds to the Company.

            (o) The terms "register," "registered," and "registration" shall
refer to a registration effected by preparing and filing a registration
statement or similar document in compliance with the Securities Act, and the
declaration or ordering of effectiveness of such registration statement or
document.

            (p) The term "Registrable Securities" shall mean (i) the Common
Stock issuable or issued upon conversion of the Series A Preferred Stock, the
Series B Preferred Stock, and Series C Preferred Stock and held by the Investors
or their Permitted Transferees (it being understood that for purposes of this
Agreement, a Person will be deemed to be a Holder (as defined above) whenever
such Person has the right to then acquire or obtain from the Company any
Registrable Securities, whether or not such acquisition has actually been
effected) and (ii) any shares of Common Stock issued or issuable with respect to
any such shares described in clause (i) above by way of a stock dividend or
stock split or in connection with a combination of shares, recapitalization,
merger, consolidation or other reorganization; provided, however, that
notwithstanding anything to the contrary contained herein, "Registrable
Securities" shall not at any time include any securities (I) registered and sold
pursuant to the Securities Act or (II) sold to the public pursuant to Rule 144
promulgated under the Securities Act.

            (q) The number of shares of "Registrable Securities then
outstanding" shall mean the number of shares of Common Stock outstanding and the
number of shares of Common Stock issuable pursuant to then exercisable or
convertible securities that, in either case, are Registrable Securities.

            (r) The term "SEC" shall mean the Securities and Exchange
Commission.

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            (s) The term "Securities Act" shall mean the Securities Act of 1933,
as amended.

            (t) The term "Selling Holders' Counsel" shall mean one (1) counsel
selected by the selling Holders, it being understood and agreed that in the
event of a registration pursuant to which both Holders hereunder and under the
Existing Agreement seek to register Shares, the Holders shall select as the
Selling Holders' Counsel hereunder the same counsel selected as the Selling
Holders' Counsel selected by the Holders under the Existing Agreement.

            (u) The term "Shares" shall mean, with respect to the Investors,
Common Stock issued and held and Common Stock issuable upon conversion of
Preferred Stock then held by the Investors.

      2. REGISTRATION RIGHTS.

      2.1 Demand Registration Rights.

            (a) So long as the Investors beneficially own at least Twenty
Percent (20%) of the Registrable Securities beneficially owned by them as of the
Second Closing (as defined in the Purchase Agreement), or if there is no Second
Closing, as of the date hereof (as adjusted for stock dividends, combinations,
splits, recapitalizations and the like), if the Company shall receive a written
request from the Investors holding at least Fifty Percent (50%) of the
Registrable Securities then outstanding that the Company file a registration
statement under the Securities Act covering the registration and sale of at
least Twenty Percent (20%) of the Registrable Securities then outstanding (or a
lesser percentage if the anticipated aggregate price to the public of the
offering shall exceed an amount equal to Twenty Percent (20%) of the
consideration paid by the Investors with respect to such shares of Preferred
Stock), then the Company shall:

                  (i) within ten (10) days of the receipt thereof, give written
      notice of such request to all Investors; and

                  (ii) file, as soon as practicable and in any event within
      ninety (90) days of the receipt of such request, a registration statement
      with the SEC under the Securities Act covering all Registrable Securities
      which the Investors request to be registered (such request having been
      made within twenty (20) days of the mailing of such notice by the Company
      in accordance with Section 5.7) subject to the limitations of Section
      2.1(b), and thereafter to use its best efforts to cause the registration
      statement to be declared effective as soon as practicable.

            (b) If the Investors initiating the registration request hereunder
(the "Initiating Holders") intend to distribute the Registrable Securities
covered by their request by means of an underwriting, they shall so advise the
Company as a part of their request made pursuant to Section 2.1(a)(i) and the
Company shall include such information in the written notice referred to in
Section 2.1(a). The managing underwriter will be selected by a majority in
interest of the Initiating Holders and shall be reasonably acceptable to the
Company. In such event, the right of any Investor to include its Registrable
Securities in such registration shall be conditioned upon such Investor's
participation in such underwriting and the inclusion of such

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Investor's Registrable Securities in the underwriting (unless otherwise mutually
agreed by a majority in interest of the Initiating Holders, such Investor and
the Company) to the extent provided herein.

            (c) The Company may not cause any other registration of securities
for sale for its own account (other than a registration effected solely to
implement an employee benefit plan or a transaction to which Rule 145 of the
Securities Act is applicable) to become effective within one hundred eighty
(180) days following the effective date of a Qualified Public Offering and
ninety (90) days following the effective date of any registration required
pursuant to this Section 2.

            (d) Notwithstanding the foregoing, if the Company shall furnish to
Investors requesting a registration statement pursuant to this Section 2.1 a
certificate signed by the Chief Executive Officer of the Company stating that in
the good faith judgment of the Board of Directors it would be materially
detrimental to the Company and its stockholders for such registration statement
to be filed and it is therefore essential to defer the filing of such
registration statement, the Company shall have the right to defer taking action
with respect to such filing for a period of not more than ninety (90) days after
receipt of the request of the Initiating Holders; provided, however, that the
Company may not utilize this right more than once in any twelve (12) month
period.

            (e) Notwithstanding any other provisions of this Section 2 to the
contrary, if the Company is advised in writing in good faith by any managing
underwriter of the Company's securities being offered in an underwritten public
offering pursuant to such registration statement that the amount to be sold by
persons other than the Company (collectively, "Selling Stockholders") is greater
than the amount which can be offered without adversely affecting the offering,
the Company may reduce the amount offered for the accounts of Selling
Stockholders (including such holders of Registrable Securities) to a number
deemed satisfactory by such managing underwriter; and provided that the shares
to be excluded shall be determined in the following order of priority: (i)
first, securities held by any Persons not having any such contractual,
incidental registration rights, (ii) second, securities held by any Persons
having contractual, incidental registration rights pursuant to an agreement that
is not this Agreement or the Existing Agreement, (iii) third, Registrable
Securities issued or issuable in respect of Series A Preferred Stock held by the
Investors (such Registrable Securities to be excluded pro rata based on the
number of such Registrable Securities requested to be registered by each
Investor), (iv) fourth, Registrable Securities issued or issuable in respect of
Series B Preferred Stock and Series C Preferred Stock held by the Investors
(such Registrable Securities to be excluded pro rata based on the number of such
Registrable Securities requested to be registered by each Investor); and (v)
fifth, Existing Agreement Registrable Securities held by parties to the Existing
Agreement; provided, further, that in no event shall the amount of Registrable
Securities of the selling Investors to be included in such offering be reduced
below Twenty Percent (20%) of the total amount of securities to be included in
such offering, except that the number of Registrable Securities to be included
by them in such offering may be reduced below twenty percent (20%) of the total
amount of securities to be included in such offering if any managing underwriter
advises as provided above and no other stockholder's securities are included.

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            (f) The Company shall not be obligated to effect, or to take any
action to effect, any registration pursuant to this Section 2.1:

                  (i) After the Company has effected two registrations in the
      aggregate pursuant to this Section 2.1 and such registrations have been
      declared or ordered effective; provided, however, that the Company will
      not be deemed to have effected a registration for purposes of this Section
      2.1(f)(i) so long as the Initiating Holders are unable to sell at least
      Thirty Percent (30%) of the Registrable Securities sought to be included
      in such registration statement;

                  (ii) During the period starting with the effective date of,
      and ending on a date one hundred eighty (180) days after the effective
      date of, a registration subject to Section 2.2 hereof or Section 2.2 of
      the Existing Agreement; or

                  (iii) If the Investors propose to dispose of shares of
      Registrable Securities that may be immediately registered on Form S-3
      pursuant to a request made pursuant to Section 2.9 below.

            (g) The parties hereto acknowledge and agree that it is their
intention to provide Hudson Venture Partners, II, L.P. (including its Permitted
Transferees) (collectively, "Hudson") and Greylock XII Limited Partnership
(including its Permitted Transferees) (collectively, "Greylock") with
registration rights substantially equivalent to the aggregate registration
rights of the other Investors party hereto under both this Agreement and the
Existing Agreement and, to the extent Hudson and Greylock are materially
adversely affected by not being a party to the Existing Agreement (including
without limitation Hudson and Greylock failing to achieve such substantially
equivalent aggregate registration rights), the parties hereto further agree to
take all actions reasonably necessary to provide Hudson and Greylock with such
substantially equivalent registration rights, including reallocating (to the
extent necessary) the Registrable Securities entitled to be sold pursuant to any
registration under the Existing Agreement or this Agreement between or among
Hudson, Greylock and the Investors party hereto and party to the Existing
Agreement such that Hudson and Greylock shall be entitled to participate in any
such registration on a pro-rata basis, based upon the number of Registrable
Securities held by Hudson and Greylock as it relates to the total number of
Registrable Securities (under this Agreement and the Existing Agreement) held by
Hudson, Greylock and the Investors party hereto and party to the Existing
Agreement participating in such registration. To the extent the Company delivers
any notice or other information to the investors under the Existing Agreement,
the Company shall, at the same time, provide Hudson and Greylock with a copy of
such notice or other information. Notwithstanding anything in this Agreement to
the contrary, no amendment or waiver of this Section 2.1(g) shall be made or be
effective without the prior written consent of both Hudson and Greylock.

      2.2 Company Registration.

            (a) If the Company at any time proposes to register (including for
this purpose a registration effected by the Company for stockholders other than
the Holders) any of its stock or other securities under the Securities Act in
connection with the public offering of such securities solely for cash (other
than a Qualified Public Offering or a registration statement

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relating either to the sale of securities to employees of the Company pursuant
to a stock option, stock purchase or similar plan or a SEC Rule 145
transaction), the Company shall, at such time, promptly give each Holder at
least twenty (20) days' written notice of its intention to do so. Upon the
written request of each Holder given within fifteen (15) days after receipt of
such notice by the Holder in accordance with Section 5.7, the Company shall use
its best efforts to cause to be registered under the Securities Act all of the
Registrable Securities that each such Holder has requested to be registered.

            (b) In connection with any offering involving an underwriting of
shares of the Company's capital stock, the Company shall not be required under
this Section 2.2 to include any of the Holders' securities in such underwriting
unless such Holders accept the terms of the underwriting as agreed upon between
the Company and the underwriters selected by the Company (or by other persons
entitled to select the underwriters). If the Company is advised in writing in
good faith by any managing underwriter of the Company's securities being offered
in an underwritten public offering pursuant to such registration statement that
the amount to be sold by Selling Stockholders is greater than the amount which
can be offered without adversely affecting the offering, the Company may reduce
the amount offered for the accounts of Selling Stockholders (including such
Holders of Registrable Securities) to a number deemed satisfactory by such
managing underwriter; provided that the shares to be excluded shall be
determined in the following order of priority: (i) first, securities held by any
Persons not having any such contractual, incidental registration rights, (ii)
second, securities held by any Persons having contractual, incidental
registration rights pursuant to an agreement that is not this Agreement or the
Existing Agreement, (iii) third, Registrable Securities issued or issuable in
respect of Series A Preferred Stock held by the Investors (such Registrable
Securities to be excluded pro rata based on the number of such Registrable
Securities requested to be registered by each Investor), (iv) fourth,
Registrable Securities issued or issuable in respect of Series B Preferred Stock
and Series C Preferred Stock held by the Investors (such Registrable Securities
to be excluded pro rata based on the number of such Registrable Securities
requested to be registered by each Investor); (v) fifth, Existing Agreement
Registrable Securities held by parties to the Existing Agreement; and (vi)
sixth, securities to be registered for the Company's own account.

      2.3 Obligations of the Company. Whenever required under this Section 2 to
effect the registration of any Registrable Securities, the Company shall, as
expeditiously as possible:

            (a) Prepare and file with the SEC, within ninety (90) days of the
receipt of a request pursuant to Section 2.1 or 2.9, a registration statement on
the appropriate form under the Securities Act with respect to such securities,
which form shall comply in all material respects with the requirements of the
SEC, and use its best efforts to cause such registration statement to become and
remain effective until the completion of the proposed offering (but for no more
than one hundred twenty (120) days); provided, however, that (i) such one
hundred twenty (120) day period shall be extended for a period of time equal to
the period the Holder refrains from selling any securities included in such
registration at the request of an underwriter of Common Stock (or other
securities) of the Company; and (ii) in the case of any registration of
Registrable Securities on Form S-3 which are intended to be offered on a
continuous or delayed basis, such one hundred twenty (120) day period shall be
extended, if necessary, to keep the registration statement effective until all
such Registrable Securities are sold, provided that Rule

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415, or any successor rule under the Securities Act, permits an offering on a
continuous or delayed basis, and provided further that applicable rules under
the Securities Act governing the obligation to file a post-effective amendment
permit, in lieu of filing a post-effective amendment which (I) includes any
prospectus required by Section 10(a)(3) of the Securities Act or (II) reflects
facts or events representing a material or fundamental change in the information
set forth in the registration statement, the incorporation by reference of
information required to be included in (I) and (II) above to be contained in
periodic reports filed pursuant to Section 13 or 15(d) of the 1934 Act in the
registration statement;

            (b) Prepare and file with the SEC such amendments and supplements to
such registration statement and the prospectus used in connection with such
registration statement as may be necessary to comply with the provisions of the
Securities Act with respect to the sale or other disposition of all of the
securities covered by such registration statement;

            (c) Furnish to the selling Holders and the underwriters, if any,
such numbers of copies of such registration statement, any amendments thereto,
any documents incorporated by reference therein, the prospectus, including a
preliminary prospectus, in conformity with the requirements of the Securities
Act, and such other documents as they may reasonably request in order to
facilitate the sale or other disposition of the securities owned by them;

            (d) Use its best efforts to register and qualify the securities
covered by such registration statement under such other securities or Blue Sky
laws of such jurisdictions as shall be reasonably requested by the selling
Holders and do any and all other acts and things that may be necessary under
such securities and blue sky laws to enable such selling Holders to consummate
the sale or other disposition of the securities owned by them; provided that the
Company shall not be required in connection therewith or as a condition thereto
to qualify to do business or to file a general consent to service of process in
any such states or jurisdictions, unless the Company is already subject to
service in such jurisdiction and except as may be required by the Securities
Act;

            (e) Within a reasonable time before each filing of the registration
statement or prospectus or amendments or supplements thereto with the SEC,
furnish to the Selling Holders' Counsel copies of such documents proposed to be
filed;

            (f) Promptly notify each selling Holder of Registrable Securities,
the Selling Holders' Counsel and any underwriter and (if requested by any such
Person) confirm such notice in writing, of the happening of any event which
makes any statement made in the registration statement or related prospectus
untrue or which requires the making of any changes in such registration
statement or prospectus so that they will not contain any untrue statement of a
material fact or omit to state any material fact required to be stated therein
or necessary to make the statements therein in the light of the circumstances
under which they were made not misleading; and, as promptly as practicable
thereafter, prepare and file with the SEC and furnish a supplement or amendment
to such prospectus so that, as thereafter deliverable to the purchasers of such
Registrable Securities, such prospectus will not contain any untrue statement of
a material fact or omit to state a material fact necessary to make the
statements therein, in the light of the circumstances under which they were
made, not misleading;

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            (g) Use its commercial best efforts to prevent the issuance of any
order suspending the effectiveness of a registration statement and, if one is
issued, use its commercial best efforts to obtain the withdrawal of any order
suspending the effectiveness of a registration statement at the earliest
possible moment;

            (h) If requested by the managing underwriter or underwriters (if
any), any selling Holder, or the Selling Holders' Counsel, promptly incorporate
in a prospectus supplement or post-effective amendment such information as such
Person requests to be included therein with respect to the selling Holder or the
securities being sold by such Holder, including, without limitation, with
respect to the securities being sold by such selling Holder to such underwriter
or underwriters, the purchase price being paid therefor by such underwriter or
underwriters and with respect to any other terms of an underwritten offering of
the securities to be sold in such offering, and promptly make all required
filings of such prospectus supplement or post-effective amendment;

            (i) Make available to each selling Holder, any underwriter
participating in any disposition pursuant to a registration statement, and any
attorney, accountant or other agent or representative retained by any such
selling Holder or underwriter (collectively, the "Inspectors"), upon request,
all financial and other records, pertinent corporate documents and properties of
the Company (collectively, the "Records"), as shall be reasonably necessary to
enable them to exercise their due diligence responsibility, and cause the
Company's officers, directors and employees to supply all information reasonably
requested by any such Inspector in connection with such registration statement
subject, in each case, to such confidentiality agreements as the Company shall
reasonably request;

            (j) In the event of any underwritten public offering, enter into and
perform its obligations under an underwriting agreement, in usual and customary
form, with the managing underwriter or underwriters of such offering;

            (k) Cause all such Registrable Securities registered pursuant to
such registration statement to be listed on each securities exchange or quoted
on the quotation system on which the Common Stock is then listed or quoted (or
if the Common Stock is not yet listed or quoted, then on such exchange or
quotation system as the selling Holders and the Company shall mutually agree);

            (l) Provide a transfer agent and registrar for all Registrable
Securities registered pursuant hereunder and a CUSIP number for all such
Registrable Securities, in each case not later than the effective date of such
registration;

            (m) Furnish, at the request of any Holder requesting registration of
Registrable Securities pursuant to this Section 2, on the date that such
Registrable Securities are delivered to the underwriters for sale in connection
with a registration pursuant to this Section 2, if such securities are being
sold through underwriters, or, if such securities are not being sold through
underwriters, on the date that the registration statement with respect to such
securities becomes effective, (i) an opinion, dated such date, of the counsel
representing the Company for the purposes of such registration, in form and
substance as is customarily given to underwriters in an underwritten public
offering, addressed to the underwriters, if any, and (ii) a letter dated

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such date, from the independent certified public accountants of the Company, in
form and substance as is customarily given by independent certified public
accountants to underwriters in an underwritten public offering, addressed to the
underwriters, if any;

            (n) Otherwise use its best efforts to comply with all applicable
rules and regulations of the SEC and make generally available to its security
holders, in each case as soon as practicable, but not later than 45 days after
the close of the period covered thereby, an earnings statement of the Company
which will satisfy the provisions of Section 11(a) of the Securities Act and
Rule 158 thereunder (or any comparable successor provisions); and

            (o) Otherwise cooperate with the underwriter(s), the SEC and other
regulatory agencies and take all reasonable actions and execute and deliver or
cause to be executed and delivered all documents reasonably necessary to effect
the registration of any securities under this Agreement.

      2.4 Furnish Information. It shall be a condition precedent to the
obligations of the Company to take any action pursuant to this Section 2 with
respect to the Registrable Securities of any selling Holder that such Holder
shall furnish to the Company such information regarding itself, the Registrable
Securities held by it, and the intended method of disposition of such securities
as shall reasonably be required to effect the registration of such Holder's
Registrable Securities.

      2.5 Expenses of Registration. All expenses other than underwriting
discounts and commissions incurred in connection with registrations, filings or
qualifications pursuant to Section 2.1, Section 2.2 (which right may be assigned
as provided in Section 2.10) or Section 2.9, including (without limitation) all
registration, filing and qualification fees, printers' and accounting fees, fees
and disbursements of counsel for the Company (which counsel shall be reasonably
acceptable to the Investors) and the reasonable fees and disbursements of the
Selling Holders' Counsel shall be borne by the Company.

      2.6 Damages. The Company recognizes and agrees that each holder of
Registrable Securities will not have an adequate remedy if the Company fails to
comply with the terms and provisions of this Agreement and that damages will not
be readily ascertainable, and the Company expressly agrees that, in the event of
such failure, it shall not oppose an application by any holder of Registrable
Securities or any other Person entitled to the benefits of this Agreement
requiring specific performance of any and all provisions hereof or enjoining the
Company from continuing to commit any such breach of this Agreement.

      2.7 Indemnification. In the event any Registrable Securities are included
in a registration statement under this Section 2:

            (a) The Company shall indemnify and hold harmless each selling
Holder, each underwriter (as defined in the Securities Act) and each Person who
participates in the offering of securities under such registration statement,
and each other Person, if any, who controls (within the meaning of the
Securities Act) such seller, underwriter or participating Person (individually
and collectively, the "Indemnified Person"), against any losses, claims, damages
or liabilities (joint or several) to which they may become subject under the
Securities

                                       10

<PAGE>

Act, the 1934 Act or other federal or state law, insofar as such losses, claims,
damages, or liabilities (joint or several), or actions in respect thereof, arise
out of or are based upon: (i) any untrue statement or alleged untrue statement
of a material fact contained in such registration statement, including any
preliminary prospectus or final prospectus contained therein or any amendments
or supplements thereto, (ii) the omission or alleged omission to state therein a
material fact required to be stated therein, or necessary to make the statements
therein not misleading, or (iii) any violation or alleged violation by the
Company of the Securities Act, the 1934 Act, any state securities law or any
rule or regulation promulgated under the Securities Act, the 1934 Act or any
state securities law, and the Company shall pay to each such Indemnified Person,
as incurred, any legal or other expenses reasonably incurred by them in
connection with investigating or defending any such loss, claim, damage,
liability, or action; provided, however, that the Company shall not be liable to
any Indemnified Person in any such case for any such loss, claim, damage,
liability, or action to the extent that it arises out of or is based upon any
untrue statement or alleged untrue statement or omission or alleged omission in
such registration statement, preliminary or final prospectus, or amendment or
supplement thereto in reliance upon and in conformity with written information
furnished to the Company by such Person expressly for use therein.

            (b) Each selling Holder of Registrable Securities included in such
registration being effected shall indemnify and hold harmless the Company, each
of its directors, each of its officers who has signed the registration
statement, each of its agents, each underwriter, any other Holder selling
securities in such registration statement and any Person who controls (within
the meaning of the Securities Act) the Company, such underwriter or such Holder
(individually or collectively, also the "Indemnified Person"), against any
losses, claims, damages, or liabilities (joint or several), or actions in
respect thereof, to which they may become subject, under the Securities Act or
any other statute or at common law, which arise out of or are based upon (i) any
untrue statement or alleged untrue statement of any material fact contained, on
the effective date thereof, in any registration statement under which securities
were registered under the Securities Act, any preliminary prospectus or final
prospectus contained therein, or any amendment or supplement thereto, or (ii)
any omission or alleged omission by such selling Holder to state therein a
material fact required to be stated therein or necessary to make the statements
therein not misleading under the circumstances in which such statements were
made, in the case of (i) and (ii) to the extent, but only to the extent, that
such untrue statement or alleged untrue statement or omission or alleged
omission was made in such registration statement, preliminary or final
prospectus, amendment or supplement thereto in reliance upon and in conformity
with information furnished in writing to the Company by such selling Holder
specifically for use therein, and such selling Holder shall reimburse, as
incurred, any Indemnified Person for any legal fees incurred in investigating or
defending any such liability; provided, however, that such selling Holder's
obligations hereunder shall be limited to an amount equal to the proceeds (net
of underwriting discounts, commissions and expenses) to such selling Holder of
the securities sold in any such registration; and provided further, that no
selling Holder shall be required to indemnify any Person against any liability
arising from any untrue or misleading statement or omission contained in any
preliminary prospectus if such deficiency is corrected in the final prospectus
or for any liability which arises out of the failure of any Person to deliver a
prospectus as required by the Securities Act.

                                       11

<PAGE>

            (c) Promptly after receipt by an indemnified party under this
Section 2.7 of a complaint, claim or notice of the commencement of any liability
or action (including any governmental action), such indemnified party will, if a
claim in respect thereof is to be made against any indemnifying party under this
Section 2.7, promptly notify the indemnifying party of such complaint, claim,
notice or action, and such indemnifying party shall have the right to
investigate and assume the defense thereof with counsel selected by the
indemnifying party and reasonably satisfactory to the indemnified party;
provided, however, that an indemnified party (together with all other
indemnified parties which may be represented without conflict by one counsel)
shall have the right to retain one separate counsel, with the reasonable fees
and expenses to be paid by the indemnifying party, if representation of such
indemnified party by the counsel retained by the indemnifying party would be
inappropriate due to actual or potential conflicts of interest between such
indemnified party and any other party represented by such counsel in such
proceeding. The Person claiming indemnification shall have the right to employ
separate counsel in any such action and to participate in the defense thereof
but the fees and the expenses of such counsel shall not be at the expense of the
Person against whom indemnification is sought (unless the indemnifying party
fails to promptly defend, in which case the reasonable fees and expenses of such
separate counsel shall be borne by the Person against whom indemnification is
sought). The failure to deliver written notice to the indemnifying party within
a reasonable time of the commencement of any such action, if materially
prejudicial to its ability to defend such action, shall relieve such
indemnifying party of any liability to the indemnified party for any losses,
claims, damages or liabilities for which indemnification would otherwise be
available under this Section 2.7, but the omission to so deliver written notice
to the indemnifying party will not relieve it of any liability that it may have
to any indemnified party otherwise than under this Section 2.7. In no event
shall a Person against whom indemnification is sought be obligated to indemnify
any Person for any settlement of any claim or action effected without the
indemnifying Person's prior written consent which shall not be unreasonably
withheld.

            (d) If the indemnification provided for in this Section 2.7 is held
by a court of competent jurisdiction to be unavailable to an indemnified party
with respect to any loss, liability, claim, damage, or expense referred to
therein, then each indemnifying party, in lieu of indemnifying such indemnified
party hereunder, shall contribute to the amount paid or payable by such
indemnified party as a result of such loss, liability, claim, damage, or expense
(i) in such proportion as is appropriate to reflect the relative fault of the
Company, the selling Holders of Registrable Securities, the other Selling
Stockholders and the underwriters in connection with the statements or omissions
which resulted in such losses, claims, damages, expenses or liabilities or (ii)
if the allocation provided by clause (i) above is not permitted by applicable
law, in such proportion as is appropriate to reflect not only the relative fault
referred to in clause (i) above but also the relative benefits received by the
Company, the selling Holders of Registrable Securities, the other Selling
Stockholders and the underwriters from the offering of Registrable Securities,
as well as any other relevant equitable considerations. The relative benefits
received by the Company, the selling Holders of Registrable Securities, the
other Selling Stockholders and the underwriters shall be deemed to be in the
same respective proportions that the proceeds or commissions from the offering
received by the Company, the selling Holders of Registrable Securities, the
other Selling Stockholders and the underwriters, in each case as set forth in
the table on the cover page of the applicable prospectus, bear to the aggregate
public offering price of the Registrable Securities. The relative fault of the
Company, the selling Holders of Registrable Securities, the other Selling
Stockholders and the underwriters shall be determined

                                       12

<PAGE>

by reference to, among other things, whether the untrue or alleged untrue
statement of a material fact or the omission or alleged omission to state a
material fact relates to information supplied by the Company, the selling
Holders of Registrable Securities, the other Selling Stockholders or the
underwriters and the parties' relative intent, knowledge, access to information
and opportunity to correct or prevent such statement or omission.

            The Company and the selling Holders of Registrable Securities agree
that it would not be just and equitable if contribution pursuant to this Section
2.7 were determined solely by pro rata or per capita allocation or by any other
method of allocation which does not take account of the equitable considerations
referred to in the immediately preceding paragraph. In no event, however, shall
a selling Holder be required to contribute any amount under this Section 2.7 in
excess of the proceeds (net of underwriting discounts, commissions and expenses)
received by such selling Holder from its sale of Registrable Securities under
such registration statement. No person found guilty of fraudulent
misrepresentation (within the meaning of Section 11(f) of the Securities Act)
shall be entitled to contribution from any person who was not found guilty of
such fraudulent misrepresentation.

            (e) The obligations of the Company and selling Holders under this
Section 2.7 shall survive the completion of any offering of Registrable
Securities in a registration statement under this Section 2 and the termination
of this Agreement.

      2.8 Reports Under Securities Exchange Act of 1934. With a view to making
available to the Holders the benefits of Rule 144 promulgated under the
Securities Act (and any successor rule) ("SEC Rule 144") and any other rule or
regulation of the SEC that may at any time permit a Holder to sell securities of
the Company to the public without registration or pursuant to a registration on
Form S-3, the Company agrees to:

            (a) make and keep public information available, as those terms are
understood and defined in SEC Rule 144, at all times after ninety (90) days
after the effective date of the first registration statement filed by the
Company for the offering of its securities to the general public, and take all
reasonable action as may be required as a condition to the availability of SEC
Rule 144;

            (b) take such action, including the voluntary registration of its
Common Stock under Section 12 of the 1934 Act, as is necessary to enable the
Holders to utilize Form S-3 for the sale of their Registrable Securities, such
action to be taken as soon as practicable after the end of the fiscal year in
which the first registration statement filed by the Company for the offering of
its securities to the general public is declared effective, and to maintain such
status;

            (c) file with the SEC in a timely manner all reports and other
documents required of the Company under the Securities Act and the 1934 Act and
make such other filings and take such other actions required of the issuer to
effect sales of Registrable Securities in reliance upon SEC Rule 144;

            (d) furnish to any Holder, so long as the Holder owns any
Registrable Securities, forthwith upon request (i) a written statement by the
Company that it has complied with the reporting requirements of SEC Rule 144 (at
any time after ninety (90) days after the

                                       13

<PAGE>

effective date of the first registration statement filed by the Company), the
Securities Act and the 1934 Act (at any time after it has become subject to such
reporting requirements), or that it qualifies as a registrant whose securities
may be resold pursuant to Form S-3 (at any time after it so qualifies), (ii) a
copy of the most recent annual or quarterly report of the Company and such other
reports and documents so filed by the Company, and (iii) such other information
as may be reasonably requested in availing any Holder of any rule or regulation
of the SEC which permits the selling of any such securities without registration
or pursuant to such form; and

            (e) facilitate and expedite transfers of Registrable Securities
pursuant to SEC Rule 144, including providing timely notice to its transfer
agent to expedite such transfers.

      2.9 Form S-3 Registration. After the initial public offering of its
securities registered under the Securities Act, the Company shall use its
commercially reasonable efforts to qualify and remain qualified to register
securities on Form S-3 (or any successor form) under the Securities Act. In case
the Company shall receive from any Investor or Investors (as defined herein or
in the Existing Agreement) a written request or requests that the Company effect
a registration on Form S-3 and any related qualification or compliance with
respect to all or a part of the Registrable Securities held by such Investor or
Investors, the Company will:

            (a) promptly give at least twenty (20) days' written notice of the
proposed registration, and any related qualification or compliance, to all other
Holders; and

            (b) as soon as practicable, effect such registration and all such
qualifications and compliances as may be so requested and as would permit or
facilitate the sale and distribution of all or such portion of the Investor's or
Investors' Registrable Securities as are specified in such request, together
with all or such portion of the Registrable Securities of any other Holder or
Holders (as defined herein or in the Existing Agreement) joining in such request
as are specified in a written request given within fifteen (15) days after
receipt of such written notice from the Company; provided, however, that the
Company shall not be obligated to effect any such registration, qualification or
compliance, pursuant to this Section 2.9: (1) if Form S-3 is not available for
such offering by the Investors; (2) if the Investors, together with the holders
of any other securities of the Company entitled to inclusion in such
registration, propose to sell Registrable Securities and such other securities
(if any) at an aggregate price to the public of less than One Million Dollars
($1,000,000); (3) if the Company shall furnish to the Investors a certificate
signed by the Chief Executive Officer of the Company stating that in the good
faith judgment of the Board of Directors, it would be materially detrimental to
the Company and its stockholders for such Form S-3 Registration to be effected
at such time, in which event the Company shall have the right to defer the
filing of the Form S-3 registration statement for a period of not more than
ninety (90) days after receipt of the request of Holders under this Section 2.9;
provided, however, that the Company shall not utilize this right more than once
in any twelve (12) month period; (4) if the Company has, within the twelve (12)
month period preceding the date of such request, already effected in the
aggregate two (2) registrations on Form S-3 for the Investors pursuant to this
Section 2.9 and/or for the Investors as defined in, and pursuant to Section 2.9
of, the Existing Agreement; (5) if the Company has already effected in the
aggregate a total of four (4) registrations on Form S-3 for Investors pursuant
to this Section 2.9 and/or for the Investors as defined in, and pursuant to
Section 2.9 of, the Existing Agreement; (6) if, at the time of its written
request pursuant to this Section 2.9, Investors

                                       14

<PAGE>

beneficially own less than Twenty Percent (20%) of the aggregate Registrable
Securities beneficially owned by them as of the Second Closing, or if there is
no Second Closing, as of the date hereof (as adjusted for stock dividends,
combinations, splits, recapitalizations and the like); or (7) in any particular
jurisdiction in which the Company would be required to qualify to do business or
to execute a general consent to service of process in effecting such
registration, qualification or compliance.

            (c) Subject to the foregoing, the Company shall file a registration
statement covering the Registrable Securities and other securities so requested
to be registered as soon as practicable after receipt of the request or requests
of the Investors. Registrations effected pursuant to this Section 2.9 shall not
be counted as demands for registration or registrations effected pursuant to
Sections 2.1 or 2.2, respectively.

      2.10 Assignment of Registration Rights. The rights to cause the Company to
register Registrable Securities pursuant to this Section 2 may be assigned (but
only with all related obligations) by a Holder to a Permitted Transferee of such
Registrable Securities, provided that: (a) the Company is, within a reasonable
time after such transfer, furnished with written notice of the name and address
of such transferee or assignee and the securities with respect to which such
registration rights are being assigned; and (b) such transferee or assignee
agrees in writing to be bound by and subject to the terms and conditions of this
Agreement, including without limitation the provisions of Section 2.12 below.

      2.11 Limitations on Subsequent Registration Rights. From and after the
date of this Agreement, the Company shall not, without the prior written consent
of the Investors holding a majority of the outstanding Registrable Securities
held by the Investors, (a) allow purchasers of the Company's securities to
become a party to this Agreement, except as contemplated by Section 5.9 below,
or (b) grant any other registration rights to any third parties other than
subordinate piggyback registration rights.

      2.12 "Market Stand-Off" Agreement. Each Investor hereby agrees that,
during the ninety (90) day period following the date of the first sale to the
public pursuant to a registration statement of the Company filed under the
Securities Act, it shall not, to the extent requested by the Company and the
underwriter of such registration, directly or indirectly sell, offer to sell,
contract to sell (including, without limitation, any short sale), grant any
option to purchase or otherwise transfer or dispose of (other than to donees who
agree to be similarly bound) any securities of the Company held by it at any
time during such period except Common Stock included in such registration;
provided, however, that:

            (a) such agreement shall be applicable only (i) to the first such
registration statement of the Company which covers Common Stock to be sold on
its behalf to the public in an underwritten offering; and (ii) so long as the
Investors continue to own Twenty Percent (20%) or more of the outstanding equity
securities of the Company, to any subsequent registration statement of the
Company which covers Common Stock to be sold on its behalf to the public in an
underwritten offering;

                                       15

<PAGE>

            (b) officers and directors of the Company, all holders of more than
Five Percent (5%) of the outstanding capital stock of the Company, and all other
persons with registration rights (whether or not pursuant to this Agreement)
enter into similar agreements; and

            (c) such market stand-off time period shall not exceed ninety (90)
days.

      In order to enforce the foregoing covenant, the Company may impose
stop-transfer instructions with respect to the Registrable Securities of the
Investors (and the shares or securities of every other person subject to the
foregoing restriction) until the end of such period. Notwithstanding the
foregoing, the obligations described in this Section 2.12 shall not apply to a
registration relating solely to employee benefit plans on Form S-8 or similar
forms which may be promulgated in the future, or a registration relating solely
to a SEC Rule 145 transaction on Form S-4 or similar forms which may be
promulgated in the future.

      2.13 Obligations of the Holders. All selling Holders proposing to
distribute their securities through an underwritten offering shall (together
with the Company as provided in Section 2.3(j)) enter into an underwriting
agreement in customary form with the underwriter or underwriters selected for
such underwriting. All selling Holders proposing to distribute their securities
through an offering pursuant to this Section 2 shall enter into such agreements
and shall execute such other documents in customary form as may reasonably be
requested by the Company or, in the event of an underwritten offering, by any
managing underwriter.

      3. COVENANTS OF THE COMPANY.

      The Company agrees for the benefit of the Investors that it shall comply
with the following covenants, provided that the covenants set forth in Section
3.2 shall not be in effect during any period in which the Company is subject to
the periodic reporting obligations set forth in Section 13(a) or Section 15(d)
of the 1934 Act and that all of the covenants set forth in this Section 3 shall
terminate as of the closing of (a) a Qualified Public Offering or (b) a sale of
all or substantially all of the assets or business of the Company, whether by
merger, sale of assets, change of voting control, or otherwise, or on the date
specified by written consent of the holders of Fifty and One-Tenth percent
(50.1%) of the voting power of all then-outstanding shares of Series B Preferred
Stock and Series C Preferred Stock (voting together as a single class).

      3.1 Pre-emptive Rights. So long as any shares of Preferred Stock are
outstanding, the Company hereby grants the Holders certain pre-emptive rights
with respect to future sales of equity securities by the Company. The Company
agrees that it will not sell or issue any shares of, or securities convertible
into or exercisable for any shares of, any class of its capital stock
("Securities"), unless the Company shall first submit a written offering of all
such Securities to the Holders in accordance with the following provisions:

            (1) The Company shall deliver a notice ("Offer Notice") to each
Holder stating (i) that the Company is offering such Securities, (ii) the number
of such Securities to be offered, and (iii) the price and material terms, if
any, upon which it proposes to offer such Securities, and offering the Holders
the opportunity to purchase its Pro Rata Share of the Securities on terms and
conditions, including price, not less favorable than those on which the Company
proposes to sell such Securities to a third party or parties.

                                       16

<PAGE>

            (2) Within ten (10) days after the date of the Offer Notice, each
Holder may elect to purchase or obtain, at the price and on the terms and
conditions specified in the Offer Notice, up to its Pro Rata Share of such
Securities. Within ten (10) days after expiration of such period, the Company
shall provide written notice (an "Undersubscription Notice") to each Holder who
elected to purchase all the Securities available to it pursuant to the preceding
sentence (each a "Fully Exercising Stockholder") of all other Holders' failure
to do likewise and offering the unsubscribed shares to the Fully Exercising
Stockholder in accordance with this Section 3.1(2). Within ten (10) days after
the Undersubscription Notice (the "Second Subscription Period"), each Fully
Exercising Stockholder shall notify the Company in writing if it wishes to
obtain that portion of the Securities not subscribed for by the other Holder
which is equal to the proportion that the number of Shares held by such Fully
Exercising Stockholder as of the date of the Offer Notice bears to the total
number of Shares held by all Fully Exercising Stockholders who wish to purchase
some of the unsubscribed Securities. Each Holder acknowledges and agrees that
any failure to notify the Company within the applicable time periods specified
above shall be deemed a waiver of such Holder's rights to participate in the
applicable offering.

            (3) If the Holders do not elect to purchase all Securities referred
to in the Offer Notice at the end of the Second Subscription Period, the Company
may, during the ninety (90) day period following the Second Subscription Period,
offer the remaining unsubscribed portion of such Securities to any person or
persons at a price not less than, and upon terms and conditions no more
favorable to the offeree than those specified in the Offer Notice. If the
Company does not enter into an agreement for the sale of the Securities within
such period, or if such agreement is not consummated within three (3) months of
the execution thereof, the right provided hereunder shall be deemed to be
revived and such Shares shall not be offered unless first re-offered to the
Holders in accordance herewith.

            (4) The pre-emptive rights in this Section 3.1 shall not be
applicable (i) to the issuance of up to 4,311,041 shares of Common Stock
(including the grant of options therefor and the issuance or sale of shares or
grants prior to the date hereof) to officers, directors, employees, advisors and
consultants of the Company pursuant to the Company's 1999 Stock Option/Stock
Issuance Plan (the "Stock Plan") or any other stock or option plan approved by
the unanimous consent of the Compensation Committee of the Company's Board of
Directors, or such greater number of shares as is approved by the Company's
Board of Directors (including at least a majority of the Investors' Nominees),
(ii) with respect to, or after consummation of, a Qualified Public Offering,
(iii) to the issuance of securities pursuant to the conversion or exercise of
convertible or exercisable securities outstanding on the date hereof, (iv) to
the issuance of not more than 691,552 shares of Common Stock (or an equivalent
amount of securities convertible or exercisable to or for Common Stock), in the
aggregate (as adjusted for stock splits, stock dividends, stock combinations and
similar events), to financial institutions or lessors in connection with
obtaining commercial credit, equipment financings or similar transactions, (v)
to the issuance of securities as consideration in a bona fide acquisition of or
by the Company, whether by merger, consolidation, sale of assets, sale or
exchange of stock or otherwise, unanimously approved by the Board of Directors,
or (vi) to the issuance of up to 164,302 shares of Series C Preferred Stock at
the Second Closing (as defined in the Purchase Agreement).

                                       17

<PAGE>

      3.2 Delivery of Financial Statements. The Company will maintain a
comparative system of accounts in accordance with generally accepted accounting
principles, keep full and complete financial records and furnish to the
Investors the following reports:

            (a) as soon as available and within ninety (90) days after the end
of each fiscal year commencing with the year ending December 31, 2005, a copy of
the balance sheet of the Company as of the end of such year, together with
statements of income and retained earnings and cash flow of the Company for such
year, audited and reported on by independent public accountants of recognized
national standing reasonably satisfactory to the Board of Directors, prepared in
accordance with generally accepted accounting principles and practices
consistently applied;

            (b) as soon as available and in any event within forty-five (45)
days after the end of each quarter of each fiscal year commencing with the
quarter ending March 31, 2006, a copy of the balance sheet of the Company as of
the end of such quarter, together with statements of income and retained
earnings and cash flow of the Company for the period commencing at the end of
the previous fiscal quarter and ending with the end of such fiscal quarter, such
balance sheets, statements of income and retained earnings and cash flows
setting forth in comparative form the corresponding figures for the
corresponding fiscal period in the prior fiscal year, all in reasonable detail
and certified (subject to year-end audit adjustments) by the chief financial
officer of the Company as having been prepared in a manner consistent with
generally accepted accounting principles and practices consistently applied; and

            (c) as soon as available and in any event within thirty (30) days
after the end of each month commencing with the month ending April 30, 2006, an
unaudited balance sheet of the Company as of the end of such month and unaudited
statements of income and retained earnings and cash flow for the Company for
such month; and

            (d) such other information relating to the financial condition,
business, prospects or results of operations as the Investors may reasonably
request, including, without limitation, certificates of the principal financial
officer of the Company concerning compliance with the covenants of the Company
under this Section 3.2.

      3.3 Budget and Operating Forecast; Inspection.

            (a) The Company will prepare and submit to the Board of Directors a
budget for the Company for each fiscal year of the Company at least thirty (30)
days prior to the beginning of such fiscal year. The budget shall be accepted as
the budget for such fiscal year when it has been approved by a majority of the
Board of Directors and, thereupon, a copy of such budget promptly shall be sent
to each Investor. The Company shall review the budget periodically and shall
advise the Board of Directors and the Investors of all material changes therein
and all material deviations therefrom.

            (b) The Company will, upon reasonable prior notice to the Company,
permit authorized representatives (including, without limitation, accountants
and legal counsel) of any Investor, at the Investor's expense, to visit and
inspect any of the properties of the Company, including its books of account
(and to make copies thereof and take extracts

                                       18

<PAGE>

therefrom), and to discuss its affairs, finances and accounts with its officers,
administrative employees and independent accountants, all at such reasonable
times during normal business hours and as often as may be reasonably requested
by any Investor; provided, that in the event any person exercising such
inspection rights shall be someone other than an Investors' Nominee or a
director designated by the Investors, the Company may, as a condition to the
exercise of such visitation or inspection rights, require such person to execute
a standard form non-disclosure agreement in form and substance satisfactory to
the Company.

      3.4 Board of Directors; Meetings; Indemnification. The Company will ensure
that meetings of its Board of Directors are held at least six (6) times each
year at intervals of not more than two (2) months. The Company shall reimburse
each Investors' Nominee for reasonable travel expenses incurred in connection
with attending meetings or other functions of the Board of Directors and for the
Investors' Nominees' reasonable out-of-pocket costs associated with any other
work performed at the request of, and on behalf of, the Company. The Charter and
By-laws of the Company will in respect of all times during which any Investors'
Nominee serves as a director of the Company provide for exculpation and
indemnification of the directors and limitations on the liability of the
directors to the fullest extent permitted under applicable state law. The
Company shall maintain directors and officers' liability insurance coverage in
such form and amount from such insurance carrier as shall be reasonably
satisfactory to the Investors, and shall use its best efforts to obtain, prior
to an initial public offering of the Company's securities, additional directors
and officers' liability insurance coverage to include claims under the
Securities Act and the 1934 Act.

      3.5 Observation. For a period of two years following the date of this
Agreement, the Company will permit each of Hudson Venture Partners II, L.P. and
Longworth Venture Partners, L.P., or any authorized representative thereof, for
as long as they shall hold any Preferred Stock, to attend all meetings of the
Board of Directors of the Company, and shall provide such person with such
notice and other information with respect to such meetings as are delivered to
the directors of the Company. Notwithstanding the foregoing, the Company (i) may
condition the right of any such person to attend meetings of the Board of
Directors and receive notice and other information with respect to such meetings
on the execution of a confidentiality agreement reasonably acceptable to the
Company, and (ii) may prevent such person from attending a Board of Directors
meeting (or portion thereof) or receiving certain information with respect
thereto if the Company believes, after consultation with counsel, that it is
necessary to do so to ensure preservation of the attorney-client privilege.

      3.6 Composition of Board Committees. The Company agrees to cause the Board
of Directors to maintain a Compensation Committee (which shall be charged with
exclusive authority over all compensation matters with respect to the senior
management of the Company and shall, together with the Chief Executive Officer,
serve as the administering committee under the Stock Plan) and an Audit
Committee (which shall be charged with reviewing the Company's financial
statements and accounting practices). Each such committee shall consist of
non-management directors. Each of Morgan Stanley Dean Witter Venture Partners
IV, L.P., Commonwealth Capital Ventures II L.P. and Greylock XII Limited
Partnership shall be entitled to nominate at least one (1) representative to
each such committee and to any other committee formed by the Company.

                                       19

<PAGE>

      3.7 Positive Covenants. So long as any shares of the Series B Preferred
Stock or Series C Preferred Stock are outstanding, the Company agrees, for the
benefit of the holders of the Company's Series B Preferred Stock and Series C
Preferred Stock, as follows:

            (a) The Company will continue to engage principally in the business
now conducted by the Company or a business or businesses substantially similar
thereto. The Company will keep in full force and effect its corporate existence
and all Intellectual Property Rights useful in its business (except such rights
as the Board of Directors has reasonably determined are not material to the
continuing operations of the Company);

            (b) The Company will promptly advise the Investors of any event
which represents or is reasonably likely to result in a material adverse effect
on the Company's business, properties, assets, prospects, results of operations
or financial condition (a "Material Adverse Effect"), and of each suit or
proceeding commenced or threatened against the Company which, if adversely
determined, is reasonably likely to have a Material Adverse Effect, other than
events, developments, suits or proceedings which could reasonably be expected to
equally affect all companies within the same or a similar industry. The Company
will promptly advise the Investors of any adverse developments relating to the
Company's products or services, and any suit or proceeding commenced or
threatened which is related to the Company's products or services which, if
adversely determined, in the reasonable judgment of the Company, is reasonably
likely to have a Material Adverse Effect, other than suits or proceedings which
could reasonably be expected to equally affect all companies within the same or
a similar industry;

            (c) The compensation and other benefit arrangements of any senior
management of the Company shall be adjusted from time to time only by the
Compensation Committee, unless the Compensation Committee determines otherwise;

            (d) All transactions by and between the Company and any officer or
key employee of the Company or persons controlling, controlled by, under common
control with or otherwise affiliated with or members of the families of such
officer or key employee (including compensation matters covered by Section
3.7(c) hereof), shall be conducted on an arm's-length basis, shall be on terms
and conditions no less favorable to the Company than could be obtained from
unrelated persons and shall be approved in advance by a majority of the Board of
Directors after full disclosure of the terms thereof;

            (e) The Company shall maintain in full force and effect its
corporate existence, rights, and franchises and all licenses and other rights to
use patents, processes, licenses, trademarks, trade names, or copyrights owned
or possessed by it or any subsidiary and deemed by the Company to be necessary
to the conduct of its business;

            (f) The Company will retain independent public accountants of
recognized national standing who shall certify the Company's financial
statements at the end of each fiscal year. In the event the services of the
Company's independent public accountants, or any firm of independent public
accountants hereafter employed by the Company are terminated, the Company will
promptly thereafter notify the Investors and will request the firm of
independent public accountants whose services are terminated to deliver to the
Investors a letter from such firm setting forth the reasons for the termination
of their services. In the event of such

                                       20

<PAGE>

termination, the Company will promptly thereafter engage another firm of
independent public accountants of recognized national standing. In its notice to
the Investors the Company shall state whether the change of accountants was
recommended or approved by the Board of Directors or any committee thereof;

            (g) The Company will cause each person now or hereafter employed by
it or any subsidiary with access to confidential information to enter into a
proprietary information and inventions agreement substantially in the form
approved by the Board of Directors; and

            (h) The Company will use its best efforts to comply with the
reporting and recordkeeping requirements of Section 1202 of the Internal Revenue
Code of 1986, as amended, any regulations promulgated thereunder and any similar
state laws and regulations, and agrees not to repurchase any stock of the
Company if such repurchase would cause the shares of Common Stock (including the
Common Stock issuable or issued upon conversion of the Preferred Stock),
Preferred Stock and any other equity securities now of hereafter issued by the
Company, together with any options thereon and any other shares of stock issued
or issuable with respect thereto (whether by way of a stock dividend, stock
split or in exchange for or upon conversion of such shares or otherwise in
connection with a combination of shares, recapitalization, merger, consolidation
or other corporate reorganization) not to so qualify as "Qualified Small
Business Stock." The Company further covenants to submit to its stockholders and
to state and federal taxation authorities such form and filings as may be
required to document such compliance, with its franchise or income tax return
for the current income year.

      4. VOTING RESTRICTIONS.

            (a) Each of the Common Holders and Investors agrees to vote all of
its shares of the Company's capital stock having voting power (and any other
shares over which it exercises voting control) in connection with the election
of directors and to take such other actions as are necessary so as to fix the
number of directors at no more than seven (7) and to elect and continue in
office as directors the following:

            (i) one (1) director designated by Morgan Stanley Dean Witter
      Venture Partners IV, L.P. ("MSDWVP"), who shall initially be Patrick
      Gallagher, one (1) director designated by Commonwealth Capital Ventures II
      L.P., who shall initially be Michael T. Fitzgerald, one (1) director
      designated by Greylock XII Limited Partnership, who shall initially be
      William S. Kaiser, and the Chief Executive Officer of the Company; and

            (ii) three (3) outside directors recruited by the Chief Executive
      Officer of the Company, designated by the holders of the Common Stock,
      voting as a separate class, and approved by a majority of the Investors'
      Nominees, two of whom shall initially be John Campbell and Paul Schaut.

            (b) Each Investor and each Common Holder agrees that it shall vote
all of its shares of the Company's Common Stock and Preferred Stock in
connection with the election of directors and to take such other actions as are
necessary so as to elect the outside directors designated pursuant to Section
4(a)(ii) above.

                                       21

<PAGE>

            (c) Each of the parties to this Agreement agrees to vote all of its
shares of the Company's capital stock having voting power (and any other shares
over which it exercises voting control) for the removal of any director upon the
request of the party designating such director and for the election to the Board
of Directors of a substitute designated by such party in accordance with the
provisions of this Section 4. Each of the parties to this Agreement further
agrees to vote all of its shares of the Company's capital stock having voting
power (and any other shares over which it exercises voting control) in such
manner as shall be necessary or appropriate to ensure that any vacancy on the
Board of Directors of the Company occurring for any reason shall be filled only
in accordance with the provisions of this Section 4.

            (d) None of the Company, the Common Holders nor the Investors nor
any officer, director, shareholder, employee or agent of such party, if any, by
virtue of such party's execution of this Agreement or by the act of nominating a
nominee or voting for such nominee pursuant to this Section 4, makes any
representation or warranty as to the fitness or competence of the nominee of any
party hereunder to serve on the Board of Directors.

            (e) The provisions of this Section 4 shall terminate upon the
earliest to occur of the following: (i) the closing of a Qualified Public
Offering; (ii) the effective time of the sale of all or substantially all of the
assets of the Company; and (iii) the effective time of the sale of all or
substantially all of the capital stock of the Company, by way of merger or
otherwise (excluding merger the sole purpose of which is to reincorporate the
Company in a different jurisdiction).

      5. MISCELLANEOUS.

      5.1 Survival of Covenants. Each of the parties hereto agrees that each
covenant and agreement made by it in this Agreement or in any certificate,
instrument or other document delivered pursuant to this Agreement is material,
shall be deemed to have been relied upon by the other parties and, except as
provided herein, shall remain operative and in full force and effect after the
date hereof regardless of any investigation. This Agreement shall not be
construed so as to confer any right or benefit upon any Person other than the
parties hereto and their respective successors and permitted assigns to the
extent contemplated herein.

      5.2 Legend on Securities. The Company and the Investors acknowledge and
agree that the legends substantially as follows, as well as any legend required
pursuant to the Purchase Agreement, shall be typed on each certificate
evidencing any of the securities issued hereunder held at any time by any of the
Common Holders, the Investors or their Permitted Transferees.

      THE SECURITIES REPRESENTED HEREBY ARE SUBJECT TO THE PROVISIONS OF A
      PREFERRED INVESTORS' RIGHTS AGREEMENT, AS AMENDED AND IN EFFECT FROM TIME
      TO TIME, INCLUDING THEREIN CERTAIN VOTING AGREEMENTS. COMPLETE AND CORRECT
      COPIES OF THIS AGREEMENT ARE AVAILABLE FOR INSPECTION AT THE PRINCIPAL
      OFFICE OF THE COMPANY AND WILL BE FURNISHED UPON WRITTEN REQUEST AND
      WITHOUT CHARGE.

                                       22

<PAGE>

      5.3 Successors and Assigns. Except as otherwise provided herein, the terms
and conditions of this Agreement shall inure to the benefit of and be binding
upon the respective successors and assigns of the parties (including the
Permitted Transferees). Nothing in this Agreement, express or implied, is
intended to confer upon any party other than the parties hereto or their
respective successors and assigns any rights, remedies, obligations, or
liabilities under or by reason of this Agreement, except as expressly provided
in this Agreement.

      5.4 Governing Law. This Agreement shall be governed by and construed under
the laws of the State of Delaware, exclusive of the provisions thereof governing
conflicts of laws.

      5.5 Counterparts. This Agreement may be executed in any number of
counterparts, each of which shall be deemed an original, but all of which
together shall constitute one and the same instrument.

      5.6 Titles and Subtitles; Gender. The titles and subtitles used in this
Agreement are used for convenience only and are not to be considered in
construing or interpreting this Agreement. The use in this Agreement of the
masculine pronoun in reference to a party hereto shall be deemed to include the
feminine member, and vice versa as the context may require.

      5.7 Notices. All notices and other communications provided for herein
shall be in writing and shall be deemed to have been duly given, delivered and
received (i) if delivered personally or (ii) when sent by confirmed electronic
mail or facsimile if sent during normal business hours of the recipient (and if
not, then on the next business day), or (iii) if sent by registered or certified
mail (return receipt requested) postage prepaid, or by courier guaranteeing next
day delivery, in each case to the party to whom it is directed at the following
addresses (or at such other address for any party as shall be specified by
notice given in accordance with the provisions hereof, provided that notices of
a change of address shall be effective only upon receipt thereof). Notices
delivered personally shall be effective on the day so delivered, notices sent by
registered or certified mail shall be effective three days after mailing,
notices sent by facsimile shall be effective when receipt is acknowledged, and
notices sent by courier guaranteeing next day delivery shall be effective on the
earlier of the second business day after timely delivery to the courier or the
day of actual delivery by the courier:

            (a) if to the Company, at the mailing address for the Company shown
on the signature pages hereto, Attention: CEO, with a copy to Gesmer Updegrove,
LLP, 40 Broad Street, Boston, Massachusetts 02109 (facsimile: 617-350-6878),
Attention: Thomas H. Durkin, Esq., or such other address designated by the
Company to the Investors and the other parties hereto in writing;

            (b) if to the Investors, to each Investor at the mailing address as
shown on the signature pages hereto, with a copy to Gunderson Dettmer Stough
Villeneuve Franklin & Hachigian, LLP, 220 W. 42nd St., 20th Floor| New York, NY
10036, (facsimile: 877-881-3007), Attention: Kenneth R. McVay, Esq. and to
Wilmer Cutler Pickering Hale and Dorr LLP, 60 State Street, Boston,
Massachusetts 02109, (facsimile: 617-526-5000), Attention: Mark G. Borden, Esq.,
or at such other address designated by an Investor to the Company and the other
Investors in writing.

                                       23

<PAGE>

      5.8 Expenses. If any action at law or in equity is necessary to enforce or
interpret the terms of this Agreement, the prevailing party shall be entitled to
reasonable attorneys' fees, costs and necessary disbursements in addition to any
other relief to which such party may be entitled.

      5.9 Amendments and Waivers. Any term of this Agreement may be amended and
the observance of any term of this Agreement may be waived (either generally or
in a particular instance and either retroactively or prospectively), only with
the written consent of the Company and the holders of at least Fifty and One
Tenth percent (50.1%) of the Registrable Securities issued or issuable upon
conversion of the Series B Preferred Stock and Series C Preferred Stock held by
all Investors; provided, however, that any amendment to Section 3.5 or Section 4
above that would adversely effect the right of a particular Investor to
designate a board observer or a member of the Board of Directors (including
Greylock, MSDWVP and Commonwealth Capital Ventures II L.P.) shall require the
consent of such Investor. Any amendment or waiver effected in accordance with
this paragraph shall be binding upon each holder of any securities purchased
under the Purchase Agreement then outstanding, each future holder of all such
securities, and the Company. Notwithstanding anything in this Agreement to the
contrary, no amendment to or waiver of Section 5.11, 5.12 or 5.13 shall be made
or be effective without the prior written consent of both Hudson and Greylock.
Notwithstanding the foregoing, the Company may amend Schedule A without the
consent of any other party hereto to reflect the addition of parties pursuant to
Section 5.10 below.

      5.10 Additional Parties. Additional parties may be added as Investors
after the date hereof by (i) the execution and delivery of a counterpart to this
Agreement by such additional party, and (ii) the acceptance (by countersigning
and delivery) thereof by the Company, but only if such additional party is an
"Investor" as defined under the Purchase Agreement. In addition, the Company
shall require that any party to which it issues voting securities in the future,
as condition precedent to such issuance, sign an instrument of accession to this
Agreement by which such party agrees to be bound as a "Common Holder" or
"Investor", as applicable, hereunder with respect to the voting obligations
described in Section 4 above; provided, however, securities issued in connection
with an issuance of a type described in Section 3.1(4) above shall not be
subject to the foregoing requirement unless such issuance would result in the
stockholders bound by Section 4 above holding less than a majority of the shares
of any class or series of the Company's voting securities.

      5.11 Potential Conflict with the Existing Agreement. The parties hereto
acknowledge and agree that if any of the rights or benefits contemplated for
Greylock under Section 4 above (relating to Greylock's right to designate one
member to the Company's Board of Directors) are not or cannot be achieved due to
a conflict with the Existing Agreement or the Amended and Restated Stock
Restriction Agreement dated August 9, 2001 among the Company and the parties
named therein (as such agreement may be further amended and in effect from time
to time, the "Existing Stock Restriction Agreement") or due to the fact that the
Existing Agreement or the Existing Stock Restriction Agreement is unable to be
amended to take into account such rights, the parties hereto agree to take all
action reasonably necessary to provide Greylock with such rights, including, if
applicable, adjusting its rights such that Greylock will each achieve the rights
contemplated hereunder.

                                       24

<PAGE>

      5.12 Existing Stock Restriction Agreement. The parties hereto agree to
take all actions reasonably necessary to provide Hudson and Greylock with rights
of first refusal and rights of co-sale substantially equivalent to the rights of
the other Investors party both hereto and to the Existing Stock Restriction
Agreement under Section 2.2 and Section 2.3 of the Existing Stock Restriction
Agreement, including, if necessary and to the extent not deemed a violation of
the Existing Stock Restriction Agreement, reallocating the shares of capital
stock purchasable pursuant to such Section 2.2 or entitled to be sold pursuant
to such Section 2.3 between or among Hudson, Greylock and the Investors party
both hereto and to the Existing Stock Restriction Agreement, with respect to
each such party, based on the number of shares of capital stock of the Company
held by such party and the number of shares of capital stock of the Company held
by Hudson, Greylock and the Investors party both hereto and to the Existing
Stock Restriction Agreement participating in such purchase or sale. To the
extent the Company or any other party delivers any notice or other information
to the investors under the Existing Stock Restriction Agreement, the Company or,
in the case of a notice received from another party, such investors shall, at
the same time, provide Hudson and Greylock with a copy of such notice or other
information.

      5.13 Amendments to Existing Agreement and Existing Stock Restriction
Agreement.

            (a) To the extent the parties hereafter amend either the Existing
Agreement or the Existing Stock Restriction Agreement, the parties shall use all
reasonable efforts to cause Hudson and Greylock to become parties to each such
agreement and to provide Hudson and Greylock with all the benefits and rights to
which it would be entitled thereunder as contemplated hereunder (including any
additional rights that may hereafter be granted under either such agreement to
the other Investors as a class).

            (b) Notwithstanding anything else contained in this Agreement, if
for any reason Hudson and Greylock are not able to enjoy all rights and benefits
to which each of them would have been entitled had it been a party to the
Existing Agreement or the Existing Stock Restriction Agreement as an "Investor"
thereunder, then the parties to those agreements that are also parties to this
Agreement shall take all actions reasonably necessary to provide to Hudson and
Greylock such rights and benefits as if they each were a party to such other
agreements.

      5.14 Severability. If one or more provisions of this Agreement are held to
be unenforceable under applicable law, such provision shall be excluded from
this Agreement and the balance of the Agreement shall be interpreted as if such
provision were so excluded and shall be enforceable in accordance with its
terms.

      5.15 Aggregation of Stock. All shares of Preferred Stock held or acquired
by affiliated entities or persons shall be aggregated together for the purpose
of determining the availability of any rights under this Agreement.

      5.16 Entire Agreement. This Agreement and the documents referred to herein
constitute the entire agreement among the parties with regard to the subjects
hereof and thereof.

                                       25

<PAGE>

      5.17 Consent Under Existing Agreement. By their signatures below, the
Existing Investors hereby consent to the Company's extension of the registration
rights described in this Agreement to the Investors party hereto. Hudson Venture
Partners, II, L.P. and Longworth Venture Partners, L.P. each consents to the
amendment of Section 4 of the Current Agreement and further acknowledges and
agrees that upon effectiveness of this Agreement, each shall no longer have any
right to designate a member of the Company's board of directors, as provided
under Sections 4(b) and 4(a)(i) respectively of the Current Agreement.

                                       26

<PAGE>

            IN WITNESS WHEREOF, the parties have caused this Amended and
Restated Investors' Rights Agreement to be duly executed and delivered as of the
date first above written.

                         THE COMPANY:

                              ROVING SOFTWARE INCORPORATED

                              By: /s/ Gail F. Goodman
                                  ------------------------------------------
                                  Name: Gail F. Goodman
                                  Title: President & Chief Executive Officer

                              Address:   Reservoir Place, Suite 329
                                         1601 Trapelo Road
                                         Waltham, MA 02451
                              Facsimile: (781) 472-8101

                         THE INVESTORS:

                              MORGAN STANLEY DEAN WITTER
                              VENTURE PARTNERS IV, L.P.
                              MORGAN STANLEY DEAN WITTER
                              VENTURE INVESTORS IV, L.P.
                              MORGAN STANLEY DEAN WITTER
                              VENTURE OFFSHORE INVESTORS IV, L.P.

                              By: MSDW Venture Partners IV, LLC,
                                  as General Partner of each of the limited
                                  partnerships named above

                              By: MSDW Venture Partners IV, Inc.,
                                  as Member

                              By: /s/ Debra Abramovich
                                  ------------------------------------------
                                  Name:  Debra Abramovich
                                  Title: Executive Director

                              Address:   1585 Broadway
                                         38th Floor
                                         New York, NY  10036
                              Facsimile: (212) 762-8424

<PAGE>

                         THE INVESTORS:

                              COMMONWEALTH CAPITAL VENTURES II L.P.
                              CCV II ASSOCIATES L.P.

                              By: Commonwealth Venture Partners II L.P., as
                                  General Partner of each of the limited
                                  partnerships named above

                              By: /s/ Michael T. Fitzgerald
                                  ------------------------------------------
                                  Name:
                                  Title: General Partner

                              Address:   950 Winter Street
                                         Suite 4100
                                         Waltham, MA  02451
                              Facsimile: (781) 890-5554

                              LONGWORTH VENTURE PARTNERS, L.P.

                              By: Longworth Venture Management LLC,
                                  its sole General Partner

                              By: /s/ James J. Savage
                                  ------------------------------------------
                                  Name:  James J. Savage
                                  Title: Manager

                              Address:   1050 Winter Street, Suite 2600
                                         Waltham, MA  02451
                              Facsimile: (781) 663-3619

                              HUDSON VENTURE PARTNERS II, L.P.

                              By: Hudson Ventures II, L.L.C.,
                                  its General Partner

                              By: /s/ Jay N. Goldberg
                                  ------------------------------------------
                                  Name:  Jay N. Goldberg
                                  Title: Senior Managing Director

                              Address:   535 Fifth Avenue, 14th Floor
                                         New York, NY  10017
                              Facsimile: (212) 644-7430

<PAGE>

                              GREYLOCK XII LIMITED PARTNERSHIP

                              By: Greylock XII GP LLC, its General Partner

                              By: /s/ Donald A. Sullivan
                                  ------------------------------------------
                                  Name:  Donald A. Sullivan
                                  Title: Administrative Partner

                              Address:   880 Winter Street
                                         Suite 300
                                         Waltham, MA 02451
                              Facsimile: (781) 622-2300

                              GREYLOCK XII-A LIMITED PARTNERSHIP

                              By: Greylock XII GP LLC, its General Partner

                              By: /s/ Donald A. Sullivan
                                  ------------------------------------------
                                 Name:  Donald A. Sullivan
                                  Title: Administrative Partner

                              Address:   880 Winter Street
                                         Suite 300
                                         Waltham, MA 02451
                              Facsimile: (781) 622-2300

                              GREYLOCK XII PRINCIPALS LLC

                              By: Greylock Management Corporation, Sole Member

                              By: /s/ Donald A. Sullivan
                                  ------------------------------------------
                                  Name:  Donald A. Sullivan
                                  Title: Treasurer

                              Address:   880 Winter Street
                                         Suite 300
                                         Waltham, MA 02451
                              Facsimile: (781) 622-2300

<PAGE>

                              BANTAM GROUP INC.

                              By: __________________________________________
                                  Name:
                                  Title:

                              Address:   50 Bay Colony Drive
                                         Westwood, MA  02090
                              Facsimile:

                              ______________________________________________
                              K. Tucker Anderson

                              Address:   61 Above All Road
                                         Warren, CT  06754-1710
                              Facsimile:

                              ______________________________________________
                              Frank Argano

                              Address:   3543 Washington Blvd.
                                         Jersey City, NJ  07310
                              Facsimile:

                              ______________________________________________
                              John Beard

                              Address:   Ropes & Gray
                                         One International Place
                                         Boston, MA  02110
                              Facsimile:

                              ______________________________________________
                              Michael Mark

                              Address:   284 Summer Street
                                         Reading, MA  01867
                              Facsimile:

<PAGE>

                              ______________________________________________
                              Leon C. Sunstein, Jr.

                              Address:   1617 JFK Blvd., #335
                                         Philadelphia, PA  19103
                              Facsimile:

<PAGE>

                              ONE & CO.

                              By: __________________________________________
                                  Name:
                                  Title:

                              Address:   c/o Welch & Forbes
                                         45 School Street
                                         Boston, MA  02108
                              Facsimile:

                              LONGWORTH cAPITAL, LLC

                              By: __________________________________________
                                  Name:
                                  Title:

                              Address:   1050 Winter Street, Suite 2600
                                         Waltham, MA  02451
                              Facsimile:

                              ______________________________________________
                              John Campbell

                              Address:   P.O. Box 74
                                         12 Briarwood Lane
                                         Monument Beach, MA  02553
                              Facsimile:

                              ______________________________________________
                              Barry Coffman

                              Address:   c/o Boldwater Capital
                                         101 Federal Street
                                         Boston, MA  02110
                              Facsimile:

<PAGE>

                              Scott G. Coffman Irrevocable Trust

                              By: __________________________________________
                                  Name:
                                  Trustee

                              Address:

                              Facsimile:

                              David R. Coffman Irrevocable Trust

                              By: __________________________________________
                                  Name:
                                  Trustee

                              Address:

                              Facsimile:

                              Alexandra B. Coffman Irrevocable Trust

                              By: __________________________________________
                                  Name:
                                  Trustee

                              Address:

                              Facsimile:

                              ______________________________________________
                              Richard Connolly

                              Address:   c/o Paine Webber
                                         265 Franklin Street
                                         Boston, MA  02110
                              Facsimile:

<PAGE>

                              ______________________________________________
                              Michael DelBlasio

                              Address:   59 Park Drive South
                                         Rye, NY  10580
                              Facsimile:

                              ______________________________________________
                              David D. Holbrook

                              Address:   42 Downing Street
                                         New York, NY  10014
                              Facsimile:

                              ______________________________________________
                              Steve Lesser

                              Address:   47 Claypit Hill Road
                                         Wayland, MA  01778
                              Facsimile:

                              ______________________________________________
                              Harold L. Osher

                              Address:   66 Chadwick Street
                                         Portland, ME  04102
                              Facsimile: 207-773-5220

                              ______________________________________________
                              Peggy L. Osher

                              Address:   66 Chadwick Street
                                         Portland, ME  04102
                              Facsimile: 207-773-5220

                              ______________________________________________
                              James Philip

                              Address:   70 Shaw Road
                                         Chestnut Hill, MA  02467
                              Facsimile:

<PAGE>

                              ______________________________________________
                              Kermit Stofer

                              Address:   10 Post Office Square, Suite 600
                                         Boston, MA  02109
                              Facsimile:

                              ______________________________________________
                              William Volkmann

                              Address:   69 Hampshire Road
                                         Wellesley, MA  02481
                              Facsimile:

<PAGE>

                         OTHER INVESTORS:

                                         _______________________________________
                                         Name:

                                         Address:

                                         Facsimile:

<PAGE>

                          THE COMMON HOLDERS:

      Solely with respect to Section 4 hereof

                                           /s/ Gail F. Goodman
                                         -----------------------------------
                                         Gail F. Goodman

                                           /s/ Eric Groves
                                         -----------------------------------
                                         Eric Groves

                                           /s/ Steven Wasserman
                                         -----------------------------------
                                         Steven Wasserman

<PAGE>

                                   SCHEDULE A

                                    INVESTORS

Morgan Stanley Dean Witter Venture Partners IV, L.P.

Morgan Stanley Dean Witter Venture Investors IV, L.P.

Morgan Stanley Dean Witter Venture Offshore Investors IV, L.P.

Commonwealth Capital Ventures II L.P.

CCV II Associates L.P.

Longworth Venture Partners, L.P.

Hudson Venture Partners II, L.P.

Greylock XII Limited Partnership

Greylock XII-A Limited Partnership

Greylock XII Principals LLC

Michael Mark

Leon C. Sunstein, Jr.

Frank Argano

Bantam Group Inc.

K. Tucker Andersen

John Beard

One & Co.

Barry Coffman

Scott G. Coffman Irrevocable Trust

David R. Coffman Irrevocable Trust

Alexandra B. Coffman Irrevocable Trust

Michael DelBlasio

William Volkmann

Richard Connolly

Alan Frohman

David D. Holbrook

Peggy Osher

Harold Osher

Longworth Capital, LLC

Steve Lesser

Kermit Stofer

<PAGE>

James Philip

John Campbell

<PAGE>

           AMENDED AND RESTATED PREFERRED INVESTORS' RIGHTS AGREEMENT

                           COUNTERPART SIGNATURE PAGE

      Pursuant to Section 1.1(c) of the Amended and Restated Preferred
Investors' Rights Agreement dated May 12, 2006 (the "Agreement") by and among
the Company and the Investors listed on Schedule A thereto and in consideration
of the sale and issuance of shares of the Company's Series C Preferred Stock to
the undersigned, the undersigned hereby agrees to be bound by and to observe all
of the terms and conditions of the Agreement, all of the benefits, restrictions
and obligations of the Agreement shall inure to the undersigned as an Investor
thereunder and the undersigned shall be deemed an Investor for all purposes
thereof. The undersigned hereby authorizes the Company to attach this
counterpart signature page to the Agreement. Capitalized terms used but not
defined herein shell have the meanings ascribed thereto in the Agreement.

      IN WITNESS WHEREOF, the undersigned has executed this Counterpart
Signature Page as of the 19th day of May, 2006.

INVESTOR:

John Campbell / Jean Campbell
--------------------------------------------
           (Name of Investor)

By: /s/ John Campbell /s/ Jean Campbell
    ----------------------------------------
                  (signature)

Name: ______________________________________
Title: _____________________________________

Accepted and agreed to this 19th day of May, 2006:

ROVING SOFTWARE INCORPORATED

By: /s/ Steven R. Wasserman
    ----------------------------------------
                  (signature)

Name: STEVEN R. WASSERMAN
Title: VP and CFO

<PAGE>

           AMENDED AND RESTATED PREFERRED INVESTORS' RIGHTS AGREEMENT

                           COUNTERPART SIGNATURE PAGE

      Pursuant to Section 1.1(c) of the Amended and Restated Preferred
Investors' Rights Agreement dated May 12, 2006 (the "Agreement") by and among
the Company and the Investors listed on Schedule A thereto and in consideration
of the sale and issuance of shares of the Company's Series C Preferred Stock to
the undersigned, the undersigned hereby agrees to be bound by and to observe all
of the terms and conditions of the Agreement, all of the benefits, restrictions
and obligations of the Agreement shall inure to the undersigned as an Investor
thereunder and the undersigned shall be deemed an Investor for all purposes
thereof. The undersigned hereby authorizes the Company to attach this
counterpart signature page to the Agreement. Capitalized terms used but not
defined herein shell have the meanings ascribed thereto in the Agreement.

      IN WITNESS WHEREOF, the undersigned has executed this Counterpart
Signature Page as of the ___ day of __________, 2006.

INVESTOR:

           Barry Coffman
--------------------------------------------
         (Name of Investor)

By: /s/ Barry Coffman
    ----------------------------------------
                  (signature)

Name: ______________________________________
Title: _____________________________________

Accepted and agreed to this ___ day of _________ , 2006:

ROVING SOFTWARE INCORPORATED

By: /s/ Steven R. Wasserman
    ----------------------------------------
                  (signature)

Name:  STEVEN R. WASSERMAN
Title: VP & CFO

<PAGE>

           AMENDED AND RESTATED PREFERRED INVESTORS' RIGHTS AGREEMENT

                           COUNTERPART SIGNATURE PAGE

      Pursuant to Section 1.1(c) of the Amended and Restated Preferred
Investors' Rights Agreement dated May 12, 2006 (the "Agreement") by and among
the Company and the Investors listed on Schedule A thereto and in consideration
of the sale and issuance of shares of the Company's Series C Preferred Stock to
the undersigned, the undersigned hereby agrees to be bound by and to observe all
of the terms and conditions of the Agreement, all of the benefits, restrictions
and obligations of the Agreement shall inure to the undersigned as an Investor
thereunder and the undersigned shall be deemed an Investor for all purposes
thereof. The undersigned hereby authorizes the Company to attach this
counterpart signature page to the Agreement. Capitalized terms used but not
defined herein shell have the meanings ascribed thereto in the Agreement.

      IN WITNESS WHEREOF, the undersigned has executed this Counterpart
Signature Page as of the ___ day of __________, 2006.

INVESTOR:

    Scott G. Coffman Irrevocable Trust
--------------------------------------------
            (Name of Investor)

By: /s/ Linda C. Coffman
    ----------------------------------------
                  (signature)

Name:  Linda C. Coffman
Title: Trustee

Accepted and agreed to this 1 day of June, 2006:

ROVING SOFTWARE INCORPORATED

By: /s/ Steven R. Wasserman
    ----------------------------------------
                  (signature)

Name:  STEVEN R. WASSERMAN
Title: VP & CFO

<PAGE>

           AMENDED AND RESTATED PREFERRED INVESTORS' RIGHTS AGREEMENT

                           COUNTERPART SIGNATURE PAGE

      Pursuant to Section 1.1(c) of the Amended and Restated Preferred
Investors' Rights Agreement dated May 12, 2006 (the "Agreement") by and among
the Company and the Investors listed on Schedule A thereto and in consideration
of the sale and issuance of shares of the Company's Series C Preferred Stock to
the undersigned, the undersigned hereby agrees to be bound by and to observe all
of the terms and conditions of the Agreement, all of the benefits, restrictions
and obligations of the Agreement shall inure to the undersigned as an Investor
thereunder and the undersigned shall be deemed an Investor for all purposes
thereof. The undersigned hereby authorizes the Company to attach this
counterpart signature page to the Agreement. Capitalized terms used but not
defined herein shell have the meanings ascribed thereto in the Agreement.

      IN WITNESS WHEREOF, the undersigned has executed this Counterpart
Signature Page as of the ___ day of __________, 2006.

INVESTOR:

       Alexandra Irrevocable Trust
--------------------------------------------
           (Name of Investor)

By: /s/ Barry Coffman
    ----------------------------------------
                  (signature)

Name:  Barry Coffman
Title: Trustee

Accepted and agreed to this ___ day of _________ , 2006:

ROVING SOFTWARE INCORPORATED

By: /s/ Steven R. Wasserman
    ----------------------------------------
                  (signature)

Name:  STEVEN R. WASSERMAN
Title: VP & CFO

<PAGE>

           AMENDED AND RESTATED PREFERRED INVESTORS' RIGHTS AGREEMENT

                           COUNTERPART SIGNATURE PAGE

      Pursuant to Section 1.1(c) of the Amended and Restated Preferred
Investors' Rights Agreement dated May 12, 2006 (the "Agreement") by and among
the Company and the Investors listed on Schedule A thereto and in consideration
of the sale and issuance of shares of the Company's Series C Preferred Stock to
the undersigned, the undersigned hereby agrees to be bound by and to observe all
of the terms and conditions of the Agreement, all of the benefits, restrictions
and obligations of the Agreement shall inure to the undersigned as an Investor
thereunder and the undersigned shall be deemed an Investor for all purposes
thereof. The undersigned hereby authorizes the Company to attach this
counterpart signature page to the Agreement. Capitalized terms used but not
defined herein shell have the meanings ascribed thereto in the Agreement.

      IN WITNESS WHEREOF, the undersigned has executed this Counterpart
Signature Page as of the ___ day of __________, 2006.

INVESTOR:

     David A. Coffman Irrevocable Trust
--------------------------------------------
             (Name of Investor)

By: /s/ Linda C. Coffman
    ----------------------------------------
                  (signature)

Name:  Linda C. Coffman
Title: Trustee

Accepted and agreed to this 1 day of June, 2006:

ROVING SOFTWARE INCORPORATED

By: /s/ Steven R. Wasserman
    ----------------------------------------
                  (signature)

Name:  STEVEN R. WASSERMAN
Title: VP & CFO

<PAGE>

           AMENDED AND RESTATED PREFERRED INVESTORS' RIGHTS AGREEMENT

                           COUNTERPART SIGNATURE PAGE

      Pursuant to Section 1.1(c) of the Amended and Restated Preferred
Investors' Rights Agreement dated May 12, 2006 (the "Agreement") by and among
the Company and the Investors listed on Schedule A thereto and in consideration
of the sale and issuance of shares of the Company's Series C Preferred Stock to
the undersigned, the undersigned hereby agrees to be bound by and to observe all
of the terms and conditions of the Agreement, all of the benefits, restrictions
and obligations of the Agreement shall inure to the undersigned as an Investor
thereunder and the undersigned shall be deemed an Investor for all purposes
thereof. The undersigned hereby authorizes the Company to attach this
counterpart signature page to the Agreement. Capitalized terms used but not
defined herein shell have the meanings ascribed thereto in the Agreement.

      IN WITNESS WHEREOF, the undersigned has executed this Counterpart
Signature Page as of the 30 day of May, 2006.

INVESTOR:

            Alan L. Frohman
--------------------------------------------
           (Name of Investor)

By: /s/ Alan L. Frohman
    ----------------------------------------
                  (signature)

Name: ___________________
Title:  ____________

Accepted and agreed to this ___ day of __________, 2006:

ROVING SOFTWARE INCORPORATED

By: /s/ Steven R. Wasserman
    ----------------------------------------
                  (signature)

Name:  STEVEN R. WASSERMAN
Title: VP & CFO

<PAGE>

           AMENDED AND RESTATED PREFERRED INVESTORS' RIGHTS AGREEMENT

                           COUNTERPART SIGNATURE PAGE

      Pursuant to Section 1.1(c) of the Amended and Restated Preferred
Investors' Rights Agreement dated May 12, 2006 (the "Agreement") by and among
the Company and the Investors listed on Schedule A thereto and in consideration
of the sale and issuance of shares of the Company's Series C Preferred Stock to
the undersigned, the undersigned hereby agrees to be bound by and to observe all
of the terms and conditions of the Agreement, all of the benefits, restrictions
and obligations of the Agreement shall inure to the undersigned as an Investor
thereunder and the undersigned shall be deemed an Investor for all purposes
thereof. The undersigned hereby authorizes the Company to attach this
counterpart signature page to the Agreement. Capitalized terms used but not
defined herein shell have the meanings ascribed thereto in the Agreement.

      IN WITNESS WHEREOF, the undersigned has executed this Counterpart
Signature Page as of the 1 day of JUNE, 2006.

INVESTOR:

           David D. Holbrook
--------------------------------------------
           (Name of Investor)

By: /s/ David D. Holbrook
    ----------------------------------------
                  (signature)

Name:  DAVID D. HOLBROOK
Title: INVESTOR

Accepted and agreed to this ___ day of __________, 2006:

ROVING SOFTWARE INCORPORATED

By: /s/ Steven R. Wasserman
    ----------------------------------------
                  (signature)

Name:  STEVEN R. WASSERMAN
Title: VP & CFO

<PAGE>

           AMENDED AND RESTATED PREFERRED INVESTORS' RIGHTS AGREEMENT

                           COUNTERPART SIGNATURE PAGE

      Pursuant to Section 1.1(c) of the Amended and Restated Preferred
Investors' Rights Agreement dated May 12, 2006 (the "Agreement") by and among
the Company and the Investors listed on Schedule A thereto and in consideration
of the sale and issuance of shares of the Company's Series C Preferred Stock to
the undersigned, the undersigned hereby agrees to be bound by and to observe all
of the terms and conditions of the Agreement, all of the benefits, restrictions
and obligations of the Agreement shall inure to the undersigned as an Investor
thereunder and the undersigned shall be deemed an Investor for all purposes
thereof. The undersigned hereby authorizes the Company to attach this
counterpart signature page to the Agreement. Capitalized terms used but not
defined herein shell have the meanings ascribed thereto in the Agreement.

      IN WITNESS WHEREOF, the undersigned has executed this Counterpart
Signature Page as of the 22nd day of May, 2006.

INVESTOR:

         Longworth Capital LLC
--------------------------------------------
           (Name of Investor)

By: /s/ Paul A. Margolis
    ----------------------------------------
                  (signature)

Name:  Paul A. Margolis
Title: Manager

Accepted and agreed to this ___ day of __________, 2006:

ROVING SOFTWARE INCORPORATED

By: /s/ Steven R. Wasserman
    ----------------------------------------
                  (signature)

Name:  STEVEN R. WASSERMAN
Title: VP & CFO

<PAGE>

           AMENDED AND RESTATED PREFERRED INVESTORS' RIGHTS AGREEMENT

                           COUNTERPART SIGNATURE PAGE

      Pursuant to Section 1.1(c) of the Amended and Restated Preferred
Investors' Rights Agreement dated May 12, 2006 (the "Agreement") by and among
the Company and the Investors listed on Schedule A thereto and in consideration
of the sale and issuance of shares of the Company's Series C Preferred Stock to
the undersigned, the undersigned hereby agrees to be bound by and to observe all
of the terms and conditions of the Agreement, all of the benefits, restrictions
and obligations of the Agreement shall inure to the undersigned as an Investor
thereunder and the undersigned shall be deemed an Investor for all purposes
thereof. The undersigned hereby authorizes the Company to attach this
counterpart signature page to the Agreement. Capitalized terms used but not
defined herein shell have the meanings ascribed thereto in the Agreement.

      IN WITNESS WHEREOF, the undersigned has executed this Counterpart
Signature Page as of the ___ day of __________, 2006.

INVESTOR:

             Michael Mark
--------------------------------------------
          (Name of Investor)

By: /s/ Michael Mark
    ----------------------------------------
                  (signature)

Name: ______________________________________
Title: _____________________________________

Accepted and agreed to this ___ day of __________, 2006:

ROVING SOFTWARE INCORPORATED

By: /s/ Steven R. Wasserman
    ----------------------------------------
                  (signature)

Name:  STEVEN R. WASSERMAN
Title: VP & CFO

<PAGE>

           AMENDED AND RESTATED PREFERRED INVESTORS' RIGHTS AGREEMENT

                           COUNTERPART SIGNATURE PAGE

      Pursuant to Section 1.1(c) of the Amended and Restated Preferred
Investors' Rights Agreement dated May 12, 2006 (the "Agreement") by and among
the Company and the Investors listed on Schedule A thereto and in consideration
of the sale and issuance of shares of the Company's Series C Preferred Stock to
the undersigned, the undersigned hereby agrees to be bound by and to observe all
of the terms and conditions of the Agreement, all of the benefits, restrictions
and obligations of the Agreement shall inure to the undersigned as an Investor
thereunder and the undersigned shall be deemed an Investor for all purposes
thereof. The undersigned hereby authorizes the Company to attach this
counterpart signature page to the Agreement. Capitalized terms used but not
defined herein shell have the meanings ascribed thereto in the Agreement.

      IN WITNESS WHEREOF, the undersigned has executed this Counterpart
Signature Page as of the 14th day of June, 2006.

INVESTOR:

                ONE & CO
--------------------------------------------
           (Name of Investor)

By: /s/ Benjamin J. Williams, Jr.
    ----------------------------------------
                  (signature)

Name:  Benjamin J. Williams, Jr.
Title: Senior Vice President

Accepted and agreed to this ___ day of __________, 2006:

ROVING SOFTWARE INCORPORATED

By: /s/ Steven R. Wasserman
    ----------------------------------------
                  (signature)

Name:  STEVEN R. WASSERMAN
Title: VP & CFO

<PAGE>

           AMENDED AND RESTATED PREFERRED INVESTORS' RIGHTS AGREEMENT

                           COUNTERPART SIGNATURE PAGE

      Pursuant to Section 1.1(c) of the Amended and Restated Preferred
Investors' Rights Agreement dated May 12, 2006 (the "Agreement") by and among
the Company and the Investors listed on Schedule A thereto and in consideration
of the sale and issuance of shares of the Company's Series C Preferred Stock to
the undersigned, the undersigned hereby agrees to be bound by and to observe all
of the terms and conditions of the Agreement, all of the benefits, restrictions
and obligations of the Agreement shall inure to the undersigned as an Investor
thereunder and the undersigned shall be deemed an Investor for all purposes
thereof. The undersigned hereby authorizes the Company to attach this
counterpart signature page to the Agreement. Capitalized terms used but not
defined herein shell have the meanings ascribed thereto in the Agreement.

      IN WITNESS WHEREOF, the undersigned has executed this Counterpart
Signature Page as of the 26th day of May, 2006.

INVESTOR:

             HAROLD L. OSHER
--------------------------------------------
            (Name of Investor)

By: /s/ Harold L. Osher
    ----------------------------------------
                  (signature)

Name: ______________________________________
Title: _____________________________________

Accepted and agreed to this ___ day of __________, 2006:

ROVING SOFTWARE INCORPORATED

By: /s/ Steven R. Wasserman
    ----------------------------------------
                  (signature)

Name:  STEVEN R. WASSERMAN
Title: VP & CFO

<PAGE>

           AMENDED AND RESTATED PREFERRED INVESTORS' RIGHTS AGREEMENT

                           COUNTERPART SIGNATURE PAGE

      Pursuant to Section 1.1(c) of the Amended and Restated Preferred
Investors' Rights Agreement dated May 12, 2006 (the "Agreement") by and among
the Company and the Investors listed on Schedule A thereto and in consideration
of the sale and issuance of shares of the Company's Series C Preferred Stock to
the undersigned, the undersigned hereby agrees to be bound by and to observe all
of the terms and conditions of the Agreement, all of the benefits, restrictions
and obligations of the Agreement shall inure to the undersigned as an Investor
thereunder and the undersigned shall be deemed an Investor for all purposes
thereof. The undersigned hereby authorizes the Company to attach this
counterpart signature page to the Agreement. Capitalized terms used but not
defined herein shell have the meanings ascribed thereto in the Agreement.

      IN WITNESS WHEREOF, the undersigned has executed this Counterpart
Signature Page as of the 26th day of May, 2006.

INVESTOR:

            PEGGY L. OSHER
--------------------------------------------
          (Name of Investor)

By: /s/ Peggy L. Osher
    ----------------------------------------
                  (signature)

Name: ______________________________________
Title: _____________________________________

Accepted and agreed to this ___ day of __________, 2006:

ROVING SOFTWARE INCORPORATED

By: /s/ Steven R. Wasserman
    ----------------------------------------
                  (signature)

Name:  STEVEN R. WASSERMAN
Title: VP & CFO

<PAGE>

           AMENDED AND RESTATED PREFERRED INVESTORS' RIGHTS AGREEMENT

                           COUNTERPART SIGNATURE PAGE

      Pursuant to Section 1.1(c) of the Amended and Restated Preferred
Investors' Rights Agreement dated May 12, 2006 (the "Agreement") by and among
the Company and the Investors listed on Schedule A thereto and in consideration
of the sale and issuance of shares of the Company's Series C Preferred Stock to
the undersigned, the undersigned hereby agrees to be bound by and to observe all
of the terms and conditions of the Agreement, all of the benefits, restrictions
and obligations of the Agreement shall inure to the undersigned as an Investor
thereunder and the undersigned shall be deemed an Investor for all purposes
thereof. The undersigned hereby authorizes the Company to attach this
counterpart signature page to the Agreement. Capitalized terms used but not
defined herein shell have the meanings ascribed thereto in the Agreement.

      IN WITNESS WHEREOF, the undersigned has executed this Counterpart
Signature Page as of the 27 day of May, 2006.

INVESTOR:

____________________________________________
            (Name of Investor)

By: /s/ James H. Philip
    ----------------------------------------
                  (signature)

Name:  James H. Philip
Title: _____________________________________

Accepted and agreed to this ___ day of __________, 2006:

ROVING SOFTWARE INCORPORATED

By: /s/ Steven R. Wasserman
    ----------------------------------------
                  (signature)

Name:  STEVEN R. WASSERMAN
Title: VP & CFO

<PAGE>

           AMENDED AND RESTATED PREFERRED INVESTORS' RIGHTS AGREEMENT

                           COUNTERPART SIGNATURE PAGE

      Pursuant to Section 1.1(c) of the Amended and Restated Preferred
Investors' Rights Agreement dated May 12, 2006 (the "Agreement") by and among
the Company and the Investors listed on Schedule A thereto and in consideration
of the sale and issuance of shares of the Company's Series C Preferred Stock to
the undersigned, the undersigned hereby agrees to be bound by and to observe all
of the terms and conditions of the Agreement, all of the benefits, restrictions
and obligations of the Agreement shall inure to the undersigned as an Investor
thereunder and the undersigned shall be deemed an Investor for all purposes
thereof. The undersigned hereby authorizes the Company to attach this
counterpart signature page to the Agreement. Capitalized terms used but not
defined herein shell have the meanings ascribed thereto in the Agreement.

      IN WITNESS WHEREOF, the undersigned has executed this Counterpart
Signature Page as of the 28 day of May, 2006.

INVESTOR:

           William H. Volkmann
--------------------------------------------
            (Name of Investor)

By: /s/ William H. Volkmann
    ----------------------------------------
                  (signature)

Name: ______________________________________
Title: _____________________________________

Accepted and agreed to this ___ day of __________, 2006:

ROVING SOFTWARE INCORPORATED

By: /s/ Steven R. Wasserman
    ----------------------------------------
                  (signature)

Name:  STEVEN R. WASSERMAN
Title: VP & CFO

<PAGE>

           AMENDED AND RESTATED PREFERRED INVESTORS' RIGHTS AGREEMENT

                           COUNTERPART SIGNATURE PAGE

      Pursuant to Section 1.1(c) of the Amended and Restated Preferred
Investors' Rights Agreement dated May 12, 2006 (the "Agreement") by and among
the Company and the Investors listed on Schedule A thereto and in consideration
of the sale and issuance of shares of the Company's Series C Preferred Stock to
the undersigned, the undersigned hereby agrees to be bound by and to observe all
of the terms and conditions of the Agreement, all of the benefits, restrictions
and obligations of the Agreement shall inure to the undersigned as an Investor
thereunder and the undersigned shall be deemed an Investor for all purposes
thereof. The undersigned hereby authorizes the Company to attach this
counterpart signature page to the Agreement. Capitalized terms used but not
defined herein shell have the meanings ascribed thereto in the Agreement.

      IN WITNESS WHEREOF, the undersigned has executed this Counterpart
Signature Page as of the 23 day of May, 2006.

INVESTOR:

            Bantam Group Inc.
--------------------------------------------
           (Name of Investor)

By: /s/ J. J. Caruso
    ----------------------------------------
                  (signature)

                  Name:  J. J. Caruso
                  Title: President

Accepted and agreed to this ___ day of __________, 2006:

ROVING SOFTWARE INCORPORATED

By: /s/ Steven R. Wasserman
    ----------------------------------------
                  (signature)

                  Name:  STEVEN R. WASSERMAN
Title: VP & CFO<PAGE>

                                                                   EXHIBIT 10.16

                               RESERVOIR PLACE II
                             WALTHAM, MASSACHUSETTS

                                      LEASE

     THIS INSTRUMENT IS AN INDENTURE OF LEASE in which the Landlord and the
Tenant are the parties hereinafter named, and which relates to space in a
certain building (the "Building") known as Reservoir Place II and with an
address at 1601 Trapelo Road, Waltham, Massachusetts.

     The parties to this Indenture of Lease hereby agree with each other as
follows:

                                   ARTICLE I

                                 REFERENCE DATA

1.1 Subjects Referred To:

     Each reference in this Lease to any of the following subjects shall be
construed to incorporate the data stated for that subject in this Article:

DATE OF LEASE:                           July 9, 2002

LANDLORD:                                Boston Properties Limited Partnership,
                                         a Delaware limited partnership; the
                                         general partner of which is Boston
                                         Properties, Inc., a Delaware
                                         corporation

LANDLORD'S ORIGINAL ADDRESS:             c/o Boston Properties, Inc.
                                         111 Huntington Avenue - Suite 300
                                         Boston, Massachusetts 02199-7610

TENANT:                                  Roving Software Incorporated, a
                                         Delaware corporation

TENANT'S ORIGINAL ADDRESS:               117 Kendrick Street, Suite 400
                                         Needham, Massachusetts 02494
                                         Attn:  Gail Goodman

LANDLORD'S CONSTRUCTION REPRESENTATIVE:  Mark Denman

TENANT'S CONSTRUCTION REPRESENTATIVE:    Dmitry Manilov

                                      -1-
<PAGE>

OUTSIDE COMPLETION DATE FOR PHASE I      July 22, 2002
CONSTRUCTION:

OUTSIDE COMPLETION DATE FOR PHASE II     September 15, 2002
CONSTRUCTION:

ESTIMATED COMMENCEMENT DATE:             July 12, 2002

RENT COMMENCEMENT DATE:                  The Commencement Date

TERM OR LEASE TERM (SOMETIMES CALLED     Thirty-six (36) calendar months (plus
THE ORIGINAL TERM):                      the partial month, if any,
                                         immediately following the Commencement
                                         Date), unless extended or sooner
                                         terminated as provided in this Lease.

EXTENSION OPTION:                        One (1) period of two (2) years, as
                                         provided in and on the terms set forth
                                         in Section 8.20 hereof.

THE SITE:                                That certain parcel of land located on
                                         Trapelo Road, Waltham, Middlesex
                                         County, Massachusetts, being more
                                         particularly described in Exhibit A
                                         attached hereto.

THE BUILDING:                            The Building known as Reservoir Place
                                         II, and numbered 1601 Trapelo Road,
                                         Waltham, Massachusetts, located on the
                                         site and containing the Total Rentable
                                         Floor Area set forth below.

THE ADDITIONAL BUILDING:                 The other Building known as Reservoir
                                         Place I located on the Site and
                                         containing the Total Rentable Floor
                                         Area set forth below.

THE BUILDINGS:                           The Building and the Additional
                                         Building.

THE COMPLEX:                             The Building and the Additional
                                         Building together with all parking
                                         areas, garage, and structures and the
                                         Site.

                                      -2-
<PAGE>

TENANT'S SPACE:                          A portion of the second (2nd) floor of
                                         the Building in accordance with the
                                         floor plan annexed hereto as Exhibit D
                                         and incorporated herein by reference.

NUMBER OF PARKING PRIVILEGES:            Privileges for parking thirty (30)
                                         automobiles, nine (9) of which are
                                         located in the garage below the
                                         Building, and twenty-one (21) of which
                                         will be located on the outdoor surface
                                         lot.

ANNUAL FIXED RENT:                       (a) During the Original Term of this
                                         Lease at the annual rate of Two Hundred
                                         Eight Thousand Seven Hundred Sixty-Four
                                         and 48/100 Dollars ($208,764.48)
                                         (being the product of (i) $24.50 and
                                         (ii) the "Rentable Floor Area of
                                         Tenant's Space" (hereinafter defined in
                                         this Section 1.1). The monthly
                                         installment of annual fixed rent during
                                         the Original Term is $17,397.04.

                                         (b) During the extension option period
                                         (if exercised), as determined pursuant
                                         to Section 8.20.

BASE OPERATING EXPENSES:                 Landlord's Operating Expenses (as
                                         hereinafter defined in Section 2.6) for
                                         calendar year 2002, being January 1,
                                         2002 through December 31, 2002.

BASE TAXES:                              Landlord's Tax Expenses (as hereinafter
                                         defined in Section 2.7) for fiscal tax
                                         year 2003, being July 1, 2002 through
                                         June 30, 2003.

TENANT ELECTRICITY:                      Initially as provided in Section 2.8
                                         subject to adjustment as provided in
                                         Section 2.8.

RENTABLE FLOOR AREA OF TENANT'S SPACE
(SOMETIMES ALSO CALLED RENTABLE FLOOR
AREA OF THE PREMISES):                   8,521 square feet.

TOTAL RENTABLE FLOOR AREA OF THE         368,257 square feet.
BUILDING:

TOTAL RENTABLE FLOOR AREA OF THE         161,734 square feet.
ADDITIONAL BUILDING:

                                      -3-
<PAGE>

TOTAL RENTABLE FLOOR AREA OF THE         529,991 square feet.
BUILDINGS:

PERMITTED USE:                           General office purposes, including
                                         development, marketing and sale of
                                         software, software support and
                                         training.

INITIAL MINIMUM LIMITS OF TENANT'S       $3,000,000.00 combined single limit per
COMMERCIAL GENERAL LIABILITY INSURANCE:  occurrence on a per location basis

BROKERS:                                 Insignia/ESG, Inc. and Cushman &
                                         Wakefield

SECURITY DEPOSIT:                        $104,382.24

GUARANTOR:                               None

1.2 Exhibits. There are incorporated as part of this Lease:

EXHIBIT A Description of Site

EXHIBIT B List of Plans for Landlord's Work

EXHIBIT C Landlord's Services

EXHIBIT D Floor Plan

EXHIBIT E Commencement Date Agreement

EXHIBIT F List of Mortgages

1.3 Table of Articles and Sections

                                      -4-
<PAGE>

                                TABLE OF CONTENTS

<TABLE>
<S>                                                                           <C>
Article I REFERENCE DATA

   1.1    Subjects Referred To  ...........................................    1
   1.2    Exhibits ........................................................    4
   1.3    Table of Articles and Sections ..................................    4

Article II BUILDING, PREMISES, TERM AND RENT

   2.1    The Premises ....................................................    9
   2.2    Rights To Use Common Facilities .................................    9
   2.2.1  Tenant's Parking ................................................   10
   2.3    Landlord's Reservations .........................................   10
   2.4    Habendum ........................................................   10
   2.5    Monthly Fixed Rent Payments .....................................   11
   2.6    Adjustment for Operating Expenses ...............................   11
   2.7    Adjustment for Real Estate Taxes ................................   14
   2.8    Tenant Electricity ..............................................   16

Article III CONDITION OF PREMISES; ALTERATIONS

   3.1    SUBSTANTIAL COMPLETION ..........................................   17
   3.2    OUTSIDE COMPLETION DATE .........................................   19
   3.3    Tenant Alterations and Additions ................................   20

Article IV LANDLORD'S COVENANTS; INTERRUPTIONS AND DELAYS

   4.1    Landlord covenants ..............................................   22
   4.1.1  Services Furnished by Landlord ..................................   22
   4.1.2  Additional Services Available to Tenant .........................   22
   4.1.3  Roof, Exterior Wall, Floor Slab and Common Facility Repairs......   23
</TABLE>

                                      -5-
<PAGE>

<TABLE>
<S>                                                                         <C>
   4.1.4  Door Signs ......................................................   23
   4.2    Interruptions and Delays in Service and Repairs, etc ............   23
   4.3    Landlord's Indemnity ............................................   24

Article V TENANT'S COVENANTS

   5.1    Payments ........................................................   24
   5.2    Repair and Yield Up .............................................   24
   5.3    Use .............................................................   25
   5.4    Obstructions; Items Visible From Exterior; Rules and
               Regulations ................................................   25
   5.5    Safety Appliances; Licenses .....................................   26
   5.6    Assignment; Sublease ............................................   26
   5.7    Indemnity; Insurance ............................................   31
   5.8    Personal Property at Tenant's Risk ..............................   32
   5.9    Right of Entry ..................................................   32
   5.10   Floor Load; Prevention of Vibrations and Noise ..................   33
   5.11   Personal Property Taxes .........................................   33
   5.12   Compliance with Laws ............................................   33
   5.13   Payment of Litigation Expenses ..................................   33

Article VI CASUALTY AND TAKING

   6.1    Fire and Casualty-Termination or Restoration; Rent Adjustment ...   33
   6.2    Uninsured Casualty ..............................................   35
   6.3    Eminent Domain-Termination or Restoration .......................   35
   6.4    Eminent Domain Damages Reserved .................................   36

Article VII DEFAULT

   7.1    Tenant's Default ................................................   37
   7.2    Landlord's Default ..............................................   41
</TABLE>

                                      -6-

<PAGE>
<TABLE>
<S>                                                                         <C>
Article VIII MISCELLANEOUS

   8.1    Extra Hazardous Use .............................................   41
   8.2    Waiver ..........................................................   41
   8.3    Cumulative Remedies .............................................   42
   8.4    Quiet Enjoyment .................................................   42
   8.5    Notice To Mortgagee and Ground Lessor ...........................   43
   8.6    Assignment of Rents .............................................   43
   8.7    Surrender .......................................................   45
   8.8    Brokerage .......................................................   45
   8.9    Invalidity of Particular Provisions .............................   45
   8.10   Provisions Binding; etc .........................................   46
   8.11   Recording .......................................................   46
   8.12   Notices .........................................................   46
   8.13   When Lease Becomes Binding ......................................   47
   8.14   Section Headings ................................................   47
   8.15   Rights of Mortgagee .............................................   47
   8.16   Status Report and Financial Statements ..........................   48
   8.17   Self-Help .......................................................   49
   8.18   Holding Over ....................................................   49
   8.19   Non-Subrogation .................................................   50
   8.20   Extension Option ................................................   50
   8.21   Security Deposit - Letter of Credit .............................   51
   8.22   Late Payment ....................................................   53
   8.23   Governing Law ...................................................   53
   8.24   Additional Rent .................................................   53
</TABLE>

                                      -7-

<PAGE>
<TABLE>
<S>                                                                         <C>
   8.25   Waiver of Trial by Jury .........................................   53
</TABLE>

                                      -8-

<PAGE>

                                   ARTICLE II

                        BUILDING, PREMISES, TERM AND RENT

2.1  Landlord hereby demises and leases to Tenant, and Tenant hereby hires and
     accepts from Landlord, Tenant's Space in the Building excluding exterior
     faces of exterior walls, the common stairways and stairwells, elevators and
     elevator wells, fan rooms, electric and telephone closets, janitor closets,
     freight elevator vestibules, and pipes, ducts, conduits, wires and
     appurtenant fixtures serving exclusively or in common other parts of the
     Building and if Tenant's Space includes less than the entire rentable area
     of any floor, excluding the common corridors, elevator lobbies and toilets
     located on such floor.

     Tenant's Space with such exclusions is hereinafter sometimes referred to as
     the "Premises". The term "Building" means the Building identified on the
     first page, and which is the subject of this Lease and being one of the two
     (2) Buildings erected on the Site by the Landlord; the term "Site" means
     all, and also any part, of the Land described in Exhibit A, plus any
     additions or reductions thereto resulting from the change of any abutting
     street line and all parking areas and structures. The terms "Property" or
     "Complex" means the two (2) Buildings and the Site.

2.2  Subject to Landlord's right to change or alter any of the following in
     Landlord's discretion as herein provided, Tenant shall have, as appurtenant
     to the Premises, the non-exclusive right to use in common with others, but
     not in a manner or extent that would materially interfere with the normal
     operation and use of the Building as a multi-tenant office building and
     subject to reasonable rules of general applicability to tenants of the
     Building from time to time made by Landlord of which Tenant is given
     notice: (a) the common lobbies, corridors, stairways, and elevators of the
     Building, and the pipes, ducts, shafts, conduits, wires and appurtenant
     meters and equipment serving the Premises in common with others, (b) the
     loading areas serving the Building and the common walkways and driveways
     necessary for access to the Building, and (c) if the Premises include less
     than the entire rentable floor area of any floor, the common toilets,
     corridors and elevator lobby of such floor. Tenant shall have the right,
     during the Term of the Lease, to reserve and use free of charge any and all
     of the eight conference rooms in the Building on a first come first serve
     basis, along with the other tenants of the Building and Landlord shall
     maintain a reservation book for such purposes. Notwithstanding anything to
     the contrary herein, Landlord has no obligation to allow any particular
     telecommunication service provider to have access to the Building or the
     Premises. If Landlord permits such access, Landlord may condition such
     access upon the payment to Landlord by the service provider of fees
     assessed by Landlord in its sole discretion. Landlord approves Verizon
     and/or

                                      -9-
<PAGE>

UUNET/Worldcom as Tenant's service provider without assessment of any fees or
charges.

     2.2.1 In addition, Landlord shall provide to Tenant monthly privileges in
           the number specified in Section 1.1 for the parking of automobiles,
           in common with use by other tenants from time to time of the Complex,
           and on a first-come, first-served basis, and Landlord shall not be
           obligated to furnish stalls or spaces on the Site specifically
           designated for Tenant's use. Tenant covenants and agrees that it and
           all persons claiming by, through and under it, shall at all times
           abide by all reasonable rules and regulations promulgated by Landlord
           with respect to the use of the parking areas on the Site. The parking
           privileges granted herein are non-transferable except to a permitted
           assignee or subtenant as provided in Section 5.6 through Section
           5.6.5. Further, Landlord assumes no responsibility whatsoever for
           loss or damage due to fire, theft or otherwise to any automobile(s)
           parked on the Site or to any personal property therein, however
           caused, and Tenant covenants and agrees, upon request from Landlord
           from time to time, to notify its officers, employees, agents and
           invitees of such limitation of liability. Tenant acknowledges and
           agrees that a license only is hereby granted, and no bailment is
           intended or shall be created.

2.3  Landlord reserves the right from time to time, without unreasonable
     interference with Tenant's use: (a) to install, use, maintain, repair,
     replace and relocate for service to the Premises and other parts of the
     Building, or either, pipes, ducts, conduits, wires and appurtenant
     fixtures, wherever located in the Premises or Building, and (b) to alter or
     relocate any other common facility, provided that substitutions are
     substantially equivalent or better. Installations, replacements and
     relocations referred to in clause (a) above shall be located so far as
     practicable in the central core area of the Building, above ceiling
     surfaces, below floor surfaces or within perimeter walls of the Premises.
     Except in the case of emergencies, Landlord agrees to use its best efforts
     to give Tenant reasonable advance notice of any of the foregoing activities
     which require work in the Premises.

2.4  The Term of this Lease shall be the period specified in Section 1.1 hereof
     as the "Lease Term", unless sooner terminated or extended as herein
     provided. The Lease Term hereof shall commence on, and the Commencement
     Date shall be, the later to occur of:

     (a)  The date on which the Phase I Construction is substantially complete,
          as defined in Section 3.1 hereof, (including obtaining a temporary or
          permanent certificate of occupancy from the applicable governmental
          authority, to the extent required by law, for occupancy by Tenant of
          the Premises for the Permitted Use ("Certificate of Occupancy"),
          provided however, that if Landlord obtains a temporary Certificate of
          Occupancy, Landlord shall use due diligence to obtain a permanent
          Certificate of

                                      -10-
<PAGE>
Occupancy promptly thereafter), which date is estimated to occur on or about
July 12, 2002; or

     (b)  July 12, 2002.

     As soon as may be convenient after the Commencement Date has been
     determined, Landlord and Tenant agree to join with each other in the
     execution, in the form of Exhibit E hereto, of a written Commencement Date
     Agreement in which the Commencement Date and specified Lease Term of this
     Lease shall be stated. If Tenant shall fail to execute such Agreement, the
     Commencement Date and Lease Term shall be as reasonably determined by
     Landlord in accordance with the terms of this Lease.

2.5  Tenant agrees to pay to Landlord, or as directed by Landlord, at P.O. Box
     3557, Boston, MA 02241-3557 or at such other place as Landlord shall from
     time to time designate by notice, on the Commencement Date (defined in
     Section 1.1 hereof) and thereafter monthly, in advance, on the first day of
     each and every calendar month during the Original Term, a sum equal to one
     twelfth (1/12th) of the Annual Fixed Rent (sometimes hereinafter referred
     to as "fixed rent") and on the first day of each and every calendar month
     during each extension option period (if exercised), a sum equal to one
     twelfth (1/12th) of the annual fixed rent as determined in Section 8.20 for
     the applicable extension option period.

     Annual Fixed Rent for any partial month shall be paid by Tenant to Landlord
     at such rate on a pro rata basis, and, if the Commencement Date is a day
     other than the first day of a calendar month, the first payment which
     Tenant shall make to Landlord shall be a payment equal to a proportionate
     part of such monthly Annual Fixed Rent for the partial month from the
     Commencement Date to the first day of the succeeding calendar month.

     Other charges payable by Tenant on a monthly basis, as hereinafter
     provided, likewise shall be prorated, and the first payment on account
     thereof shall be determined in similar fashion; and other provisions of
     this Lease calling for monthly payments shall be read as incorporating this
     undertaking by Tenant.

     The Annual Fixed Rent and all other charges for which provision is herein
     made shall be paid by Tenant to Landlord, without offset, deduction or
     abatement except as otherwise specifically set forth in this Lease.

2.6  "Landlord's Operating Expenses" means the cost of operation of the Building
     and the Site which shall exclude costs of special services rendered either
     to Tenant or to other tenants for which a separate charge is made and
     capital expenditures, other than the Permitted Capital Expenditures, as
     defined below, but shall include, without limitation, the following:
     premiums for insurance carried with respect to the Building and the Site
     (including, without limitation, liability insurance,

                                      -11-
<PAGE>
     insurance against loss in case of fire or casualty and insurance of monthly
     installments of fixed rent and any additional rent which may be due under
     this Lease and other leases of space in the Building for not more than 12
     months in the case of both fixed rent and additional rent and if there be
     any first mortgage of the Property, including such insurance as may be
     required by the holder of such first mortgage); compensation and all fringe
     benefits, workmen's compensation insurance premiums and payroll taxes paid
     to, for or with respect to all persons engaged in the operating,
     maintaining, managing, insuring or cleaning of the Building or Site, water,
     sewer, electric, gas, oil and telephone charges (excluding heating,
     ventilating and air conditioning, electricity and utility charges
     separately chargeable to tenants); cost of building and cleaning supplies
     and equipment; cost of maintenance, cleaning and repairs (other than
     repairs not properly chargeable against income or reimbursed from
     contractors under guarantees); cost of snow removal and care of
     landscaping; payments under service contracts with independent contractors;
     payments by the Landlord to the town in which the Complex is located
     relating to traffic safety, fire safety, and other governmental services
     and programs; management fees at reasonable rates consistent with the type
     of occupancy and the service rendered; and all other reasonable and
     necessary expenses paid in connection with the operation, cleaning,
     management, insuring and maintenance of the Building and the Site and
     properly chargeable against income; provided, however, there shall be
     included (a) depreciation for capital expenditures ("Permitted Capital
     Expenditures") made by Landlord (i) to reduce operating expenses if
     Landlord shall have reasonably determined that the annual reduction in
     operating expenses shall exceed depreciation therefor or (ii) to comply
     with applicable laws, rules, regulations, requirements, statutes,
     ordinances, by-laws and court decisions of all public authorities which are
     now or hereafter in force (herein collectively called "Legal
     Requirements"); plus (b) in the case of both (i) and (ii) an interest
     factor, reasonably determined by Landlord, as being the interest rate then
     charged for long term mortgages by institutional lenders on like properties
     within the locality in which the Building is located; depreciation in the
     case of both (i) and (ii) shall be determined by dividing the original cost
     of such Permitted Capital Expenditure by the number of years of useful life
     of the Permitted Capital Expenditure acquired and the useful life shall be
     reasonably determined by Landlord in accordance with generally accepted
     accounting principles and practices in effect at the time of acquisition of
     the Permitted Capital Expenditure; and further provided, however, if
     Landlord reasonably concludes on the basis of engineering estimates that a
     particular Permitted Capital Expenditure will effect savings in other
     Operating Expenses, including, without limitation, energy related costs,
     and that such projected savings will, on an annual basis ("Projected Annual
     Savings"), exceed the annual depreciation therefor, then and in such event
     the amount of depreciation for such Permitted Capital Expenditure shall be
     increased to an amount equal to the Projected Annual Savings; and in such
     circumstance, the increased depreciation (in the amount of the Projected
     Annual Savings) shall be made for such period of time as it would take to
     fully amortize the cost of the item in question, together

                                      -12-
<PAGE>
     with interest thereon at the interest rate as aforesaid in equal monthly
     payments, each in the amount of 1/12th of the Projected Annual Savings,
     with such payment to be applied first to interest and the balance to
     principal. Landlord hereby agrees that there shall be no duplication of
     costs in Landlord's Operating Expenses.

     "Operating Expenses Allocable to the Premises" shall mean (a) the same
     proportion of Landlord's Operating Expenses for and pertaining to the
     Building as the Rentable Floor Area of Tenant's Space bears to the Total
     Rentable Floor Area of the Building plus (b) the same proportion of
     Landlord's Operating Expenses for and pertaining to the Site as the
     Rentable Floor Area of Tenant's Space bears to the Total Rentable Floor
     Area of the Buildings.

     "Base Operating Expenses" is hereinbefore defined in Section 1.1. Base
     Operating Expenses shall not include market-wide cost increases due to
     extraordinary circumstances, including but not limited to, Force Majeure
     (as defined in Section 6.1), boycotts, strikes, conservation surcharges,
     embargoes or shortages.

     "Base Operating Expenses Allocable to the Premises" means (i) the same
     proportion of Base Operating Expenses for and pertaining to the Building as
     the Rentable Floor Area of Tenant's Space bears to the Rentable Floor Area
     of the Building plus (ii) the same proportion of Base Operating Expenses
     for and pertaining to the Site as the Rentable Floor Area of Tenant's Space
     bears to the Rentable Floor Area of the Buildings.

     Beginning with calendar year 2003, if with respect to any calendar year
     falling within the Term, or fraction of a calendar year falling within the
     Term at the beginning or end thereof, the Operating Expenses Allocable to
     the Premises for a full calendar year exceed Base Operating Expenses
     Allocable to the Premises, or for any such fraction of a calendar year
     exceed the corresponding fraction of Base Operating Expenses Allocable to
     the Premises, then Tenant shall pay to Landlord, as Additional Rent, the
     amount of such excess. Such payments shall be made at the times and in the
     manner hereinafter provided in this Section 2.6. The Base Operating
     Expenses Allocable to the Premises do not and the Operating Expenses
     Allocable to the Premises shall not include any costs in respect of
     electricity and HVAC, provision for the payment of which is made in Section
     2.8 of this Lease. Landlord shall provide Tenant with a statement, prepared
     in accordance with the following paragraph, of Base Operating Expenses
     Allocable to the Premises at the same time as operating cost statements for
     such calendar year are provided to other tenants of the Building.

     Not later than one hundred twenty (120) days after the end of the first
     calendar year or fraction thereof ending December 31, 2003 and on December
     31 of each succeeding calendar year during the Term or fraction thereof at
     the end of the Term, Landlord shall render Tenant a statement in reasonable
     detail and according

                                      -13-
<PAGE>
     to usual accounting practices certified by a representative of Landlord,
     showing for the preceding calendar year or fraction thereof, as the case
     may be, Landlord's Operating Expenses and Operating Expenses Allocable to
     the Premises. Said statement to be rendered to Tenant shall also show for
     the preceding year or fraction thereof as the case may be the amounts of
     operating expenses already paid by Tenant as additional rent, and the
     amount of operating expenses remaining due from, or overpaid by, Tenant for
     the year or other period covered by the statement. Within thirty (30) days
     after the date of delivery of such statement, Tenant shall pay to Landlord
     the balance of the amounts, if any, required to be paid pursuant to the
     above provisions of this Section 2.6 with respect to the preceding year or
     fraction thereof, or Landlord shall credit any amounts due from it to
     Tenant pursuant to the above provisions of this Section 2.6 against (i)
     monthly installments of fixed rent next thereafter coming due or (ii) any
     sums then due from Tenant to Landlord under this Lease (or refund such
     portion of the overpayment as aforesaid if the Term has ended and Tenant
     has no further obligation to Landlord).

     In addition, commencing as of January, 2003, Tenant shall make payments
     monthly on account of Tenant's share of increases in Landlord's Operating
     Expenses anticipated for the then current year at the time and in the
     fashion herein provided for the payment of Annual Fixed Rent. The amount to
     be paid to Landlord shall be an amount reasonably estimated annually by
     Landlord to be sufficient to cover, in the aggregate, a sum equal to
     Tenant's share of such increases in Landlord's Operating Expenses for each
     calendar year during the Term.

     If the Building is not at least 95% occupied during any calendar year,
     including calendar year 2002, Landlord's Operating Expenses shall be
     determined as if the Building had been 95% occupied during that calendar
     year and Base Operating Expenses shall also be determined as if the
     Building had been 95% occupied. The extrapolation of Landlord's Operating
     Expenses under this Section shall be performed by appropriately adjusting
     the cost of those components of Landlord's Operating Expenses that are
     impacted by changes in the occupancy of the Building.

2.7  If with respect to any full Tax Year or fraction of a Tax Year falling
     within the Term beginning with the July 1, 2003-June 30, 2004 Tax Year,
     Landlord's Tax Expenses Allocable to the Premises as hereinafter defined
     for a full Tax Year exceed Base Taxes Allocable to the Premises, or for any
     such fraction of a Tax Year exceed the corresponding fraction of Base Taxes
     Allocable to the Premises then, on or before the thirtieth (30th) day
     following receipt by Tenant of the certified statement referred to below in
     this Section 2.7, then Tenant shall pay to Landlord, as Additional Rent,
     the amount of such excess. In addition, payments by Tenant on account of
     increases in real estate taxes anticipated for the then current year shall
     be made monthly at the time and in the fashion herein provided

                                      -14-
<PAGE>
     for the payment of fixed rent commencing July 1, 2003. The amount so to be
     paid to Landlord shall be an amount reasonably estimated by Landlord to be
     sufficient to provide Landlord, in the aggregate, a sum equal to Tenant's
     share of such increases, at least ten (10) days before the day on which
     such payments by Landlord would become delinquent. Landlord shall provide
     Tenant with a statement, prepared in accordance with the following
     sentence, of Base Taxes Allocable to the Premises at the same time as tax
     statements for such Tax Year are provided to other tenants of the Building.
     Not later than one hundred twenty (120) days after Landlord's Tax Expenses
     Allocable to the Premises are determined for the first such Tax Year or
     fraction thereof and for each succeeding Tax Year or fraction thereof
     during the Term, Landlord shall render Tenant a statement in reasonable
     detail certified by a representative of Landlord showing for the preceding
     year or fraction thereof, as the case may be, real estate taxes on the
     Building and the Site and abatements and refunds of any taxes and
     assessments. Expenditures for legal fees and for other expenses incurred in
     obtaining the tax refund or abatement may be charged against the tax refund
     or abatement before the adjustments are made for the Tax Year. Said
     statement to be rendered to Tenant shall also show for the preceding year
     or fraction thereof as the case may be the amounts of real estate taxes
     already paid by Tenant as Additional Rent, and the amount of real estate
     taxes remaining due from, or overpaid by, Tenant for the year or other
     period covered by the statement. Within thirty (30) days after the date of
     delivery of the foregoing statement, Tenant shall pay to Landlord the
     balance of the amounts, if any, required to be paid pursuant to the above
     provisions of this Section 2.7 with respect to the preceding year or
     fraction thereof, or Landlord shall credit monthly installments of fixed
     rent next thereafter coming due, or refund such overpayment if the Term has
     ended and Tenant has no further obligation to Landlord.

     Terms used herein are defined as follows:

     (i)  "Tax Year" means the twelve-month period beginning July 1 each year
          during the Term or if the appropriate governmental tax fiscal period
          shall begin on any date other than July 1, such other date. If during
          the Lease Term the Tax Year is changed by applicable law to less than
          a full 12-month period, the Base Taxes and Base Taxes Allocable to the
          Premises shall each be proportionately reduced.

     (ii) "Landlord's Tax Expenses Allocable to the Premises" shall mean (a) the
          same proportion of Landlord's Tax Expenses for and pertaining to the
          Building as the Rentable Floor Area of Tenant's Space bears to the
          Total Rentable Floor Area of the Building plus (b) the same proportion
          of Landlord's Tax Expenses for and pertaining to the Site as the
          Rentable Floor Area of Tenant's Space bears to the Total Rentable
          Floor Area of the Buildings.

                                      -15-
<PAGE>
     (iii) "Landlord's Tax Expenses" with respect to any Tax Year means the
          aggregate real estate taxes on the Building and Site with respect to
          that Tax Year, reduced by any abatement receipts with respect to that
          Tax Year.

     (iv) "Base Taxes" is hereinbefore defined in Section 1.1.

     (v)  "Base Taxes Allocable to the Premises" means (i) the same proportion
          of Base Taxes for and pertaining to the Building as the Rentable Floor
          Area of Tenant's Space bears to the Total Rentable Floor Area of the
          Building, plus (ii) the same proportion of Base Taxes for and
          pertaining to the Site as the Rentable Floor Area of Tenant's Space
          bears to the Total Rentable Floor Area of the Buildings.

     (vi) "Real estate taxes" means all taxes and special assessments of every
          kind and nature assessed by any governmental authority on the Building
          or Site which the Landlord shall become obligated to pay because of or
          in connection with the ownership, leasing and operation of the Site,
          the Building and the Property and reasonable expenses of any formal or
          informal proceedings for negotiation or abatement of taxes. The amount
          of special taxes or special assessments to be included shall be
          limited to the amount of the installment (plus any interest, other
          than penalty interest, payable thereon) of such special tax or special
          assessment required to be paid during the year in respect of which
          such taxes are being determined. There shall be excluded from such
          taxes all income, estate, succession, inheritance and transfer taxes;
          provided, however, that if at any time during the Term the present
          system of ad valorem taxation of real property shall be changed so
          that in lieu of the whole or any part of the ad valorem tax on real
          property there shall be assessed on Landlord a capital levy or other
          tax on the gross rents received with respect to the Site or Building,
          or a federal, state, county, municipal, or other local income,
          franchise, excise or similar tax, assessment levy or charge distinct
          from any now in effect in the jurisdiction in which the Site or
          Building are located) measured by or based, in whole or in part, upon
          any such gross rents, then any and all of such taxes, assessments,
          levies or charges, to the extent so measured or based, shall be deemed
          to be included within the term "real estate taxes" but only to the
          extent that the same would be payable if the Site and Buildings were
          the only property of Landlord.

2.8  Tenant shall pay to Landlord, as Additional Rent, Tenant's Proportionate
     Share (hereinafter defined) of the cost incurred by the Landlord in
     furnishing electricity and heating, ventilating and air conditioning
     ("HVAC") to the Building and the Site, including common areas and
     facilities and space occupied by tenants, (but expressly excluding utility
     charges separately chargeable to tenants for additional or special services
     and excluding electricity for the HVAC unit serving the

                                      -16-
<PAGE>
     Premises exclusively which shall be measured by a separate submeter
     pursuant to Exhibit C), and Tenant shall pay on account thereof, at the
     time that monthly installments of Annual Fixed Rent are due and payable, as
     Additional Rent, an amount equal to 1/12th (prorated for any partial month)
     of the amount estimated by Landlord from time to time as the Tenant's
     Proportionate Share of the annual cost thereof. If with respect to any
     calendar year falling within the Term or fraction of a calendar year
     falling within the Term at the beginning or end thereof, the Tenant's
     Proportionate Share of the cost of furnishing electricity and HVAC to the
     Building and the Site exceeds the amounts payable on account thereof, then
     Tenant shall pay to Landlord, as Additional Rent, on or before the
     thirtieth (30th) day following receipt by Tenant of the statement referred
     to below in this Section 2.8, Tenant's Proportionate Share of the amount of
     such excess. For and with respect to the electricity and HVAC of the
     Building, the Tenant's Proportionate Share shall be a fraction, the
     numerator of which is the Rentable Floor Area of Tenant's Space and the
     denominator of which is the Total Rentable Floor Area of the Building, and
     for and with respect to the electricity for the Site the Tenant's
     Proportionate Share shall be a fraction, the numerator of which is the
     Rentable Floor Area of Tenant's Space and the denominator of which is the
     Total Rentable Floor Area of the Buildings.

     Not later than one hundred twenty (120) days after the end of the first
     calendar year or fraction thereof ending December 31 and of each succeeding
     calendar year during the Term or fraction thereof at the end of the Term,
     Landlord shall render Tenant a reasonably detailed accounting certified by
     a representative of Landlord showing for the preceding calendar year, or
     fraction thereof, as the case may be, the costs of furnishing electricity
     and HVAC to the Building and the Site. Said statement to be rendered to
     Tenant also shall show for the preceding year or fraction thereof, as the
     case may be, the amount already paid by Tenant on account of electricity
     and HVAC, and the amount remaining due from, or overpaid by, Tenant for the
     year or other period covered by the statement.

                                  ARTICLE III

                       CONDITION OF PREMISES; ALTERATIONS

3.1  SUBSTANTIAL COMPLETION

     (A) Landlord shall perform the work described on Exhibit B annexed hereto
     and described therein as the Phase I Construction and the Phase II
     Construction (collectively, "Landlord's Work"); provided, however, that the
     Landlord shall have no responsibility for the installation or connection of
     Tenant's computer, telephone, other communication equipment, systems or
     wiring. It is agreed that (i) construction of the Phase I Construction is
     intended to be "turnkey" and will be completed at Landlord's sole cost and
     expense (subject to the terms of Section 3.1(B) below) and (ii) subject to
     Section 3.2.B, Tenant shall, as Additional Rent,

                                      -17-

<PAGE>
     after the Phase II Construction is completed, reimburse Landlord upon
     demand an amount ("Phase II Contribution") equal to the lesser of (x)
     one-half (1/2) of the cost of the Phase II Construction or (y) Two Thousand
     and 00/100 ($2,000.00) Dollars, and Landlord shall be responsible for the
     balance of the costs of the Phase II Construction. Landlord's Work shall be
     performed using Building Standard methods, materials and finishes. Landlord
     and Tenant hereby agree that that certain letter agreement dated June 27,
     2002 between Landlord and Tenant relating to reimbursement of certain
     construction related costs shall upon the full execution and delivery of
     this Lease be of no further force or effect.

     (B) If Tenant shall request any revisions to Landlord's Work, Landlord
     shall have such revisions prepared at Tenant's sole cost and expense and
     Tenant shall reimburse Landlord for the cost of preparing any such
     revisions to the Landlord's Work, plus any applicable state sales or use
     tax thereon, upon demand. Promptly upon completion of the revisions,
     Landlord shall notify Tenant in writing of the increased cost in Landlord's
     Work, if any, resulting from such revisions to the Landlord's Work. Tenant,
     within one business day shall notify Landlord in writing whether it desires
     to proceed with such revisions. In the absence of such written
     authorization, Landlord shall have the option to continue to work on the
     Premises disregarding the requested revision. Tenant shall be responsible
     for any Tenant Delay in completion of the Premises resulting from any
     revisions to the Landlord's Work. If such revisions result in an increase
     in the cost of Landlord's Work, such increased costs plus any applicable
     state sales or use tax thereon, shall be payable by Tenant upon demand.
     Notwithstanding anything herein to the contrary, all revisions to the
     Landlord's Work shall be subject to the approval of Landlord.

     (C) Subject to delays due to Force Majeure, as defined in Section 6.1,
     Landlord shall use reasonable speed and diligence in the performance of
     Landlord's Work, but Tenant shall have no claim against Landlord for
     failure so to complete construction of Landlord's Work in the Premises,
     except for the right to terminate this Lease, without further liability to
     either party, in accordance with the provisions hereinafter specified in
     Section 3.2.

     The Phase I Construction shall be treated as having been substantially
     completed on the later of:

     (a)  The date on which the Phase I Construction, together with common
          facilities for access and services to the Premises, has been completed
          (or would have been completed except for Tenant Delay) except for
          items of work and adjustment of equipment and fixtures which can be
          completed after occupancy has been taken without causing substantial
          interference with Tenant's use of the Premises (i.e. so-called "punch
          list" items) and items of work for which there is a long lead time in
          obtaining the materials therefore or which are specially or
          specifically manufactured, produced or

                                      -18-
<PAGE>
          milled for the work in or to the Premises and require additional time
          for receipt or installation ("long lead" items), or

     (b)  The date when Landlord has received a Certificate of Occupancy, as
          defined in Section 2.4(a).

     The Phase II Construction shall be performed promptly after the substantial
     completion of the Phase I Construction.

     Landlord shall complete as soon as conditions practically permit all items
     and work excepted by Section 3.1(C)(a) above, and Tenant shall cooperate
     with Landlord in providing access as may be required to complete such work
     in a normal manner. Landlord shall permit Tenant access for installing
     Tenant's trade fixtures in portions of the Premises prior to substantial
     completion when it can be done without material interference with remaining
     work or with the maintenance of harmonious labor relations. In the event of
     any dispute as to the date on which the Phase I Construction has been
     completed as described in subsection 3.1(B)(a) above, the reasonable
     determination of Landlord's architect as to such date shall be deemed
     conclusive and binding on both Landlord and Tenant.

     Tenant agrees that no delay by it, or anyone employed by it, in performing
     work to prepare the Premises for occupancy (including, without limitation,
     the work in installing Tenant's trade fixtures) (collectively a "Tenant
     Delay") shall delay commencement of the Term or the obligation to pay rent,
     regardless of the reason for such delay or whether or not it is within the
     control of Tenant or any such employee, and the Phase I Construction shall
     be deemed completed as of the date when the same would have been
     substantially completed except for Tenant Delay, as determined by Landlord
     in the exercise of its good faith business judgment. Nothing contained in
     this paragraph shall limit or qualify or prejudice any other covenants,
     agreements, terms, provisions and conditions contained in this Lease.

3.2  A. If Landlord shall have failed substantially to complete the Phase I
     Construction in the Premises described in Exhibit B on or before the
     Outside Completion Date for Phase I Construction as defined in Section 1.1
     hereof (which date shall be extended automatically for such periods of time
     as Landlord is prevented from proceeding with or completing the same by
     reason of Force Majeure as defined in Section 6.1) Tenant shall have the
     right to terminate this Lease by giving notice ("Termination Notice") to
     Landlord of Tenant's desire to do so before such completion and after the
     Outside Completion Date for the Phase I Construction (as so extended) and
     by paying to Landlord, at the time that Tenant gives such Termination
     Notice, the sum of Thirty Thousand and 00/100 ($30,000.00) Dollars
     ("Termination Fee"); and, upon the giving of such Termination Notice and
     the payment of such Termination Fee, the term of this Lease shall cease and
     come to an end without further liability or obligation on the part of
     either party; and such right of termination shall be Tenant's sole and

                                      -19-

<PAGE>
     exclusive remedy for Landlord's failure so to complete the Phase I
     Construction within such time. Each day of Tenant Delay shall be deemed
     conclusively to cause an equivalent day of delay by Landlord in
     substantially completing the Phase I Construction pursuant to Section 3.1,
     and thereby automatically extend for each such equivalent day of delay the
     date of the Outside Completion Date for the Phase I Construction. If Tenant
     fails to pay the Termination Fee at the time Tenant gives such Termination
     Notice, then Tenant's Termination Notice shall be null and void and of no
     force or effect.

     B. In addition, if Landlord shall have failed to obtain a permanent
     Certificate of Occupancy on or before the expiration of the temporary
     Certificate of Occupancy, as such temporary Certificate of Occupancy may be
     extended, and if such failure is not due to the acts or omissions of
     Tenant, Tenant's agents, contractors or employees, then Tenant shall have
     the right to terminate this Lease by giving notice ("CO Termination
     Notice") to Landlord of Tenant's desire to do so before Landlord obtains
     the permanent Certificate of Occupancy and, upon the giving of such CO
     Termination Notice, the term of this Lease shall cease and come to an end
     without further liability or obligation on the part of either party; and
     such right of termination shall be Tenant's sole and exclusive remedy for
     Landlord's failure so to obtain a permanent Certificate of Occupancy on or
     before the expiration of the temporary Certificate of Occupancy, as it may
     be extended.

     C. If Landlord shall have failed substantially to complete the Phase II
     Construction in the Premises described in Exhibit B on or before the
     Outside Completion Date for the Phase II Construction as defined in Section
     1.1 hereof (which date shall be extended automatically for such periods of
     time as Landlord is prevented from proceeding with or completing the same
     by reason of Force Majeure as defined in Section 6.1) then Tenant shall
     have no obligation to pay to Landlord the Phase II Contribution, as defined
     in Section 3.1(A), which shall be Tenant's sole and exclusive remedy for
     Landlord's failure so to complete the Phase II Construction within such
     time. Each day of Tenant Delay shall be deemed conclusively to cause an
     equivalent day of delay by Landlord in substantially completing the Phase
     II Construction pursuant to Section 3.1, and thereby automatically extend
     for such equivalent day of delay the date of the Outside Completion Date
     for the Phase II Construction.

3.3  This Section 3.3 shall apply before and during the Term. All construction
     work required or permitted by this Lease shall be done in a good and
     workmanlike manner and in compliance with all applicable laws, ordinances,
     rules, regulations, statutes, by-laws, court decisions, and orders and
     requirements of all public authorities ("Legal Requirements") and all
     Insurance Requirements (as defined in this Section 3.3 hereof). All of
     Tenant's work shall be coordinated with any work being performed by or for
     Landlord and in such manner as to maintain harmonious labor relations. Each
     party may inspect the work of the other at reasonable times and shall
     promptly give notice of observed defects. Each party

                                      -20-
<PAGE>
     authorizes the other to rely in connection with design and construction
     upon approval and other actions on the party's behalf by any Construction
     Representative of the party named in Section 1.1 or any person hereafter
     designated in substitution or addition by notice to the party relying.
     Except as otherwise provided in Article IV, the work required of Landlord
     pursuant to this Article III, if any, shall be deemed approved by Tenant
     when Tenant commences occupancy of the Premises for the Permitted Use,
     except for items which are then uncompleted (including punch list items and
     long lead items) and as to which Tenant shall have given Landlord notice
     prior to such date. Tenant shall not make alterations and additions to
     Tenant's space except in accordance with plans and specifications therefor
     first approved by Landlord, which approval shall not be unreasonably
     withheld or delayed. However, Landlord's determination of matters relating
     to aesthetic issues relating to alterations, additions or improvements
     which are visible outside the Premises shall be in Landlord's sole
     discretion. Without limiting such standard Landlord shall not be deemed
     unreasonable for withholding approval of any alterations or additions
     (including, without limitation, any alterations or additions to be
     performed by Tenant under Section 3.1) which (a) involve or, in Landlord's
     opinion, might affect any structural or exterior element of the Building,
     any area or element outside of the Premises, or any facility serving any
     area of the Building outside of the Premises, or (b) will delay completion
     of the Premises or Building, or (c) will require unusual expense to readapt
     the Premises to normal office use on Lease termination or increase the cost
     of construction or of insurance or taxes on the Building or of the services
     called for by Section 4.1 unless Tenant first gives assurance acceptable to
     Landlord for payment of such increased cost and that such readaptation will
     be made prior to such termination without expense to Landlord, or (d) are
     inconsistent, in Landlord's judgment, with alterations satisfying
     Landlord's standards for new alterations in the Building. Landlord's review
     and approval of any such plans and specifications and consent to perform
     work described therein shall not be deemed an agreement by Landlord that
     such plans, specifications and work conform with applicable Legal
     Requirements and requirements of insurers of the Building (herein cared
     "Insurance Requirements") nor deemed a waiver of Tenant's obligations under
     this Lease with respect to applicable Legal Requirements and Insurance
     Requirements nor impose any liability or obligation upon Landlord with
     respect to the completeness, design sufficiency or compliance of such
     plans, specifications and work with applicable Legal Requirements and
     Insurance Requirements. Within 30 days after receipt of an invoice from
     Landlord, Tenant shall pay to Landlord, as a fee for Landlord's review of
     any plans or work (excluding any review respecting initial improvements),
     as Additional Rent: (i) actual out-of-pocket cost of such review, plus (ii)
     third party expenses incurred by Landlord to review Tenant's plans and
     Tenant's work. All alterations and additions shall be part of the Building
     unless and until Landlord shall specify the same for removal pursuant to
     Section 5.2. All of Tenant's alterations and additions and installation of
     furnishings shall be coordinated with any work being performed by Landlord
     and

                                      -21-
<PAGE>
     in such manner as to maintain harmonious labor relations and not to damage
     the Buildings or Site or interfere with construction or operation of the
     Buildings and other improvements to the Site and, except for installation
     of furnishings, shall be performed by Landlord's general contractor or by
     contractors or workers first approved by Landlord. Except for work by
     Landlord's general contractor, Tenant, before its work is started, shall
     secure all licenses and permits necessary therefor; deliver to Landlord a
     statement of the names of all its contractors and subcontractors and the
     estimated cost of all labor and material to be furnished by them and
     security satisfactory to Landlord protecting Landlord against liens arising
     out of the furnishing of such labor and material; and cause each contractor
     to carry workmen's compensation insurance in statutory amounts covering all
     the contractor's and subcontractor's employees and commercial general
     liability insurance or comprehensive general liability insurance with a
     broad form comprehensive liability endorsement with such limits as Landlord
     may reasonably require, but in no event less than $3,000,000.00 combined
     single limit per occurrence on a per location basis (all such insurance to
     be written in companies approved by Landlord and naming and insuring
     Landlord and Landlord's managing agent as additional insureds and insuring
     Tenant as well as the contractors), and to deliver to Landlord certificates
     of all such insurance. Tenant agrees to pay promptly when due the entire
     cost of any work done on the Premises by Tenant, its agents, employees, or
     independent contractors, and not to cause or permit any liens for labor or
     materials performed or furnished in connection therewith to attach to the
     Premises or the Buildings or the Site and immediately to discharge any such
     liens which may so attach. Tenant shall pay, as additional rent, 100% of
     any real estate taxes on the Complex which shall, at any time after
     commencement of the Term, result from any alteration, addition or
     improvement to the Premises made by Tenant.

                                   ARTICLE IV

                 LANDLORD'S COVENANTS; INTERRUPTIONS AND DELAYS

4.1  Landlord covenants:

     4.1.1 To furnish services, utilities, facilities and supplies set forth in
          Exhibit C equal to those customarily provided by landlords in high
          quality buildings in the Boston West Suburban Market subject to
          escalation reimbursement in accordance with Section 2.6.

     4.1.2 To furnish, at Tenant's expense, reasonable additional Building
          operation services which are usual and customary in similar office
          buildings in the Boston West Suburban Market upon reasonable advance
          request of Tenant at reasonable and equitable rates from time to time
          established by Landlord.

                                      -22-

<PAGE>
     4.1.3 Subject to the escalation provisions of Section 2.6 and except as
          otherwise provided in Article VI, (i) to make such repairs to the
          roof, exterior walls, floor slabs and common areas and facilities and
          all water, sewer, electrical, sprinkler, HVAC and other Building
          systems which serve the Building generally as may be necessary to keep
          them in serviceable condition and (ii) to maintain the Building
          (exclusive of Tenant's responsibilities under this Lease) in a first
          class manner comparable to the maintenance of similar properties in
          the Boston West Suburban Market.

     4.1.4 To provide and install, at Landlord's expense for the initial
          installation (all changes thereafter at Tenant's expense), letters or
          numerals on doors in the Premises and Tenant identification on the
          Building directory in the lobby of the Building to identify Tenant's
          official name and Building address; all such letters and numerals
          shall be in the building standard graphics and no others shall be used
          or permitted on the Premises.

4.2  Landlord shall not be liable to Tenant for any compensation or reduction of
     rent by reason of inconvenience or annoyance or for loss of business
     arising from the necessity of Landlord or its agents entering the Premises
     for any of the purposes in this Lease authorized, or for repairing the
     Premises or any portion of the Building or Site however the necessity may
     occur. In case Landlord is prevented or delayed from making any repairs,
     alterations or improvements, or furnishing any services or performing any
     other covenant or duty to be performed on Landlord's part, by reason of any
     cause reasonably beyond Landlord's control, including without limitation
     strike, lockout, breakdown, accident, order or regulation of or by any
     Governmental authority, or failure of supply, or inability by the exercise
     of reasonable diligence to obtain supplies, parts or employees necessary to
     furnish such services, or because of war or other emergency, or for any
     cause due to any act or neglect of Tenant or Tenant's servants, agents,
     employees, licensees or any person claiming by, through or under Tenant, or
     other causes reasonably beyond Landlord's control, Landlord shall not be
     liable to Tenant therefor, nor, except as expressly otherwise provided in
     Article VI, shall Tenant be entitled to any abatement or reduction of rent
     by reason thereof, nor shall the same give rise to a claim in Tenant's
     favor that such failure constitutes actual or constructive, total or
     partial, eviction from Premises.

     Landlord reserves the right to stop any service or utility system, when
     necessary by reason of accident or emergency, or until necessary repairs
     have been completed; provided, however, that in each instance of stoppage,
     Landlord shall exercise reasonable diligence to eliminate the cause
     thereof. Except in case of emergency repairs, Landlord will give Tenant
     reasonable advance notice of any contemplated stoppage and will use
     reasonable efforts to avoid unnecessary inconvenience to Tenant by reason
     thereof.

                                      -23-

<PAGE>
4.3  Subject to the limitations on Landlord's liability set forth in this Lease,
     and subject to Section 8.19, Landlord agrees to indemnify, defend and save
     harmless Tenant from and against any claim arising from any accident,
     injury or damage occurring in the Premises, in the Building or on the
     Property after the date that possession of the Premises is first delivered
     to Tenant and until the expiration or earlier termination of the Lease
     Term, to the extent that such accident, injury or damage results from the
     negligence or willful misconduct of Landlord or Landlord's agents,
     employees or contractors. Landlord shall have the right, without Tenant's
     approval, to settle any litigation arising within the scope of Landlord's
     indemnity, provided that Tenant is not required to pay any portion of such
     settlement.

                                    ARTICLE V

                               TENANT'S COVENANTS

     Tenant covenants during the term and such further time as Tenant occupies
any part of the Premises:

5.1  To pay when due all fixed rent and additional rent and all charges for
     utility services rendered to the Premises (except as otherwise provided in
     Exhibit C) and, as further additional rent, all charges for additional
     services rendered pursuant to Section 4.1.2.

5.2  Except as otherwise provided in Article VI and Section 4.1.3 to keep the
     Premises in good order, repair and condition, reasonable wear and tear only
     excepted (the parties hereby acknowledging that the carpeting in the
     Premises presently has significant gaps in the seams which Tenant shall not
     be obligated to repair hereunder), and all glass in windows (except glass
     in exterior walls unless the damage thereto is attributable to Tenant's
     negligence or misuse) and doors of the Premises whole and in good condition
     with glass of the same type and quality as that injured or broken, damage
     by fire or taking under the power of eminent domain only excepted, and at
     the expiration or termination of this Lease peaceably to yield up the
     Premises all construction, work, improvements, and all alterations and
     additions thereto in good order, repair and condition, reasonable wear and
     tear only excepted, first removing (i) all goods and effects of Tenant,
     (ii) the wiring for Tenant's computer, telephone and other communication
     systems and equipment, unless Landlord, by notice to Tenant given at least
     ten (10) days before such expiration or termination, specifies that such
     wiring need not be removed, and (iii) to the extent specified by Landlord
     by notice to Tenant given at least ten (10) days before such expiration or
     termination, all alterations and additions made by Tenant and all
     partitions, and repairing any damages caused by such removal and restoring
     the Premises and leaving them clean and neat. Notwithstanding the
     foregoing, Landlord agrees to make such election at the time that Landlord
     approves Tenant's plans for any such alterations, etc., if Tenant requests
     in writing that Landlord make such election at the time that Tenant
     requests Landlord's

                                      -24-
<PAGE>
     approval of such alterations, etc. Tenant shall not permit or commit any
     waste, and Tenant shall be responsible for the cost of repairs which may be
     made necessary by reason of damage to common areas in the Building, to the
     Site or to the other building caused by Tenant, Tenant's agents, employees,
     contractors, sublessees, licensees, concessionaires or invitees. Tenant
     shall maintain all its equipment, furniture and furnishings in good order
     and repair. Landlord agrees to assign any warranties to Tenant for
     enforcement which Landlord receives in connection with the HVAC unit
     installed by Landlord as part of the Landlord's Work.

5.3  To use the Premises for the Permitted Uses only, and not to injure or
     deface the Premises, Building, the Additional Building, the Site or any
     other part of the Complex nor to permit in the Premises or on the Site any
     auction sale, vending machine, or inflammable fluids or chemicals, or
     nuisance, or the emission from the Premises of any objectionable noise or
     odor, nor to use or devote the Premises or any part thereof for any purpose
     other than the Permitted Uses, nor any use thereof which is inconsistent
     with the maintenance of the Building as an office building of the first
     class in the quality of its maintenance, use and occupancy, or which is
     improper, offensive, contrary to law or ordinance or liable to invalidate
     or increase the premiums for any insurance on the Building or its contents
     or liable to render necessary any alteration or addition to the Building.
     Further, (i) Tenant shall not, nor shall Tenant permit its employees,
     invitees, agents, independent contractors, contractors, assignees or
     subtenants to, keep, maintain, store or dispose of (into the sewage or
     waste disposal system or otherwise) or engage in any activity which might
     produce or generate any substance which is or may hereafter be classified
     as a hazardous material, waste or substance (collectively "Hazardous
     Materials") (other than standard quantities of customary office supplies
     and cleaning materials kept, used and disposed of in accordance with all
     applicable laws), under federal, state or local laws, rules and
     regulations, including, without limitation, 42 U.S.C. Section 6901 et seq.,
     42 U.S.C. Section 9601 et seq., 42 U.S.C. Section 2601 et seq., 49 U.S.C.
     Section 1802 et seq. and Massachusetts General Laws, Chapter 21E and the
     rules and regulations promulgated under any of the foregoing, as such laws,
     rules and regulations may be amended from time to time (collectively
     "Hazardous Materials Laws"), (ii) Tenant shall immediately notify Landlord
     of any incident in, on or about the Premises, the Building or the Site that
     would require the filing of a notice under any Hazardous Materials Laws,
     (iii) Tenant shall comply and shall cause its employees, invitees, agents,
     independent contractors, contractors, assignees and subtenants to comply
     with each of the foregoing and (iv) Landlord shall have the right to make
     such inspections (including testing) as Landlord shall elect from time to
     time to determine that Tenant is complying with the foregoing.

5.4  Not to obstruct in any manner any portion of the Building not hereby leased
     or any portion thereof or of the other building or of the Site used by
     Tenant in common with others; not without prior consent of Landlord to
     permit the painting or

                                      -25-
<PAGE>
     placing of any signs, curtains, blinds, shades, awnings, aerials or
     flagpoles, or the like, visible from outside the Premises; and to comply
     with all reasonable Rules and Regulations now or hereafter made by
     Landlord, of which Tenant has been given notice, for the care and use of
     the Building and Site and their facilities and approaches; Landlord shall
     not be liable to Tenant for the failure of other occupants of the Buildings
     to conform to such rules and regulations. Notwithstanding anything to the
     contrary in this Lease contained, Landlord agrees that it will not enforce
     said Rules and Regulations against Tenant in a discriminatory or arbitrary
     manner.

5.5  To keep the Premises equipped with all safety appliances required by any
     public authority because of any use made by Tenant other than normal office
     use, and to procure all licenses and permits so required because of such
     use and, if requested by Landlord, to do any work so required because of
     such use, it being understood that the foregoing provisions shall not be
     construed to broaden in any way Tenant's Permitted Use.

5.6  Except as otherwise expressly provided herein, Tenant covenants and agrees
     that it shall not assign, mortgage, pledge, hypothecate or otherwise
     transfer this Lease and/or Tenant's interest in this Lease or sublet (which
     term, without limitation, shall include granting of concessions, licenses
     or the like) the whole or any part of the Premises. Any assignment,
     mortgage, pledge, hypothecation, transfer or subletting not expressly
     permitted in or consented to by Landlord under Sections 5.6.1-5.6.5 shall
     be void, ab initio; shall be of no force and effect; and shall confer no
     rights on or in favor of third parties. In addition, Landlord shall be
     entitled to seek specific performance of, and other equitable relief with
     respect to, the provisions hereof. Notwithstanding the foregoing, changes
     in equity ownership in Tenant shall not constitute an assignment for the
     purposes of this Section 5.6 nor be subject to Landlord's termination right
     pursuant to Section 5.6.1.1 nor require notice to Landlord pursuant to
     Section 5.6 3 nor require a separate written instrument with Landlord
     pursuant to Section 5.6.5 nor be deemed transfers or other events requiring
     Landlord's consent under this Section 5.6 of the Lease so long as such
     changes are not for the purpose of avoiding or otherwise circumventing the
     provisions of this Section 5.6.

     5.6.1 Notwithstanding the foregoing provisions of Section 5.6 above and the
          provisions of Section 5.6.2 below, but subject to the provisions of
          Sections 5.6.3, 5.6.4 and 5.6.5, below Tenant shall have the right to
          assign this Lease or to sublet the Premises (in whole or in part) to
          any parent or subsidiary corporation or affiliate of Tenant or to any
          corporation or entity into which Tenant may be converted into or with
          which it may be merged or consolidated or which shall succeed to all
          or substantially all of the business or assets of Tenant, provided
          that the entity to which this Lease is so assigned or which so sublets
          the Premises has a credit worthiness (e.g. assets on a pro forma basis
          using generally accepted accounting principles

                                      -26-
<PAGE>
     consistently applied and using the most recent financial statements) which
     is the same or better than the Tenant as of the Date of this Lease. For
     purposes hereof, an "affiliate" shall be any person or entity which shall
     control, shall be controlled by or shall be under common control with
     Tenant. If any parent or subsidiary corporation or affiliate of Tenant to
     which this Lease is assigned or the Premises sublet (in whole or in part)
     shall cease to be such a parent or subsidiary corporation or affiliate,
     such cessation shall be considered an assignment or subletting requiring
     Landlord's consent. Section 5.6.1.1 shall not be applicable to an
     assignment or sublease pursuant to this Section 5.6.1.

          5.6.1.1 Notwithstanding the provisions of Section 5.6 above, in the
               event Tenant desires to assign this Lease or to sublet the whole
               (but not part) of the Premises (no partial subletting being
               permitted other than as provided in Section 5.6.1), Tenant shall
               notify Landlord thereof in writing and Landlord shall have the
               right at its sole option, to be exercised within thirty (30) days
               after receipt of Tenant's notice, to terminate this Lease as of a
               date specified in a notice to Tenant, which date shall be sixty
               (60) days after Landlord's notice to Tenant; provided, however,
               that upon the termination date as set forth in Landlord's notice,
               all obligations relating to the period after such termination
               date (but not those relating to the period before such
               termination date) shall cease and promptly upon being billed
               therefor by Landlord, Tenant shall make final payment of all rent
               and additional rent due from Tenant through the termination date.
               In the event that Landlord shall not exercise its termination
               rights as aforesaid, or shall fail to give any or timely notice
               pursuant to this Section the provisions of Sections 5.6.2-5.6.5
               shall be applicable. This Section 5.6.1.1 shall not be applicable
               to an assignment or sublease pursuant to Section 5.6.1.

     5.6.2 Notwithstanding the provisions of Section 5.6 above, but subject to
          the provisions of this Section 5.6.2 and the provisions of Sections
          5.6.3, 5.6.4 and 5.6.5 below, in the event that Landlord shall not
          have exercised the termination right as set forth in Section 5.6.1.1,
          or shall have failed to give any or timely notice under Section
          5.6.1.1, then for a period of ninety (90) days (i) after the receipt
          of Landlord's notice stating that Landlord does not elect the
          termination right, or (ii) after the expiration of the thirty (30) day
          period referred to in Section 5.6.1.1 in the event Landlord shall not
          give any or timely notice under Section 5.6.1.1, as the case may be,
          Tenant shall have the right to assign this Lease or sublet the whole
          (but not part) of the Premises in accordance with Tenant's notice to
          Landlord given as provided in Section 5.6.3 provided that, in each
          instance, Tenant first obtains the express prior written consent of
          Landlord, which consent shall not be unreasonably withheld or delayed.
          Without limiting the foregoing

                                      -27-
<PAGE>
          standard, Landlord shall not be deemed to be unreasonably withholding
          its consent to such a proposed assignment or subleasing if:

     (a)  the proposed assignee or subtenant is a tenant in the Building, is (or
          within the previous sixty (60) days has been) in active negotiation
          with Landlord for premises in the Building or is not of a character
          consistent with the operation of a first class office building (by way
          of example Landlord shall not be deemed to be unreasonably withholding
          its consent to an assignment or subleasing to any governmental or
          quasi-governmental agency), or

     (b)  the proposed assignee or subtenant is not of good character and
          reputation, or

     (c)  the proposed assignee or subtenant does not possess adequate financial
          capability to perform the Tenant obligations as and when due or
          required, or

     (d)  the assignee or subtenant proposes to use the Premises (or part
          thereof) for a purpose other than the purpose for which the Premises
          may be used as stated in Section 1.1 hereof, or

     (e)  the character of the business to be conducted or the proposed use of
          the Premises by the proposed subtenant or assignee shall (i) be likely
          to increase Landlord's Operating Expenses beyond that which Landlord
          now incurs for use by Tenant; (ii) be likely to increase the burden on
          elevators or other Building systems or equipment over the burden prior
          to such proposed subletting or assignment; or (iii) violate or be
          likely to violate any provisions or restrictions contained herein
          relating to the use or occupancy of the Premises, or

     (f)  there shall be existing an Event of Default (defined in Section 7.1),
          or

     (g)  any part of the rent payable under the proposed assignment or sublease
          shall be based in whole or in part on the income or profits derived
          from the Premises of if any proposed assignment or sublease shall
          potentially have any adverse effect on the real estate investment
          trust qualification requirements applicable to Landlord and its
          affiliates, or

     (h)  the holder of any mortgage or ground lease on property which includes
          the Premises does not approve of the proposed assignment or sublease
          and Landlord provides evidence to Tenant of such disapproval of the
          proposed assignment or subletting.

                                      -28-
<PAGE>

     5.6.3 Tenant shall give Landlord prior notice of any proposed sublease or
          assignment (provided that, if prohibited by confidentiality in
          connection with a proposed sale, merger, consolidation or
          reorganization, then Tenant shall give Landlord written notice within
          10 days after the effective date of the proposed sale, merger,
          consolidation or reorganization), and said notice shall specify the
          provisions of the proposed assignment or subletting, including (a) the
          name and address of the proposed assignee or subtenant, (b) in the
          case of a proposed assignment or subletting pursuant to Section 5.6.2,
          such information as to the proposed assignee's or proposed subtenant's
          net worth and financial capability and standing as may reasonably be
          required for Landlord to make the determination referred to in Section
          5.6.2 above (provided, however, that Landlord shall hold such
          information confidential having the right to release same to its
          officers, accountants, attorneys and mortgage lenders on a
          confidential basis), (c) all of the terms and provisions upon which
          the proposed assignment or subletting is to be made, (d) in the case
          of a proposed assignment or subletting pursuant to Section 5.6.2, all
          other information necessary to make the determination referred to in
          Section 5.6.2 above and (e) in the case of a proposed assignment or
          subletting pursuant to Section 5.6.1 above, such information as may be
          reasonably required by Landlord to determine that such proposed
          assignment or subletting complies with the requirements of said
          Section 5.6.1. No partial subletting shall be permitted.

          If Landlord shall consent to the proposed assignment or subletting, as
          the case may be, then, in such event, Tenant may thereafter sublease
          (the whole but (except in the case of a partial sublease under Section
          5.6.1) not part of the Premises) or sign pursuant to Tenant's notice,
          as given hereunder; provided, however, that if such assignment or
          sublease shall not be executed and delivered to Landlord within
          ninety (90) days after the date of Landlord's consent, the consent
          shall be deemed null and void and the provisions of Section 5.6.1.1
          shall be applicable.

     5.6.4 In addition, in the case of any assignment or subleasing as to which
          Landlord may consent (other than an assignment or subletting permitted
          under Section 5.6.1 hereof) such consent shall be upon the express and
          further condition, covenant and agreement, and Tenant hereby covenants
          and agrees that, in addition to the Annual Fixed Rent, additional rent
          and other charges to be paid pursuant to this Lease, fifty percent
          (50%) of the "Assignment/Sublease Profits" (hereinafter defined), if
          any, shall be paid to Landlord.

                                      -29-
<PAGE>
          The "Assignment/Sublease Profits" shall be the excess, if any, of (a)
          the "Assignment/Sublease Net Revenues" as hereinafter defined over (b)
          the Annual Fixed Rent and additional rent and other charges provided
          in this Lease (provided, however, that for the purpose of calculating
          the Assignment/Sublease Profits in the case of a sublease, appropriate
          proportions in the applicable Annual Fixed Rent, additional rent and
          other charges under this Lease shall be made based on the percentage
          of the Premises subleased and on the terms of the sublease). The
          "Assignment/Sublease Net Revenues" shall be the fixed rent, additional
          rent and all other charges and sums payable either initially or over
          the term of the sublease or assignment, less the reasonable costs of
          Tenant incurred in such subleasing or assignment (the definition of
          which shall include but not necessarily be limited to rent
          concessions, brokerage commissions and alteration allowances) as set
          forth in a statement certified by an appropriate officer of Tenant and
          delivered to Landlord within thirty (30) days of the full execution of
          the sublease or assignment document, amortized over the term of the
          sublease or assignment.

          All payments of the Assignment/Sublease Profits due Landlord shall be
          made within ten (10) days of receipt of same by Tenant.

     5.6.5 (A) It shall be a condition of the validity of any assignment or
          subletting permitted under Section 5.6.1 above, or consented to under
          Section 5.6.2 above, that both Tenant and the assignee or sublessee
          agree directly with Landlord in a separate written instrument
          reasonably satisfactory to Landlord which contains terms and
          provisions reasonably required by Landlord, including, without
          limitation, the agreement of the assignee or sublessee to be bound by
          all the obligations of the Tenant hereunder, including, without
          limitation, the obligation to pay the rent and other amounts provided
          for under this Lease (but in the case of a partial subletting pursuant
          to Section 5.6.1, such subtenant shall agree on a pro rata basis to be
          so bound) including the provisions of Sections 5.6 through 5.6.5
          hereof (if prohibited by confidentiality in connection with a proposed
          sale, merger, consolidation or reorganization, then Tenant shall
          execute such written instrument within 10 days after the effective
          date of the proposed sale, merger, consolidation or reorganization),
          but such assignment or subletting shall not relieve the Tenant named
          herein of any of the obligations of the Tenant hereunder, Tenant shall
          remain fully and primarily liable therefor and the liability of
          Tenant and such assignee (or subtenant, as the case may be) shall be
          joint and several. Further, and notwithstanding the foregoing, the
          provisions hereof shall not constitute a recognition of the assignment
          or the assignee thereunder or the sublease or the subtenant
          thereunder, as the case may be, and at Landlord's option, upon the
          termination or expiration of the Lease (whether such termination is
          based upon a cause beyond Tenant's control, a default of Tenant, the

                                      -30-
<PAGE>
          agreement of Tenant and Landlord or any other reason), the assignment
          or sublease shall be terminated.

          (B) As Additional Rent, Tenant shall reimburse Landlord promptly for
          reasonable out of pocket legal and other expenses incurred by Landlord
          in connection with any request by Tenant for consent to assignment or
          subletting.

          (C) If this Lease be assigned, or if the Premises or any part thereof
          be sublet or occupied by anyone other than Tenant, Landlord may upon
          prior notice to Tenant, at any time and from time to time, collect
          rent and other charges from the assignee, sublessee or occupant and
          apply the net amount collected to the rent and other charges herein
          reserved, but no such assignment, subletting, occupancy or collection
          shall be deemed a waiver of this covenant, or a waiver of the
          provisions of Sections 5.6 through 5.6.5 hereof, or the acceptance of
          the assignee, sublessee or occupant as a tenant or a release of Tenant
          from the further performance by Tenant of covenants on the part of
          Tenant herein contained, the Tenant herein named to remain primarily
          liable under this Lease.

          (D) No assignment or subletting under any of the provisions of
          Sections 5.6.1 or 5.6.2 shall in any way be construed to relieve
          Tenant from obtaining the express consent in writing to Landlord to
          any further assignment or subletting which would otherwise require
          Landlord's consent hereunder.

          (E) Without limiting Tenant's obligations under Section 3.3, Tenant
          shall be responsible, at Tenant's sole cost and expense, for
          performing all work necessary to comply with Legal Requirements and
          Insurance Requirements in connection with any assignment or subletting
          hereunder including, without limitation, any work in connection with
          such assignment or subletting.

5.7  To defend with counsel first approved by Landlord (which approval shall not
     be unreasonably withheld or delayed), save harmless, and indemnify Landlord
     from any liability for injury, loss, accident or damage to any person or
     property, and from any claims, actions, proceedings and expenses and costs
     in connection therewith (including without limitation reasonable counsel
     fees) (i) arising from (a) the omission, fault, willful act, negligence or
     other misconduct of Tenant or Tenant's contractors, licensees, invitees,
     agents, servants, independent contractors or employees or (b) any use made
     or thing done or occurring on the Premises not due to the omission, fault,
     willful act, negligence or other misconduct of Landlord, or,(ii) resulting
     from the failure of Tenant to perform and discharge its covenants and
     obligations under this Lease; to maintain commercial general liability
     insurance or comprehensive general liability insurance written on an
     occurrence

                                      -31-
<PAGE>
     basis with a broad form comprehensive liability endorsement covering the
     Premises insuring Landlord and Landlord's managing agent (and such persons
     as are in privity of estate with Landlord and Landlord's managing agent as
     may be set out in notice from time to time) as additional insureds as well
     as Tenant with limits which shall, at the commencement of the Term, be at
     least equal to those stated in Section 1.1 and from time to time during the
     Term shall be for such higher limits, if any, as are customarily carried in
     Greater Boston with respect to similar properties or which may reasonably
     be required by Landlord, and workmen's compensation insurance with
     statutory limits covering all of Tenant's employees working in the
     Premises, and to deposit with Landlord on or before the Commencement Date
     and concurrent with all renewals thereof, certificates for such insurance
     bearing the endorsement that the policies will not be canceled until after
     thirty (30) days' written notice to Landlord. All insurance required to be
     maintained by Tenant pursuant to this Lease shall be maintained with
     responsible companies qualified to do business, and in good standing, in
     the Commonwealth of Massachusetts and which have a rating of at least "A-"
     and are within a financial size category of not less than "Class VIII" in
     the most current Best's Key Rating Guide or such similar rating as may be
     reasonably selected by Landlord if such Guide is no longer published.

5.8  That all of the furnishings, fixtures, equipment, effects and property of
     every kind, nature and description of Tenant and of all persons claiming
     by, through or under Tenant which, during the continuance of this Lease or
     any occupancy of the Premises by Tenant or anyone claiming under Tenant,
     may be on the Premises or elsewhere in the Building or on the Site, shall
     be at the sole risk and hazard of Tenant, and if the whole or any part
     thereof shall be destroyed or damaged by fire, water or otherwise, or by
     the leakage or bursting of water pipes, steam pipes, or other pipes, by
     theft or from any other cause, no part of said loss or damage is to be
     charged to or be borne by Landlord, except that Landlord shall in no event
     be indemnified or held harmless or exonerated from any liability to Tenant
     or to any other person, for any injury, loss, damage or liability to the
     extent that such injury, loss, damage, or liability is due to Landlord's
     negligence or willful misconduct or to the extent such indemnity, hold
     harmless or exoneration is prohibited by law. Further, Tenant, at Tenant's
     expense, shall maintain at all times during the Term of this Lease
     insurance against loss or damage covered by so-called "all risk" type
     insurance coverage with respect to Tenant's fixtures, equipment, goods,
     wares and merchandise, tenant improvements made by or paid for by Tenant,
     and other property of Tenant (collectively, "Tenant's Property"). Such
     insurance shall be in an amount at least equal to the full replacement cost
     of Tenant's Property.

5.9  To permit Landlord and its agents to examine the Premises at reasonable
     times upon reasonable advance notice (except that no notice shall be
     required in an emergency) and, if Landlord shall so elect, to make any
     repairs or replacements Landlord may deem necessary; to remove, at Tenant's
     expense, any alterations, addition, signs, curtains, blinds, shades,
     awnings, aerials, flagpoles, or the like not

                                      -32-
<PAGE>
     consented to in writing; and to show the Premises to prospective tenants
     during the eleven (11) months preceding expiration of the Term and to
     prospective purchasers and mortgagees at all reasonable times.

5.10 Not to place a load upon the Premises exceeding an average rate of 70
     pounds of live load per square foot of floor area (partitions shall be
     considered as part of the live load); and not to move any safe, vault or
     other heavy equipment in, about or out of the Premises except in such
     manner and at such time as Landlord shall in each instance authorize;
     Tenant's business machines and mechanical equipment which cause vibration
     or noise that may be transmitted to the Building structure or to any other
     space in the Building shall be so installed, maintained and used by Tenant
     so as to eliminate such vibration or noise.

5.11 To pay promptly when due all taxes which may be imposed upon Tenant's
     Property in the Premises to whomever assessed.

5.12 To comply with all applicable Legal Requirements now or hereafter in force
     which shall impose a duty on Tenant relating to or as a result of the
     Tenant's use or occupancy of the Premises; provided that Tenant shall not
     be required to make any alterations or additions to the Building systems,
     structure, roof, exterior and load bearing walls, foundation, structural
     floor slabs and other structural elements of the Building unless the same
     are required by such Legal Requirements as a result of or in connection
     with Tenant's use or occupancy of the Premises beyond normal use of space
     of this kind. Tenant shall promptly pay all fines, penalties and damages
     that may arise out of or be imposed because of its failure to comply with
     the provisions of this Section 5.12.

5.13 As Additional Rent, to pay all reasonable costs, counsel and other fees
     incurred by Landlord in connection with the successful enforcement by
     Landlord of any obligations of Tenant under this Lease or in connection
     with any bankruptcy case involving Tenant or any guarantor.

                                   ARTICLE VI

                               CASUALTY AND TAKING

6.1  In case during the Lease Term the Building is damaged by fire or casualty
     and (i) such fire or casualty damage cannot, in the ordinary course,
     reasonably be expected to be repaired within one hundred twenty (120) days
     from the time that repair work would commence as reasonably determined by
     Landlord, or (ii) in any case where the holder of any mortgage which
     includes the Building as a part of the mortgaged premises or any ground
     lessor of any ground lease which includes the Site as part of the demised
     premises does not allow the net insurance proceeds to be applied to the
     restoration of the Building (and/or the Site), Landlord may, at its
     election, terminate this Lease by notice given to Tenant within sixty (60)
     days

                                      -33-
<PAGE>
     after the date of such fire or other casualty, specifying the effective
     date of termination. The effective date of termination specified by
     Landlord shall not be less than thirty (30) days nor more than forty-five
     (45) days after the date of notice of such termination.

     In case during the last year of the Lease Term, the Premises are damaged by
     fire or casualty and such fire or casualty damage cannot, in the ordinary
     course, reasonably be expected to be repaired within one hundred fifty
     (150) days (and/or as to special work or work which requires long lead time
     then if such work cannot reasonably be expected to be repaired within such
     additional time as is reasonable under the circumstances given the nature
     of the work) from the time that repair work would commence as reasonably
     determined by Landlord, Tenant may, at its election, terminate this Lease
     by notice given to Landlord within sixty (60) days after the date of such
     fire or other casualty, specifying the effective date of termination. The
     effective date of termination specified by Tenant shall be not less than
     thirty (30) days nor more than forty-five (45) days after the date of
     notice of such termination.

     In the event that the Lease is terminated pursuant to this Article VI, a
     just proportion of the Annual Fixed Rent, Tenant's share of Operating
     Costs, Tenant's share of real estate taxes and Tenant's Proportionate Share
     of electricity and HVAC according to the nature and extent of the injury to
     the Premises shall be abated from the date of such fire or other casualty
     until the effective termination date.

     Unless terminated pursuant to the foregoing provisions, this Lease shall
     remain in full force and effect following any such damage subject, however,
     to the following provisions.

     If the Building or any part thereof is damaged by fire or casualty and this
     Lease is not so terminated, or Landlord or Tenant have no right to
     terminate this Lease, Landlord promptly after such damage and the
     determination of the net amount of insurance proceeds available shall use
     due diligence to restore the Premises and the Building in the event of
     damage thereto (excluding Tenant's Property) into proper condition for use
     and occupation and a just proportion of the Annual Fixed Rent, Tenant's
     share of Operating Costs, Tenant's share of real estate taxes and Tenant's
     Proportionate Share of electricity and HVAC according to the nature and
     extent of the injury to the Premises shall be abated until the Premises
     shall have been put by Landlord substantially into such condition except
     for punch list items and long lead items. Notwithstanding anything herein
     contained to the contrary, Landlord shall not be obligated to expend for
     such repair and restoration any amount in excess of the net insurance
     proceeds.

     Where Landlord is obligated or otherwise elects to effect restoration of
     the Premises, unless such restoration is completed within nine (9) months
     from the

                                      -34-
<PAGE>
     date of the casualty or taking, such period to be subject, however, to
     extension where the delay in completion of such work is due to Force
     Majeure, as defined hereinbelow (but in no event beyond twelve (12) months
     from the date of the casualty or taking), Tenant shall have-the right to
     terminate this Lease at any time after the expiration of such nine-month
     (as extended) period until the restoration is substantially completed, such
     termination to take effect as of the thirtieth (30th) day after the date of
     receipt by Landlord of Tenant's notice, with the same force and effect as
     if such date were the date originally established as the expiration date
     hereof unless, within thirty (30) days after Landlord's receipt of Tenant's
     notice, such restoration is substantially completed, in which case Tenant's
     notice of termination shall be of no force and effect and this Lease and
     the Lease Term shall continue in full force and effect. When used herein,
     "Force Majeure" shall mean any prevention, delay or stoppage due to
     governmental regulation, strikes, lockouts, acts of God, acts of war,
     terrorists acts, civil commotions, unusual scarcity of or inability to
     obtain labor or materials, labor difficulties, casualty or other causes
     reasonably beyond Landlord's control or attributable to Tenant's action or
     inaction.

6.2  Notwithstanding anything to the contrary contained in this Lease, if the
     Building or the Premises shall be substantially damaged by fire or casualty
     as the result of a risk not covered by the forms of casualty insurance at
     the time maintained by Landlord and such fire or casualty damage cannot, in
     the ordinary course, reasonably be expected to be repaired within thirty
     (30) days from the time that repair work would commence, Landlord may, at
     its election, terminate the Term of this Lease by notice to the Tenant
     given within thirty (30) days after such loss. If Landlord shall give such
     notice, then this Lease shall terminate as of the date of such notice with
     the same force and effect as if such date were the date originally
     established as the expiration date hereof.

6.3  If the entire Building, or such portion of the Premises or access thereto
     as to render the balance (if reconstructed to the maxim extent practicable
     in the circumstances) unsuitable for Tenant's purposes, shall be taken by
     condemnation or right of eminent domain, Landlord or Tenant shall have the
     right to terminate this Lease by notice to the other of its desire to do
     so, provided that such notice is given not later than thirty (30) days
     after Tenant has been deprived of possession. If either party shall give
     such notice, then this Lease shall terminate as of the date of such notice
     with the same force and effect as if such date were the date originally
     established as the expiration date hereof.

     Further, if (i) so much of the Building or Site shall be so taken that
     continued operation of the Building would be uneconomic as a result of the
     taking, or (ii) the holder of any mortgage which includes the Premises as
     part of the mortgaged premises or any ground lessor of any ground lease
     which includes the Site as part of the demised premises does not allow the
     net condemnation proceeds to be applied to the restoration of the Building,
     Landlord shall have the right to

                                      -35-
<PAGE>
     terminate this Lease by giving notice to Tenant of Landlord's desire to do
     so not later than thirty (30) days after Tenant has been deprived of
     possession of the Premises (or such portion thereof as may be taken). If
     Landlord shall give such notice, then this Lease shall terminate as of the
     date of such notice with the same force and effect as if such date were the
     date originally established as the expiration date hereof.

     Should any part of the Premises be so taken or condemned during the Lease
     Term hereof, and should this Lease not be terminated in accordance with the
     foregoing provisions, Landlord agrees that after the determination of the
     net amount of condemnation proceeds available to Landlord, Landlord shall
     use due diligence to put what may remain of the Premises into proper
     condition for use and occupation as nearly like the condition of the
     Premises prior to such taking as shall be practicable (excluding Tenant's
     Property). Notwithstanding the foregoing, Landlord shall not be obligated
     to expend for such repair and restoration any amount in excess of the net
     condemnation proceeds made available to it.

     If the Premises or the access thereto shall be affected by any exercise of
     the power of eminent domain, then the Annual Fixed Rent, Tenant's share of
     Operating Costs, Tenant's share of real estate taxes and Tenant's
     Proportionate Share of electricity and HVAC shall be justly and equitably
     abated and reduced according to the nature and extent of the loss of use
     thereof suffered by Tenant; and in case of a taking which permanently
     reduces the Rentable Floor Area of the Premises, a just proportion of the
     Annual Fixed Rent, Tenant's share of operating costs and Tenant's share of
     real estate taxes shall be abated for the remainder of the Lease Term.

6.4  Landlord shall have and hereby reserves to itself any and all rights to
     receive awards made for damages to the Premises, the Buildings, the Complex
     and the Site and the leasehold hereby created, or any one or more of them,
     accruing by reason of exercise of eminent domain or by reason of anything
     lawfully done in pursuance of public or other authority. Tenant hereby
     grants, releases and assigns to Landlord all Tenant's rights such awards,
     and covenants to execute and deliver such further assignments and
     assurances thereof as Landlord may from time to time request.

     Nothing contained herein shall be construed to prevent Tenant from
     prosecuting in any condemnation proceeding a claim for the value of any of
     Tenant's usual trade fixtures installed in the Premises by Tenant at
     Tenant's expense and for relocation and moving expenses, provided that such
     action and any resulting award shall not affect or diminish the amount of
     compensation otherwise recoverable by Landlord from the taking authority.

                                  ARTICLE VII

                                      -36-
<PAGE>
                                     DEFAULT

7.1  (a)  If at any time subsequent to the date of this Lease any one or more of
          the following events (herein sometimes called an "Event of Default")
          shall occur:

          (i) Tenant shall fail to pay any installment of the Annual Fixed Rent,
     Additional Rent or other charges for which provision is made herein on or
     before the date on which the same become due and payable, and the same
     continues for ten (10) days after notice from Landlord thereof, or

          (ii) Landlord having rightfully given the notice specified in
     subdivision (a) above twice in any calendar year, Tenant shall thereafter
     in the same calendar year fail to pay the Annual Fixed Rent, Additional
     Rent or any other monetary amount due under this Lease on or before the
     date on which the same become due and payable, or,

          (iii) Tenant shall assign its interest in this Lease or sublet any
     portion of the Premises in violation of the requirements of Sections 5.6
     through 5.6.5 of this Lease, or

          (iv) Tenant shall fail to perform or observe some term or condition
     of this Lease which, because of its character, would immediately
     jeopardize Landlord's interest (such as, but without limitation, failure to
     maintain general liability insurance, or the employment of labor and
     contractors within the Premises which interfere with Landlord's work, in
     violation of Section 3.3), and such failure continues for five (5) days
     after notice from Landlord to Tenant thereof; or

          (v) Tenant shall neglect or fail to perform or observe any other
     requirement, term, covenant or condition of this Lease (not hereinabove in
     this Section 7.1(a) specifically referred to) on Tenant's part to be
     performed or observed and Tenant shall fail to remedy the same within
     thirty (30) days after notice to Tenant specifying such neglect or failure,
     or if such neglect or failure is of such a nature that Tenant cannot
     reasonably remedy the same within such thirty (30) day period, Tenant shall
     fail to commence promptly to remedy the same and to prosecute such remedy
     to completion with diligence and continuity; or

          (vi) Tenant's leasehold interest in the Premises shall be taken on
     execution or by other process of law directed against Tenant; or

          (vii) Tenant shall make an assignment for the benefit of creditors or
     shall file a voluntary petition in bankruptcy or shall be adjudicated
     bankrupt or insolvent, or shall file any petition or answer seeking any
     reorganization, arrangement, composition, readjustment, liquidation,
     dissolution or similar relief

                                      -37-

<PAGE>
     for itself under any present or future Federal, State or other statute, law
     or regulation for the relief of debtors, or shall seek or consent to or
     acquiesce in the appointment of any trustee, receiver or liquidator of
     Tenant or of all or any substantial part of its properties, or shall admit
     in writing its inability to pay its debts generally as they become due; or

          (viii) A petition shall be filed against Tenant in bankruptcy or under
     any other law seeking any reorganization, arrangement, composition,
     readjustment, liquidation, dissolution, or similar relief under any present
     or future Federal, State on other statute, law or regulation and shall
     remain undismissed or unstayed for an aggregate of sixty (60) days (whether
     or not consecutive), or if any debtor in possession (whether or not Tenant)
     trustee, receiver or liquidator of Tenant or of all or any substantial part
     of its properties or of the Premises shall be appointed without the consent
     or acquiescence of Tenant and such appointment shall remain unvacated or
     unstayed for an aggregate of sixty (60) days (whether or not consecutive).

     then, and in any of said cases (notwithstanding any license of a former
     breach of covenant or waiver of the benefit hereof or consent in a former
     instance), Landlord lawfully may, immediately or at any time thereafter,
     and without demand or further notice of default terminate this Lease by
     notice to Tenant, specifying a date not less than five (5) days after the
     giving of such notice on which this Lease shall terminate, and this Lease
     shall come to an end on the date specified therein as fully and completely
     as if such date were the date herein originally fixed for the expiration of
     the Lease Term (Tenant hereby waiving any rights of redemption), and Tenant
     will then quit and surrender the Premises to Landlord, but Tenant shall
     remain liable as hereinafter provided.

     (b) If this Lease shall have been terminated as provided in this Article,
     then Landlord may, without notice, re-enter the Premises, either by force,
     summary proceedings, ejectment or otherwise, and remove and dispossess
     Tenant and all other persons and any and all property from the same, as if
     this Lease had not been made, and Tenant hereby waives the service of
     notice of intention to re-enter.

     (c) In the event that this Lease is terminated under any of the provisions
     contained in Section 7.1(a) or shall be otherwise terminated by breach of
     any obligation of Tenant, Tenant covenants and agrees forthwith to pay and
     be liable for, on the days originally fixed herein for the payment thereof,
     amounts equal to the several installments of rent and other charges
     reserved as they would, under the terms of this Lease, become due if this
     Lease had not been terminated or if Landlord had not entered or re-entered,
     as aforesaid, and whether the Premises be relet or remain vacant, in whole
     or in part, or for a period less than the remainder of the Term, and for
     the whole thereof, but in the event the Premises be relet by Landlord,
     Tenant shall be entitled to a credit in the net amount of rent and other

                                      -38-

<PAGE>
     charges received by Landlord in reletting, after deduction of all expenses
     incurred in reletting the Premises (including, without limitation,
     remodeling costs, brokerage fees and the like), and in collecting the rent
     in connection therewith, in the following manner:

     Amounts received by Landlord after reletting shall first be applied against
     such Landlord's expenses, until the same are recovered, and until such
     recovery, Tenant shall pay, as of each day when a payment would fall due
     under this Lease, the amount which Tenant is obligated to pay under the
     terms of this Lease (Tenant's liability prior to any such reletting and
     such recovery not in any way to be diminished as a result of the fact that
     such reletting might be for a rent higher than the rent provided for in
     this Lease); when and if such expenses have been completely recovered, the
     amounts received from reletting by Landlord as have not previously been
     applied shall be credited against Tenant's obligations as of each day when
     a payment would fall due under this Lease, and only the net amount thereof
     shall be payable by Tenant. Further, amounts received by Landlord from such
     reletting for any period shall be credited only against obligations of
     Tenant allocable to such period, and shall not be credited against
     obligations of Tenant hereunder accruing subsequent or prior to such
     period; nor shall any credit of any kind be due for any period after the
     date when the term of this Lease is scheduled to expire according to its
     terms.

     (d)  (i) Landlord may elect, as an alternative, to have Tenant pay
          liquidated damages, which election may be made by notice given to
          Tenant at any time after the termination of this Lease under this
          Section 7.1, above, and whether or not Landlord shall have collected
          any damages as hereinbefore provided in this Article VII, and in lieu
          of all other such damages beyond the date of such notice. Upon such
          notice, Tenant shall promptly pay to Landlord, as liquidated damages,
          in addition to any damages collected or due from Tenant from any
          period prior to such notice and all expenses which Landlord may have
          incurred with respect to the collection of such damages, such a sum as
          at the time of such notice represents the amount of such excess, if
          any, of (a) the discounted present value, at a discount rate of 6%, of
          the Annual Fixed Rent, Additional Rent and other charges which would
          have been payable by Tenant under this Lease for the remainder of the
          Lease Term if the Lease terms had been fully complied with by Tenant,
          over and above (b) the discounted present value, at a discount rate of
          6%, of the Annual Fixed Rent, Additional Rent and other charges that
          would be received by Landlord if the Premises were re-leased at the
          time of such notice for the remainder of the Lease Term at the fair
          market value (including provisions regarding periodic increases in
          Annual Fixed Rent if such are applicable) prevailing at the time of
          such notice as reasonably determined by Landlord.

                                      -39-
<PAGE>
          (ii) For the purposes of this Article, if Landlord elects to require
          Tenant to pay damages in accordance with the immediately preceding
          paragraph, the total rent shall be computed by assuming that Tenant's
          share of excess taxes, Tenant's share of excess operating costs and
          Tenant's share of excess electrical costs would be, for the balance of
          the unexpired Term from the date of such notice, the amount thereof
          (if any) for the immediately preceding annual period payable by Tenant
          to Landlord.

     (e) In case of any Event of Default, re-entry, dispossession by summary
     proceedings or otherwise, Landlord may (i) re-let the Premises or any part
     or parts thereof, either in the name of Landlord or otherwise, for a term
     or terms which may at Landlord's option be equal to or less than or exceed
     the period which would otherwise have constituted the balance of the Term
     of this Lease and may grant concessions or free rent to the extent that
     Landlord considers advisable or necessary to re-let the same and (ii) may
     make such alterations, repairs and decorations in the Premises as Landlord
     in its sole judgment considers advisable or necessary for the purpose of
     reletting the Premises; and the making of such alterations, repairs and
     decorations shall not operate or be construed to release Tenant from
     liability hereunder as aforesaid. Landlord shall in no event be liable in
     any way whatsoever for failure to re-let the Premises, or, in the event
     that the Premises are re-let, for failure to collect the rent under
     re-letting. Tenant, for itself and any and all persons claiming through or
     under Tenant, including its creditors, upon the termination of this Lease
     and of the term of this Lease in accordance with the terms hereof, or in
     the event of entry of judgment for the recovery of the possession of the
     Premises in any action or proceeding, or if Landlord shall enter the
     Premises by process of law or otherwise, hereby waives any right of
     redemption provided or permitted by any statute, law or decision now or
     hereafter in force, and does hereby waive, surrender and give up all rights
     or privileges which it or they may or might have under and by reason of any
     present or future law or decision, to redeem the Premises or for a
     continuation of this Lease for the term of this Lease hereby demised after
     having been dispossessed or ejected therefrom by process of law, or
     otherwise.

     Landlord agrees to use reasonable efforts to relet the Premises after
     Tenant vacates the Premises in the event that the Lease is terminated based
     upon a default by Tenant hereunder. Marketing of Tenant's Premises in a
     manner similar to the manner in which Landlord markets other premises
     within Landlord's control in the Complex shall be deemed to have satisfied
     Landlord's obligation to use "reasonable efforts." In no event shall
     Landlord be required to (i) solicit or entertain negotiations with any
     other prospective tenants for the Premises until Landlord obtains full and
     complete possession of the Premises including, without limitation, the
     final and unappealable legal right to re-let the Premises free of any claim
     of Tenant, (ii) give preference to reletting the Premises over leasing
     other vacant space in the Building, or (iii) lease the Premises if, in
     Landlord's bona fide

                                      -40-
<PAGE>
     business judgment, the proposed rent is less than the then current fair
     market rental value of the Premises.

     (f) The specified remedies to which Landlord may resort hereunder are not
     intended to be exclusive of any remedies or means of redress to which
     Landlord may at any time be entitled lawfully, and Landlord may invoke any
     remedy (including the remedy of specific performance) allowed at law or in
     equity as if specific remedies were not herein provided for. Further,
     nothing contained in this Lease shall limit or prejudice the right of
     Landlord to prove for and obtain in proceedings for bankruptcy or
     insolvency by reason of the termination of this Lease, an amount equal to
     the maximum allowed by any statute or rule of law in effect at the time
     when, and governing the proceedings in which, the damages are to be proved,
     whether or not the amount be greater, equal to, or less than the amount of
     the loss or damages referred to above.

7.2  Landlord shall in no event be in default in the performance of any of
     Landlord's obligations hereunder unless and until Landlord shall have
     failed to perform such obligations within thirty (30) days, or such
     additional time as is reasonably required to correct any such default,
     after notice by Tenant to Landlord properly specifying wherein Landlord has
     failed to perform any such obligation.

                                  ARTICLE VIII

                                  MISCELLANEOUS

8.1  Tenant covenants and agrees that Tenant will not do or permit anything to
     be done in or upon the Premises, or bring in anything or keep anything
     therein, which shall increase the rate of insurance on the Premises or on
     the Building above the standard rate applicable to premises being occupied
     for the use to which Tenant has agreed to devote the Premises; and Tenant
     further agrees that, in the event that Tenant shall do any of the
     foregoing, Tenant will promptly pay to Landlord, on demand, any such
     increase resulting therefrom, which shall be due and payable as additional
     rent thereunder.

8.2  Failure on the part of Landlord or Tenant to complain of any action
     or non-action on the part of the other, no matter how long the same may
     continue, shall never be a waiver by Tenant or Landlord, respectively, of
     any of its rights hereunder. Further, no waiver at any time of any of the
     provisions hereof by Landlord or Tenant shall be construed as a waiver of
     any of the other provisions hereof, and a waiver at any time of any of the
     provisions hereof shall not be construed as a waiver at any subsequent time
     of the same provisions. The consent or approval of Landlord or Tenant to or
     of any action by the other requiring such consent or approval shall not be
     construed to waive or render unnecessary Landlord's or Tenant's consent or
     approval to or of subsequent similar act by the other. Further, the
     acceptance by Landlord of Annual Fixed Rent, Additional Rent or any other
     charges paid by Tenant under this Lease shall not be or be deemed to be a
     waiver

                                      -41-
<PAGE>
     by Landlord of any default by Tenant, whether or not Landlord knows of such
     default, except for such defaults as to which such payment relates.

     No payment by Tenant, or acceptance by Landlord, of a lesser amount than
     shall be due from Tenant to Landlord shall be treated otherwise than as a
     payment on account. The acceptance by Landlord of a check for a lesser
     amount with an endorsement or statement thereon, or upon any letter
     accompanying such check, that such lesser amount is payment in full, shall
     be given no effect, and Landlord may accept such check without prejudice to
     any other rights or remedies which Landlord may have against Tenant.

8.3  The specific remedies to which Landlord may resort under the terms of this
     Lease are cumulative and are not intended to be exclusive of any other
     remedies or means of redress to which such party may be lawfully entitled
     in case of any breach or threatened breach by Tenant of any provisions of
     this Lease. In addition to the other remedies provided in this Lease,
     Landlord shall be entitled to the restraint by injunction of the violation
     or attempted or threatened violation of any of the covenants, conditions or
     provisions of this Lease or to a decree compelling specific performance of
     any such covenants, conditions or provisions.

8.4  Tenant, subject to the terms and provisions of this Lease and with the
     benefit of any applicable grace periods provided for in this Lease on
     payment of the rent and observing, keeping and performing all of the terms
     and provisions of this Lease on Tenant's part to be observed, kept and
     performed, shall lawfully, peaceably and quietly have, hold, occupy and
     enjoy the Premises during the Term (exclusive of any period during which
     Tenant is holding over after the expiration or termination of this Lease
     without the consent of Landlord), without hindrance or ejection by any
     persons lawfully claiming under Landlord to have title to the Premises
     superior to Tenant, subject, however, to the terms of this Lease; the
     foregoing covenant of quiet enjoyment is in lieu of any other covenant,
     express or implied; and it is understood and agreed that this covenant and
     any and all other covenants of Landlord contained in this Lease shall be
     binding upon Landlord and Landlord's successors only with respect to
     breaches occurring during Landlord's or Landlord's successors' respective
     ownership of Landlord's interest hereunder, including ground or master
     lessees, to the extent of their respective interests, as and when they
     shall acquire same and then only for so long as they shall retain such
     interest.

     Further, Tenant specially agrees to look solely to Landlord's then equity
     interest in the Building at the time owned, or in which Landlord holds
     an interest as ground lessee, for recovery of any judgment from Landlord;
     it being specifically agreed that neither Landlord (original or successor),
     nor any beneficiary of any Trust of which any person holding Landlord's
     interest is Trustee, nor any member, manager, partner, director or
     stockholder nor Landlord's managing agent shall ever be personally liable
     for any such judgment, or for the payment of any

                                      -42-
<PAGE>
     monetary obligation to Tenant. The provision contained in the foregoing
     sentence is not intended to, and shall not, limit any right that Tenant
     might otherwise have to obtain injunctive relief against Landlord or
     Landlord's successors in interest, or any action not involving the personal
     liability of Landlord (original or successor), any successor Trustee to the
     persons named herein as Landlord, or any beneficiary of any Trust of which
     any person holding Landlord's interest is Trustee, or of any manager,
     member, partner, director or stockholder of Landlord or of Landlord's
     managing agent, to respond in monetary damages from Landlord's assets other
     than Landlord's equity interest aforesaid in the Building. In no event
     shall Landlord ever be liable to Tenant for any indirect or consequential
     damages or lost profits suffered by Tenant from whatever cause or loss of
     profits or the like. In the event that Landlord shall be determined to have
     acted unreasonably in withholding any consent or approval under this Lease,
     the sole recourse and remedy of the Tenant in respect thereof shall be to
     specifically enforce Landlord's obligation to grant such consent or
     approval, and in no event shall the Landlord be responsible for any damages
     of whatever nature in respect of its failure to give such consent or
     approval nor shall the same otherwise affect the obligations of the Tenant
     under this Lease or act as any termination of this Lease.

8.5  After receiving notice from any person, firm or other entity that it holds
     a mortgage which includes the Premises as part of the mortgaged premises,
     or that it is the ground lessor under a lease with Landlord, as ground
     lessee, which includes the Premises as a part of the mortgaged premises, no
     notice from Tenant to Landlord shall be effective unless and until a copy
     of the same is given to such holder or ground lessor, and the curing of any
     of Landlord's defaults by such holder or ground lessor within a reasonable
     time thereafter (including a reasonable time to obtain possession of the
     premises if the mortgagee or ground lessor elects to do so) shall be
     treated as performance by Landlord. For the purposes of this Section 8.5 or
     Section 8.15, the term "mortgage" includes a mortgage on a leasehold
     interest of Landlord (but not one on Tenant's leasehold interest). If any
     mortgage is listed on Exhibit F then the same shall constitute notice from
     the holder of such mortgage for the purposes of this Section 8.5. Further
     no Annual Fixed Rent or Additional Rent may be paid by Tenant more than
     thirty (30) days in advance except with the prior written consent of all
     holder(s) of such mortgages and ground leases, and any such payment without
     such consent shall not be binding on such holder(s).

8.6  With reference to any assignment by Landlord of Landlord's interest in this
     Lease, or the rents payable hereunder, conditional in nature or otherwise,
     which assignment is made to the holder of a mortgage or ground lease on
     property which includes the Premises, Tenant agrees:

     (a)  That the execution thereof by Landlord, and the acceptance thereof by
          the holder of such mortgage or the ground lessor, shall never be
          treated as an assumption by such holder or ground lessor of any of the
          obligations of Landlord

                                      -43-
<PAGE>
          hereunder, unless such holder, or ground lessor, shall, by notice sent
          to Tenant, specifically otherwise elect; and

     (b)  That, except as aforesaid, such holder or ground lessor shall be
          treated as having assumed Landlord's obligations hereunder only upon
          foreclosure of such holder's mortgage and the taking of possession of
          the Premises, or, in the case of a ground lessor, the assumption of
          Landlord's position hereunder by such ground lessor. Tenant
          acknowledges that it has been informed by Landlord that Landlord has
          entered into certain agreements with its lenders ("Lenders") which
          require it to include in this Lease (and requires Tenant to include in
          any sublease which may be permitted hereunder) the following
          provisions: (i) no rent payable under this Lease or under any such
          sublease may be based in whole or in part on the income or profits
          derived from the Premises or any subleased premises except for
          percentage rent based on gross (not net) receipts or sales; (ii) if
          Lenders succeed to the Landlord's interests under this Lease and are
          advised by Lenders' counsel that all or any portion of the rent
          payable under this Lease is or may be deemed to be unrelated business
          income within the meaning of the Internal Revenue Code of the 1986, as
          amended, or the regulations issued thereunder, Lenders may elect to
          amend unilaterally the calculation of rents under this Lease so that
          none of the rents payable to Lenders under this Lease will constitute
          unrelated business income, provided that such amendment will not
          increase the Tenant's payment obligations or other liability under
          this Lease or reduce the Landlord's obligations under this Lease; and
          (iii) if Lenders request, Tenant will be obligated to execute any
          document Lenders may deem necessary to effect the amendment of this
          Lease in accordance with the foregoing subsection (ii). Further, no
          Annual Fixed Rent or Additional Rent may be paid by Tenant more than
          thirty (30) days in advance except with Lenders' prior written
          consent, and any such payment without such consent shall not be
          binding on Lenders.

          In no event shall the acquisition of title to the Building and the
          land on which the same is located by a purchaser which, simultaneously
          therewith, leases the entire Building or such land back to the seller
          thereof be treated as an assumption by such purchaser-lessor, by
          operation of law or otherwise, of Landlord's obligations hereunder,
          but Tenant shall look solely to such seller-lessee, and its successors
          from time to time in title, for performance of Landlord's obligations
          hereunder subject to the provisions of Section 8.4 hereof. In any such
          event, this Lease shall be subject and subordinate to the lease to
          such purchaser provided that such purchaser agrees to recognize the
          right of Tenant to use and occupy the Premises pursuant to this Lease
          upon the payment of rent and other charges payable by Tenant under
          this Lease and the performance by Tenant of Tenant's obligations
          hereunder and provided that Tenant agrees to attorn to such purchaser.
          For all purposes, such seller-lessee, and its successors in title,
          shall be the landlord hereunder unless and until Landlord's position
          shall have been assumed by such purchaser-lessor.

                                      -44-

<PAGE>
8.7  (A) No act or thing done by Landlord during the Lease Term shall be deemed
     an acceptance of a surrender of the Premises, and no agreement to accept
     such surrender shall be valid, unless in writing signed by Landlord. No
     employee of Landlord or of Landlord's agents shall have any power to accept
     the keys of the Premises prior to the termination of this Lease, provided,
     however, that the foregoing shall not apply to the delivery of keys to
     Landlord or its agents in its (or their) capacity as managing agent or for
     purpose of emergency access. In any event, however, the delivery of keys to
     any employee of Landlord or of Landlord's agents shall not operate as a
     termination of the Lease or a surrender of the Premises.

     (B) Upon the expiration or earlier termination of the Lease Term, Tenant
     shall surrender the Premises to Landlord in the condition as required by
     Sections 3.3 and 5.2, first removing all goods and effects of Tenant and
     completing such other removals as may be permitted or required pursuant to
     Section 5.2.

8.8  (A) Tenant warrants and represents that Tenant has not dealt with any
     broker in connection with the consummation of this Lease other than the
     broker, person or firm, if any, designated in Section 1.1 hereof; and in
     the event any claim is made against the Landlord relative to dealings by
     Tenant with brokers other than the Brokers, if any, designated in Section
     1.1 hereof, Tenant shall defend the claim against Landlord with counsel of
     Tenant's selection first approved by Landlord (which approval will not be
     unreasonably withheld) and save harmless and indemnify Landlord on account
     of loss, cost or damage which may arise by reason of such claim.

     (B) Landlord warrants and represents that Landlord has not dealt with any
     broker in connection with the consummation of this Lease other than the
     broker, person or firm, if any, designates in Section 1.1 hereof; and in
     the event any claim is made against the Tenant relative to dealings by
     Landlord with brokers other than the Brokers, if any, designated in Section
     1.1 hereof, Landlord shall defend the claim against Tenant with counsel of
     Landlord's selection and save harmless and indemnify Tenant on account of
     loss, cost or damage which may arise by reason of such claim. Landlord
     agrees that it shall be solely responsible for the payment of brokerage
     commissions to the Brokers, if any, designated in Section 1.1 hereof.

8.9  If any term or provision of this Lease, or the application thereof to any
     person or circumstance shall, to any extent, be invalid or unenforceable,
     the remainder of this Lease, or the application of such term or provision
     to persons or circumstances other than those to which it is held invalid or
     unenforceable, shall not be affected thereby, and each term and provision
     of this Lease shall be valid and be enforced to the fullest extent
     permitted by law.

                                      -45-
<PAGE>
8.10 The obligations of this Lease shall run with the land, and except as herein
     otherwise provided, the terms hereof shall be binding upon and shall inure
     to the benefit of the successors and assigns, respectively, of Landlord and
     Tenant and, if Tenant shall be an individual, upon and to his heirs,
     executors, administrators, successors and assigns. Each term and each
     provision of this Lease to be performed by Tenant shall be construed to be
     both a covenant and a condition. The reference contained to successors and
     assigns of Tenant is not intended to constitute a consent to subletting or
     assignment by Tenant, but has reference only to those instances in which
     Landlord may have later given consent to a particular assignment as
     required by the provisions of Article V hereof or such assignment is
     otherwise permitted under Article V.

8.11 Tenant agrees not to record the within Lease, but each party hereto agrees,
     on the request of the other, to execute a so-called Notice of Lease or
     short form lease in form recordable and complying with applicable law and
     reasonably satisfactory to both Landlord's and Tenant's attorneys. In no
     event shall such document set forth rent or other charges payable by Tenant
     under this Lease; and any such document shall expressly state that it is
     executed pursuant to the provisions contained in this Lease, and is not
     intended to vary the terms and conditions of this Lease.

8.12 Whenever, by the terms of this Lease, notice shall or may be given either
     to Landlord or to Tenant, such notice shall be in writing and shall be sent
     by registered or certified mail, return receipt requested, postage prepaid:

     If intended for Landlord, addressed to Landlord at the address set forth on
     the first page of this Lease (or to such other address or addresses as may
     from time to time hereafter be designated by Landlord by like notice) with
     a copy to Landlord, Attention: General Counsel.

     If intended for Tenant, addressed to Tenant at the address set forth on the
     second page of this Lease except that from and after the Commencement Date
     the address of Tenant shall be the Premises, Attention: Gail Goodman (or to
     such other address or addresses as may from time to time hereafter be
     designated by Tenant by like notice), with a copy to Thomas Durkin, Esq.,
     Lucash, Gesmer & Updegrove LLP, 40 Broad Street, Boston, MA 02109.

     Except as otherwise provided herein, all such notices shall be effective
     when received; provided, that (i) if receipt is refused, notice shall be
     effective upon the first occasion that such receipt is refused or (ii) if
     the notice is unable to be delivered due to a change of address of which no
     notice was given, notice shall be effective upon the date such delivery was
     attempted.

     Where provision is made for the attention of an individual or department,
     the notice shall be effective only if the wrapper in which such notice is
     sent is addressed to the attention of such individual or department.

                                      -46-
<PAGE>
     Any notice given by an attorney on behalf of Landlord or by Landlord's
     managing agent shall be considered as given by Landlord and shall be fully
     effective.

     Time is of the essence with respect to any and all notices and periods for
     giving notice or, taking any action thereto under this Lease.

8.13 Employees or agents of Landlord have no authority to make or agree to make
     a lease or any other agreement or undertaking in connection herewith. The
     submission of this document for examination and negotiation does not
     constitute an offer to lease, or a reservation of, or option for, the
     Premises, and this document shall become effective and binding only upon
     the execution and delivery hereof by both Landlord and Tenant. All
     negotiations, considerations, representations and understandings between
     Landlord and Tenant are incorporated herein and may be modified or altered
     only by written agreement between Landlord and Tenant, and no act or
     omission of any employee or agent of Landlord shall alter, change or modify
     any of the provisions hereof.

8.14 The titles of the Articles throughout this Lease are for convenience and
     reference only, and the words contained therein shall in no way be held to
     explain, modify, amplify or aid in the interpretation, construction or
     meaning of the provisions of this Lease.

8.15 This Lease shall be subject and subordinate to any mortgage now or
     hereafter on the Site or the Building, or both, and to each advance made or
     hereafter to be made under any mortgage, and to all renewals,
     modifications, consolidations, replacements and extensions thereof and all
     substitutions therefor provided that in the case of a future mortgage the
     holder of such mortgage agrees to recognize the rights of Tenant under this
     Lease (including the right to use and occupy the Premises) upon the payment
     of rent and other charges payable by Tenant under this Lease and the
     performance by Tenant of Tenant's obligations hereunder. In confirmation of
     such subordination and recognition, Tenant shall execute and deliver
     promptly such instruments of subordination and recognition as such
     mortgagee may reasonably request. In the event that any mortgagee or its
     respective successor in title shall succeed to the interest of Landlord,
     then, this Lease shall nevertheless continue in full force and effect and
     Tenant shall and does hereby agree to attorn to such mortgagee or successor
     and to recognize such mortgagee or successor as its landlord. If any holder
     of a mortgage which includes the Premises, executed and recorded prior to
     the date of this Lease, shall so elect, this Lease and the rights of Tenant
     hereunder, shall be superior in right to the rights of such holder, with
     the same force and effect as if this Lease had been executed, delivered and
     recorded, or a statutory Notice hereof recorded, prior to the execution,
     delivery and recording of any such mortgage. The election of any such
     holder shall become effective upon either notice from such holder to Tenant
     it the same fashion as notices from Landlord to Tenant are to be given
     hereunder

                                      -47-
<PAGE>
     or by the recording in the appropriate registry or recorder's office of an
     instrument in which such holder subordinates its rights under such mortgage
     to this Lease. Tenant hereby appoints such mortgagee (from time to time) as
     Tenant's attorney-in-fact to execute such subordination and recognition in
     the following circumstances:

     1.   Landlord, such mortgagee, or ground lessor ("Requesting Party") shall
          have given Tenant a written request ("First Request") therefore,
          stating that if Tenant does not timely execute and deliver such
          certificate or instrument, the mortgagee or ground lessor may act as
          Tenant's attorney-in-fact in accordance with this Section 8.15;

     2.   Tenant shall fail to execute and deliver such certificate or
          instrument or provide Landlord with notice of its objections to the
          form of such certificate or instrument within ten (10) days of the
          First Request;

     3.   The Requesting Party shall, after the expiration of such ten (10) day
          period, have given Tenant another request ("Second Request") therefor,
          stating that Tenant has failed timely to respond to the First Request
          for such certificate or instrument and that if Tenant does not execute
          and deliver such certificate or instrument within ten (10) days of the
          Second Request, the mortgagee or ground lessor may act as Tenant's
          attorney-in-fact in accordance with this Section 8.15; and

     4.   Tenant shall fail to execute and deliver such certificate or
          instrument or provide Landlord with notice of its objections to the
          form of such certificate or instrument within ten (10) days of the
          Second Request.

     Notwithstanding the foregoing, upon written request by Tenant, Landlord
     will use reasonable efforts to obtain a non-disturbance, subordination and
     attornment agreement from Landlord's then current mortgagee on such
     mortgagee's then current standard form of agreement. "Reasonable efforts"
     of Landlord shall not require Landlord to incur any cost, expense or
     liability to obtain such agreement, it being agreed that Tenant shall be
     responsible for any fee or review costs charged by the mortgagee. Upon
     request of Landlord, Tenant will execute the mortgagee's form of
     non-disturbance, subordination and attornment agreement and return the same
     to Landlord for execution by the mortgagee. Landlord's failure to obtain a
     non-disturbance, subordination and attornment agreement for Tenant shall
     have no effect on the rights, obligations and liabilities of Landlord and
     Tenant to be considered to be a default by Landlord hereunder.

8.16 Recognizing that Landlord may find it necessary to establish to third
     parties, such as accountants, banks, potential or existing mortgagees,
     potential purchasers or the like, the then current status of performance
     hereunder, Tenant, within ten (10) days after the request of landlord made
     from time to time, will furnish to

                                      -48-

<PAGE>
     Landlord, or any existing or potential holder of any mortgage encumbering
     the Premises, the Building, the Site and/or the Complex or any potential
     purchaser of the Premises, the Building, the Site and/or the Complex, (each
     an "Interested Party"), a statement of the status of any matter pertaining
     to this Lease, including, without limitation, acknowledgments that (or the
     extent to which) each party is in compliance with its obligations under the
     terms of this Lease. In addition, Tenant shall deliver to Landlord, or any
     Interested Party designated by Landlord, financial statements of Tenant and
     any guarantor of Tenant's obligations under this Lease, as reasonably
     requested by Landlord, including, but not limited to financial statements
     for the past three (3) years. Upon written request by Tenant, Landlord and
     any party receiving such statements from Landlord shall, prior to delivery
     of such statements, enter into a commercially reasonable confidentiality
     agreement covering any confidential information that is disclosed by
     Tenant. Any such status statement or financial statement delivered by
     Tenant pursuant to this Section 8.16 may be relied upon by any Interested
     Party.

8.17 If Tenant shall at any time default in the performance of any obligation
     under this Lease, Landlord shall have the right, but shall not be
     obligated, to enter upon the Premises and to perform such obligation
     notwithstanding the fact that no specific provision for such substituted
     performance by Landlord is made in this Lease with respect to such default.
     In performing such obligation, Landlord may make any payment of money or
     perform any other act. All sums so paid by Landlord (together with interest
     at the rate of two and one-half percentage points over the then prevailing
     prime or base rate in Boston as set by Fleet Bank, N.A., or its successor)
     (but in no event greater than the maximum rate permitted by applicable law)
     and all costs and expenses in connection with the performance of any such
     act by Landlord, shall be deemed to be additional rent under this Lease and
     shall be payable to Landlord immediately on demand. Landlord may exercise
     the foregoing rights without waiving any other of its rights or releasing
     Tenant from any of its obligations under this Lease.

8.18 Any holding over by Tenant after the expiration of the term of this Lease
     shall be treated as a tenancy at sufferance and shall be on the terms and
     conditions as set forth in this Lease, as far as applicable except that
     Tenant shall pay as a use and occupancy charge an amount equal to the
     greater of (x) the Holdover Percentage, as hereinafter defined, of the
     Annual Fixed Rent and Additional Rent calculated (on a daily basis) at the
     highest rate payable under the terms of this Lease or (y) the fair market
     rental value of the Premises, in each case for the period measured from the
     day on which Tenant's hold-over commences and terminating on the day on
     which Tenant vacates the Premises. For purposes hereof, the "Holdover
     Percentage" shall be equal to 150% for the first thirty (30) days of such
     hold-over and 200% from and after the thirty-first (31st) day of such
     hold-over. In addition, if Tenant holds-over for more than thirty (30)
     days, Tenant shall save Landlord, its agents and employees harmless and
     will exonerate, defend and indemnify Landlord, its agents and employees
     from and against any and all damages which

                                      -49-

<PAGE>
     Landlord may suffer on account of Tenant's hold-over in the Premises after
     the expiration or prior termination of the term of this Lease. Nothing in
     the foregoing nor any other term or provision of this Lease shall be deemed
     to permit Tenant to retain possession of the Premises or hold over in the
     Premises after the expiration or earlier termination of the Lease Term. All
     property which remains in the Building or the Premises following vacation
     by Tenant of the Premises after the expiration or termination of this Lease
     shall be conclusively deemed to be abandoned and may either be retained by
     Landlord as its property or sold or otherwise disposed of in such manner as
     Landlord may see fit. If any part thereof shall be sold, then Landlord may
     receive the proceeds of such sale and apply the same, at its option against
     the expenses of the sale, the cost of moving and storage, any arrears of
     rent or other charges payable hereunder by Tenant to Landlord and any
     damages to which Landlord may be entitled under this Lease and at law and
     in equity.

8.19 Any insurance carried by either party with respect to the Premises or
     property therein or occurrences thereon shall, if it can be so written
     without additional premium or with an additional premium which the other
     party agrees to pay, include a clause or endorsement denying to the insurer
     rights of subrogation against the other party to the extent rights have
     been waived by the insured prior to occurrence of injury or loss. Each
     party, notwithstanding any provisions of this Lease to the contrary, hereby
     waives any rights of recovery against the other for injury or loss due to
     hazards covered by such insurance to the extent of the indemnification
     received thereunder. This waiver of rights by Tenant shall apply to, and be
     for the benefit of, Landlord's managing agent.

8.20 (A) On the conditions (which conditions Landlord may waive by written
     notice to Tenant) that at the time of exercise of the herein described
     option to extend (i) there exists no "Event of Default" (defined in Section
     7.1), (ii) this Lease is still in full force and effect, and (iii) Tenant
     has neither assigned this Lease nor sublet any portion of the Premises
     (except for an assignment subletting permitted without Landlord's consent
     under Section 5.6 hereof), Tenant shall have the right to extend the Term
     hereof upon all the same terms, conditions, covenants and agreements herein
     contained (except for the Annual Fixed Rent which shall be adjusted during
     the option period as hereinbelow set forth and except that there shall be
     no further option to extend) for one (1) period of two (2) years. The
     option period is sometimes herein referred to as the "Extended Term".
     Notwithstanding any implication to the contrary Landlord has no obligation
     to make any additional payment to Tenant in respect of any construction
     allowance or the like or to perform any work to the Premises as a result of
     the exercise by Tenant of such option.

     (B) If Tenant desires to exercise its option to extend the Term, then
     Tenant shall give notice ("Tenant's Request") to Landlord, not earlier than
     fifteen (15) months nor later than twelve (12) months prior to the
     expiration of the Original

                                      -50-
<PAGE>
     Term, of Tenant's request for Landlord's quotation of the annual fair
     market rent for the Premises as of the commencement date of the Extended
     Term, such quotation to be based on the use of the Premises as first class
     office space utilizing properties of a similar character within the Boston
     West Suburban market (including premises within the Complex if at the time
     such quotation is requested such premises shall be available for rent)
     (hereinafter called the "Annual Market Rent"). Within thirty (30) days
     after Landlord's receipt of Tenant's notice requesting such a quotation,
     Landlord shall notify Tenant of Landlord's quotation of the Annual Market
     Rent for the Extended Tenn. Within fifteen (15) days after receipt by
     Tenant of Landlord's quotation of such Annual Market Rent, Tenant shall
     have the right to extend the Term for the Extended Term by written notice
     ("Exercise Notice") to Landlord within said last mentioned 15-day period
     upon all of the same terms, conditions, covenants and agreements contained
     in this Lease except that the annual fixed rent for the Extended Term shall
     be equal to the Annual Market Rent as quoted by Landlord for the Extended
     Term; provided, however, in no event shall the Annual Fixed Rent payable
     during the Extended Term be less than the Annual Fixed Rent for the last
     year of the Original Term of this Lease and except further that the only
     extension options shall be those set forth in this Section 8.20. Upon the
     giving of such notice, this Lease and the Term hereof shall be extended,
     for the Extended Term, without the necessity for the execution of any
     additional documents (except that Landlord and Tenant agree to enter into
     an instrument in writing setting forth the Annual Fixed Rent); and in such
     event all references herein to the Term or the term of this Lease shall be
     construed as referring to the Term, as so extended, unless the context
     clearly otherwise requires. If Tenant fails timely to give either a
     Tenant's Request or an Exercise Notice pursuant to this Section 8.20, then
     Tenant shall have no further right to extend the term of the Lease pursuant
     to this Section 8.20, time being of the essence of the exercise by Tenant
     of its rights under this Section 8.20. Tenant shall have no right to extend
     the term of this Lease for more than two (2) years after the expiration of
     the Original Lease Term.

8.21 SECURITY DEPOSIT

     (A) Concurrently with the execution of this Lease, Tenant shall pay to
     landlord a security deposit in the amount of One Hundred Four Thousand
     Three Hundred Eighty-Two and 24/100 Dollars ($104,382.24) and Landlord
     shall hold the same, throughout the Term of this Lease (including the
     Extended Term, if applicable), unless sooner returned to Tenant as provided
     in this Section 8.21, as security for the performance by Tenant of all
     obligations on the part of Tenant to be performed under this Lease. At
     Tenant's option, such deposit, or any portion thereof, may be in the form
     of an irrevocable, unconditional, negotiable letter of credit (the "Letter
     of Credit"). The Letter of Credit shall (i) be issued by and drawn on a
     bank reasonably approved by Landlord and at a minimum having a corporate
     credit rating from Standard and Poor's Professional Rating Service of BBB-
     or a comparable minimum rating from Moody's Professional Rating Service
     (Landlord

                                      -51-
<PAGE>
     hereby approving Silicon Valley Bank as of the date of this Lease), (ii) be
     in a form reasonably acceptable to Landlord, (iii) permit one or more draws
     thereunder to be made accompanied only by certification by Landlord that
     pursuant to the terms of this Lease, Landlord is entitled to apply such
     Letter of Credit and the proceeds thereof to an Event of Default of Tenant
     under this Lease, (iv) permit transfers at any time without charge, and (v)
     permit presentment by recognized overnight delivery service. Any such
     Letter of Credit shall be for a term of one (1) year and shall provide for
     automatic renewals through the date which is thirty (30) days subsequent to
     the scheduled expiration of this Lease (as the same may be extended) unless
     at least 45 days prior to the expiration date or applicable anniversary
     thereof, the issuer notifies Landlord in writing ("Non Renewal Notice")
     that the issuer elects not to so renew the Letter of Credit, or if the
     issuer will not grant automatic renewals (subject to a Non Renewal Notice),
     the Letter of Credit shall be renewed by Tenant each year and each such
     renewal shall be delivered to and received by Landlord not later than
     thirty (30) days before the expiration of the then current Letter of Credit
     (herein called a "Renewal Presentation Date"). In the event of a failure to
     so deliver any such renewal Letter of Credit on or before the applicable
     Renewal Presentation Date, or if the issuer gives Landlord a Non Renewal
     Notice, Landlord shall be entitled to present the then existing Letter of
     Credit for payment and to receive the proceeds thereof, which proceeds
     shall be held as Tenant's security deposit, subject to the terms of this
     Section 8.21. Upon the occurrence of any Event of Default, Landlord shall
     have the right from time to time without prejudice to any other remedy
     Landlord may have on account thereof, to draw on all or any portion of such
     deposit held as a Letter of Credit and to apply the proceeds of such Letter
     of Credit or any cash held as such deposit, or any part thereof, to the
     extent necessary to satisfy Landlord's damages arising from such Event of
     Default on the part of Tenant under the terms of this Lease. If Landlord so
     applies all or any portion of such deposit, Tenant shall within seven (7)
     days after notice from Landlord deposit cash with Landlord in an amount
     sufficient to restore such deposit to the full amount stated in this
     Section 8.21. While Landlord holds any cash deposit Landlord shall have no
     obligation to pay interest on the same and shall have the right to
     commingle the same with Landlord's other funds. Neither the holder of a
     mortgage nor the Landlord in a ground lease on property which includes the
     Premises shall ever be responsible to Tenant for the return or application
     of any such deposit, whether or not it succeeds to the position of Landlord
     hereunder, unless such deposit shall have been received in hand by such
     holder or ground Landlord.

     Tenant not then being in default beyond the expiration of applicable grace
     periods, and having performed all of its obligations under this Lease,
     including the payment of all Annual Fixed Rent, Landlord shall return the
     deposit, or so much thereof as shall not have theretofore been applied in
     accordance with the terms of this Section 8.21, to Tenant on the expiration
     or earlier termination of the term of this Lease (as the same may have been
     extended) and surrender possession of the

                                      -52-
<PAGE>
     Premises by Tenant to Landlord in the condition required in the Lease at
     such time.

8.22 If Landlord shall not have received any payment or installment of Annual
     Fixed Rent or Additional Rent on or before the date (the "Due Date") on
     which the same first becomes payable under this Lease, the amount of such
     payment or installment shall bear interest from the Due Date through and
     including the date such payment or installment is received by Landlord, at
     a rate equal to the lesser of (i) the rate announced by Fleet National
     Bank, N.A. or its successor from time to time as its prime or base rate (or
     if such rate is no longer available, a comparable rate reasonably selected
     by Landlord), plus two percent (2%), or (ii) the maximum applicable legal
     rate, if any. Such interest shall be deemed additional rent and shall be
     paid by Tenant to Landlord upon demand.

8.23 This Lease shall be governed exclusively by the provisions hereof and by
     the law of the Commonwealth of Massachusetts, as the same may from time to
     time exist.

8.24 Each and every payment and expenditure, other than Annual Fixed Rent, shall
     be deemed to be Additional Rent hereunder, whether or not the provisions
     requiring payment of such amounts specifically so state, and shall be
     payable, unless otherwise provided in this Lease, within thirty (30) days
     after written demand by Landlord, and in the case of the non-payment of any
     such amount, Landlord shall have, in addition to all of its other rights
     and remedies, all the rights and remedies available to Landlord hereunder
     or by law in the case of non-payment of Annual Fixed Rent. Unless expressly
     otherwise provided in this Lease, the performance and observance by Tenant
     of all the terms, covenants and conditions of this Lease to be performed
     and observed by Tenant shall be at Tenant's sole cost and expense. If
     Tenant has not objected to any statement of Additional Rent which is
     rendered by Landlord to Tenant within ninety (90) days after Landlord has
     rendered the same to Tenant, them the same shall be deemed to be a final
     account between Landlord and Tenant not subject to any further dispute. In
     the event that Tenant shall seek Landlord's consent or approval under this
     Lease, then Tenant shall reimburse Landlord, upon demand, as Additional
     Rent, for all reasonable costs and expenses, including legal and
     architectural costs and expenses, incurred by Landlord in processing such
     request, whether or not such consent or approval shall be given.

8.25 To induce Landlord to enter into this Lease, the Tenant hereby waives any
     right to trial by jury in any action, proceeding or counterclaim brought by
     either Landlord or Tenant on any matters whatsoever arising out of any way
     connected with this Lease, the relationship of the Landlord and the Tenant,
     the Tenant's use or occupancy of the premises and/or any claim of injury or
     damage, including but not limited to, any summary process eviction action.

                                      -53-
<PAGE>

     EXECUTED as a sealed instrument in two or more counterparts each of which
shall be deemed to be an original.

WITNESS:                                LANDLORD:

                                        BOSTON PROPERTIES LIMITED PARTNERSHIP

                                        By BOSTON PROPERTIES, INC.,
                                        Its general partner

/s/ [illegible]                         By /s/ David C. Provost
-------------------------------------      -------------------------------------
                                        Name David C. Provost
                                        Title Vice President

                                        TENANT:

                                        ROVING SOFTWARE INCORPORATED

                                        By /s/ Gail F. Goodman
                                           -------------------------------------
                                        Name Gail F. Goodman
                                        Title PRESIDENT
                                              (OR VICE PRESIDENT)
                                              HERETO DULY AUTHORIZED

ATTEST:

/s/ Gail F. Goodman                     By /s/ Gail F. Goodman
-------------------------------------      -------------------------------------
Name Gail F. Goodman                    Name Gail F. Goodman
Title SECRETARY                         Title TREASURER
      (ASSISTANT SECRETARY)                   (OR ASSISTANT TREASURER)
                                              HERETO DULY AUTHORIZED

(CORPORATE SEAL)

<PAGE>

                                    EXHIBIT A

                                   DESCRIPTION

     A parcel of land (the "Land") in Waltham and Lexington, Middlesex County,
Massachusetts containing 34.372 acres and shown on that certain plan entitled
"Plan of Land in Waltham and Lexington, Middlesex Co., Mass.", dated March
6,1986, prepared by Land Surveys Incorporated, recorded with the Middlesex South
District Registry of Deeds (the "Registry") in Book 17090, Page End (the
"Plan"), bounded and described as follows:

<TABLE>
<S>                 <C>
EASTERLY            by the Northern Circumferential Highway (Route 128) by two
                    lines measuring 1,067.16 feet and 127.72 feet;

SOUTHEASTERLY       by the ramp to Trapelo Road and Trapelo Road by five lines
AND SOUTHERLY       measuring 309.05 feet, 262.57 feet, 122.01 feet, 78.18 feet,
                    and 8.38 feet;

NORTHWESTERLY       by land N/F Reservoir Place Realty Trust, 110 feet;

SOUTHERLY           by land N/F Reservoir Place Realty Trust, 96.07 feet, and by
                    land N/F William and Louise Butler, 99 feet;

NORTHWESTERLY       by land N/F Thomas P. and Sandra H. Kehoe, 105 feet;

SOUTHERLY           62 feet,

SOUTHEASTERLY       39.27 feet and 160 feet, and

NORTH-EASTERLY      39.27 feet, all by land of N/F Thomas P, and Sandra H.
                    Kehoe;

SOUTHWESTERLY       by Trapelo Road, 95 feet;

NORTHWESTERLY       39.27 feet and 100 feet, and

SOUTHWESTERLY       102.57 feet, all by land N/F Leonard and Evalyn Weld;

NORTHWESTERLY       275 feet, and

SOUTHWESTERLY       122.35, by land N/F Robert L. and Barbara T. Anderson;
</TABLE>

                                      -55-
<PAGE>

<TABLE>
<S>                 <C>
NORTHWESTERLY       by two lines measuring 235.15 feet and 284.27 feet, by lands
                    N/F Edward J. and Beverly J. Mirabito, Carol Lane, N/F
                    Charles J. Senior, Jr., N/F Donald and Shirley Gibbs, N/F
                    Raymond R. and Bridget Picard, and N/F Henry F. Miller;

WESTERLY            by five lines measuring 580.06 feet, 25 feet, 128.21 feet,
                    344.66 feet and 9.12 feet, by lands N/F Henry P, Miller, N/F
                    John H. and Nancy Russell, N/F Frederick and Anne Creamer,
                    N/F J.S.C. Realty Trust, N/F Santo and Catherine Lafauci,
                    N/F Jean Yves and Annette Morin,

                    N/F Helen K. Hickey, Priscilla Lane, N/F Stanley C. and
                    Louise H. Whynock, and the City of Waltham;

NORTHEASTERLY       692.16 feet by land N/F The C-R Trust;

EASTERLY            137.39 feet by Route 128;

SOUTHWESTERLY       by two lines measuring 336.67 feet and 286.94 feet by land
                    N/F Tracer Lane Trust;

EASTERLY            by two lines measuring 506.14 feet and 325.94 feet, by land
                    N/F Tracer Lane Trust;

NORTHERLY           45 feet,

WESTERLY            27 feet, and

NORTHERLY           555.01 feet, all by land N/F Tracer Lane Trust.
</TABLE>

     Together with the right, in common with others, use Tracer Lane, a private
way, throughout its entire length over the Land, for access to and from Trapelo
Road, a public way, and for all other purposes for which public ways are
normally used in the City of Waltham and the Town of Lexington, as shown on the
Plan.

     Together with the appurtenant right in common with others to use that
portion of the Land located within the easement granted to Boston Edison Company
by a Grant of Easement dated October 2, 1946 and recorded in the Registry in
Book 7098, Page 118, for all purposes allowed under an Agreement with Boston
Edison Company and Albamont Properties, Inc. dated January 31, 1975 and recorded
in the Registry in Book 12771, Page 538.

     Together with the appurtenant right and easement, in common with others, to
discharge surface water contained in an Easement Indenture among Tracerlab, Inc.
et al. dated January 9, 1957 and recorded in the Registry in Book 8892, Page
112.

                                      -56-

<PAGE>
     Together with the appurtenant rights and easements, in common with others,
granted to, the owner of the Land in (a) an Indenture among Boston Edison
Company et al. Dated September 19, 1966 and recorded in the Registry in Book
11258, Page 79, (b) a Utilities Maintenance Agreement among LFE Inc. et al dated
September 19, 1966 and recorded in the Registry in Book 11258, Page 92, and (c)
an Easement Indenture among 128 Realty Corporation et al. dated September 19,
1966 and recorded in the Registry in Book 11258, Page 061.

     Together with the right and easement, in common with others, granted the
owner of the Land in an Agreement dated May 12,1975 and recorded in the Registry
in Book 12892, Page 410.

     Together with the right to terminate the Agreement between Leonard N. Weld
et ux. dated April 9,1974 and recorded in the Registry in Book 12627, Page 235.

                                      -57-
<PAGE>

                                    EXHIBIT B

                         DESCRIPTION OF LANDLORD'S WORK

Phase I Construction

1.   Server room 4-ton dedicated HVAC unit installed, functional, and tested
     with a separate thermostat control in the server room.

2.   Server room expansion by relocating left server room wall roughly 6 1/2
     feet into the kitchen space.

3.   Power requirements

     a.   Dedicate the already existing 60-amp panel in the server room to
          exclusively power all of the cubicles that Tenant is building out
          (complete)

     b.   Installing another 60-amp panel (three phase) in the server room to
          service all of the server racks and computers within the server room.

     c.   Connecting the A/C unit to the already existing Nema-5-30 wall outlet,
          which draws power from a third power panel NOT located in the Premises
          (complete)

     d.   Attaching the 4 quad outlets in the server room to another power panel
          which is NOT in the Premises (complete)

Phase II Construction

1.   Removal of small decorative wall at main entrance.

                                      -58-
<PAGE>

                                    EXHIBIT C

                                LANDLORD SERVICES

                                 RESERVOIR PLACE

I.   CLEANING:

     Cleaning and janitor services as provided below:

     A.   OFFICE AREAS:

          DAILY: (Monday through Friday, inclusive, holidays excepted).

          1.   Empty all waste receptacles and ashtrays and remove waste
               material from the Premises; wash receptacles as necessary.

          2.   Sweep and dust mop all uncarpeted areas using a dust-treated mop.

          3.   Vacuum all rugs and carpeted areas.

          4.   Hand dust and wipe clean with treated cloths all horizontal
               surfaces, including furniture, office equipment, window sills,
               door ledges, chair rails, and convector tops, within normal
               reach.

          5.   Wash clean all water fountains and sanitize.

          6.   Move and dust under all desk equipment and telephones and replace
               same (but not computer terminals, specialized equipment or other
               materials).

          7.   Wipe clean all chrome and other bright work.

          8.   Hand dust grill work within normal reach.

          9.   Main doors to premises shall be locked and lights shut off upon
               completion of cleaning.

          WEEKLY:

          1.   Dust coat racks and the like.

          2.   Spot clean entrance doors, light switches and doorways.

                                      -59-

<PAGE>
QUARTERLY:

          1.   Render high dusting not reached in daily cleaning to include:

               a)   dusting all pictures, frames, charts, graphs and similar
                    wall hangings.

               b)   dusting of all vertical surfaces, such as walls, partitions,
                    doors and door frames, etc.

               c)   dusting all pipes, ducts and moldings.

               d)   dusting of all vertical blinds.

               e)   dust all ventilating, air conditioning, louvers and grills.

          2.   Spray buff all resilient floors.

     B.   LAVATORIES:

          DAILY: (Monday through Friday, inclusive, holidays excepted).

          1.   Sweep and damp mop.

          2.   Clean all mirrors, powder shelves, dispensers and receptacles,
               bright work, flushometers, piping and toilet seat hinges.

          3.   Wash both sides of all toilet seats.

          4.   Wash all basins, bowls and urinals.

          5.   Dust and clean all powder room fixtures.

          6.   Empty and clean paper towel and sanitary disposal receptacles.

          7.   Remove waste paper and refuse.

          8.   Refill tissue holders, soap dispensers, towel dispensers,
               sanitary dispensers; materials to be furnished by Landlord,

          MONTHLY:

          1.   Machine scrub lavatory floors.

                                      -60-

<PAGE>
          2.   Wash all partitions and tile walls in lavatories.

          3.   Dust all lighting fixtures and grills in lavatories.

     C.   MAIN LOBBIES, ELEVATORS, STAIRWELLS AND COMMON CORRIDORS:

          DAILY: (Monday through Friday, inclusive, holidays excepted).

          1.   Sweep and damp mop all floors, empty and clean waste receptacles,
               dispose of waste.

          2.   Clean elevators, wash or vacuum floors, wipe down walls and
               doors.

          3.   Spot clean any metal work inside lobbies.

          4.   Spot clean any metal work surrounding building entrance doors.

          5.   Sweep all stairwells and dust handrails.

          MONTHLY:

          1.   All resilient tile floors in public areas to be spray buffed.

     D.   WINDOW CLEANING:

          All exterior windows shall be washed on the inside and outside
          surfaces no less than three (3) times per year.

II.  HVAC:

     A.   Heating, ventilating and conditioning equipment will be provided with
          sufficient capacity to accommodate a maximum population density of one
          (1) person per one hundred fifty (150) square feet of useable floor
          area served. In the event Tenant introduces into the Premises
          personnel or equipment which overloads the system's ability to
          adequately perform its proper functions, Landlord shall notify Tenant
          in writing and supplementary system(s) may be required and installed
          by Landlord at Tenant's expense, if within fifteen (15) days Tenant
          has not modified its use so as not to cause such overload.

                                      -61-

<PAGE>
          Operating criteria of the basic system are in accordance with the
          Massachusetts Energy Code and shall not be less than the following:

          1.   Cooling season indoor conditions of not in excess of 78 degrees
               Fahrenheit when outdoor conditions are 91 degrees Fahrenheit
               drybulb and 73 degrees Fahrenheit wetbulb.

          2.   Heating season minimum room temperature of 70 degrees Fahrenheit
               when outdoor conditions are 6 degrees Fahrenheit drybulb.

     B.   Landlord shall provide heating, ventilating and air conditioning as
          normal seasonal charges may require during Normal Building Operating
          Hours (8:00 a.m. to 6:00 p.m., Monday through Friday, and 8:00 a.m. to
          1:00 p.m. on Saturdays, legal holidays in all cases excepted).

          If Tenant shall require air conditioning (during the air conditioning
          season) or heating or ventilating during any season outside Normal
          Building Operating Hours, Landlord shall use landlord's best efforts
          to furnish such services for the area or areas specified by written
          request of Tenant delivered to the Building Superintendent or the
          Landlord before 3:00 p.m. of the business day preceding the extra
          usage. For such services, Tenant shall pay Landlord, as additional
          rent, upon receipt of billing, a sum equal to the cost incurred by
          Landlord. As of the date of this Lease, the cost for such service is
          $32.00 per hour.

III. ELECTRICAL SERVICES:

     A.   Landlord shall provide electric power for a combined load of 3.0 watts
          per square foot of useable area for lighting and for office machines
          through standard receptacles for a typical office space and Landlord
          shall provide the additional power requirements per Exhibit B.

     B.   Landlord shall require separate check or sub-metering and direct
          billing to Tenant for the electric power required for the HVAC unit to
          be installed in the Premises as part of the Landlord Work and for any
          other special equipment (such as computers and reproduction equipment)
          that requires either 3-phase electric power or any voltage other than
          120, or for any other usage in excess of 3.0 watts per square foot.

     C.   Landlord will furnish and install, at Tenant's expense, all
          replacement lighting tubes, lamps and ballasts required by Tenant.
          Landlord will clean lighting fixtures on a regularly scheduled basis
          at Tenant's expense.

                                      -62-

<PAGE>
IV.  ELEVATORS:

     Provide passenger elevator service.

V.   WATER:

     Provide hot water for lavatory purposes and cold water for drinking,
     lavatory and toilet purposes.

VI.  CARD ACCESS SYSTEM:

     Landlord will provide a card access system at one entry door of the
     building.

                                      -63-

<PAGE>

                                    EXHIBIT D

                                   FLOOR PLAN

                              [IMAGE OF FLOOR PLAN]

                                      -64-
<PAGE>

                                    EXHIBIT E

                       FORM OF COMMENCEMENT DATE AGREEMENT

     Reference is made to that certain Lease by and between ___________________
__________________, a(n) __________________, Landlord and _____________________,
a(n) ________________________, Tenant, and dated ___________________.

     Landlord and Tenant hereby confirm and agree that the Commencement Date
under the Lease is _______________________ and that the Lease Term is _________.

     This Commencement Date Agreement is executed as a sealed instrument as of
_________, 20___.

                                        LANDLORD:                              ,
                                                  -----------------------------
                                        a(n)
                                             -----------------------------------

                                        By:
                                            ------------------------------------

                                            ------------------------------------

                                        By:
                                            ------------------------------------

                                            ------------------------------------

                                        By:
                                            ------------------------------------
                                        Name:
                                              ----------------------------------
                                        Title:
                                               ---------------------------------

                                        TENANT:                                ,
                                                -------------------------------
                                        A(n)
                                             -----------------------------------

                                        By:
                                            ------------------------------------
                                        Name:
                                              ----------------------------------
                                        Title:
                                               ---------------------------------
                                        Name (print):
                                                      --------------------------

                                      -65-

<PAGE>

                                    EXHIBIT F

                               LIST OF MORTGAGEES

     Security Agreement and Mortgage Deed, dated 10/30/96 recorded in the South
Middlesex Registry of Deeds at Book 26791, Page 101, affected by Amended and
Restated Mortgage Deed from Landlord to Teachers Insurance and Annuity
Association of America, dated 11/3/98 recorded with said Deeds, said mortgagee
having an address Attn: Joan Herman, Sr. Investment Analyst, 730 Third Avenue,
New York, NY 10017.

                                      -66-

<PAGE>

                            FIRST AMENDMENT TO LEASE

     FIRST AMENDMENT TO LEASE dated as of this 29th day of June, 2005, by and
between BOSTON PROPERTIES LIMITED PARTNERSHIP, as landlord ("Landlord") and
ROVING SOFTWARE INCORPORATED, a Delaware corporation, d/b/a CONSTANT CONTACT, as
tenant ("Tenant").

                                    RECITALS

     By Lease (the "Lease") dated July 9, 2002, Landlord did lease to Tenant and
Tenant did lease from Landlord a portion of the second (2nd) floor of the
building known as and numbered Reservoir Place, 1601 Trapelo Road, Waltham,
Massachusetts (the "Building") consisting of 8,521 square feet of rentable floor
area (the "Rentable Floor Area of the Initial Premises") which Premises are more
particularly described in the Lease (the "Initial Premises").

     Landlord and Tenant have agreed to terminate the Lease with regard to the
entire Initial Premises (hereinafter sometimes also referred to as the
"Relinquished Premises") and Tenant has determined to Lease from Landlord the
27,094 square feet of rentable floor area (the "Rentable Floor Area of the New
Premises") on the third floor of the Building, which space is shown on Exhibit A
attached hereto as New Premises (hereinafter sometimes referred to as the "New
Premises ") upon all of the same terms and conditions contained in the Lease,
except as otherwise provided in this First Amendment to Lease (the "First
Amendment").

     In addition, the Lease provides for a Term which will expire, unless
extended or sooner terminated, on July 31, 2005. Landlord and Tenant desire to
extend the Term of the Lease upon the terms contained in this First Amendment.

     Landlord and Tenant are entering into this instrument to set forth said
leasing of the New Premises, to integrate the New Premises into the Lease, to
extend the Term of the Lease and to amend the Lease.

     NOW THEREFORE, in consideration of One Dollar ($1.00) and other good and
valuable consideration in hand this date paid by each of the parties to other,
the receipt and sufficiency of which are hereby severally acknowledged, and in
further consideration of the mutual promises herein contained, Landlord and
Tenant hereby agree to and with each other as follows:

     1. As of the "New Premises Commencement Date (as defined in Section 2
hereinbelow) the New Premises shall constitute a part of the "Premises" (and
"Tenant's Space") demised to Tenant under the Lease and as of the "Relinquish
Date" (as defined in Section 3 hereof) the Relinquished Premises shall no longer
be deemed to be a part of and shall be deleted and removed from the "Premises"
(and "Tenant's Space") demised to Tenant under the Lease. By way of example, the
option to extend the Lease Term provided in Section 6 hereinbelow shall apply to
the New Premises but not to the Relinquished Premises.

     2. The following definitions are hereby added to Section 1.1 of the Lease
immediately after the definition of "Outside Completion Date for Phase II
Construction":

<PAGE>

          NEW PREMISES           The earlier to occur of (i) the date on which
          COMMENCEMENT DATE:     the New Premises are substantially complete as
                                 provided in Exhibit C attached to this First
                                 Amendment, or (ii) the date which Tenant
                                 commences beneficial use of the New Premises.

          NEW PREMISES           October 1, 2005
          SCHEDULED TERM
          COMMENCEMENT DATE:

          NEW PREMISES OUTSIDE   March 1, 2006
          COMPLETION DATE:

          NEW PREMISES LEASE     That period of time commencing on the New
          TERM:                  Premises Commencement Date and expiring on the
                                 expiration on the First Extended Term (defined
                                 in Section 4 hereinbelow).

     3. On or prior to the New Premises Commencement Date (sometimes hereinafter
also referred to as the "Relinquish Date"), Tenant shall quit and vacate the
Relinquished Premises and surrender the same in the condition required by the
Lease upon the expiration or earlier termination of the Lease Term.

     4. The Lease Term, which but for this First Amendment is scheduled to
expire on July 31, 2005, is hereby extended for a period commencing on August 1,
2005 and expiring on the date which is sixty (60) months subsequent to the New
Premises Commencement Date (plus the partial month, if any, immediately
following the New Premises Commencement Date) (the "First Extended Term") unless
sooner extended or terminated in accordance with the provisions of the Lease as
herein amended, such extension to be upon all the same terms and conditions set
forth in the Lease except as otherwise provided in this First Amendment.

     5. Section 8.20 of the Lease is hereby deleted in its entirety and Landlord
and Tenant hereby acknowledge and agree that Tenant's only option to extend the
Lease Term beyond the expiration of the First Extended Term shall be as set
forth in Section 6 hereinbelow.

     6. (A) On the conditions (which conditions Landlord may waive by written
notice to Tenant) that both at the time of exercise of the herein described
option to extend and as of the commencement of such extended term (i) there
exists no "Event of Default" (defined in Section 7.1 of the Lease) and there
have been no more than two (2) Event of Default occurrences during the Term,
(ii) the Lease is still in full force and effect, and (iii) Tenant has neither
assigned the Lease nor sublet the Premises (except for an assignment or
subletting permitted without Landlord's consent under Section 5.6 hereof),
Tenant shall have the right to extend the Term of the Lease upon all the same
terms, conditions, covenants and agreements contained in the Lease (except for
the Annual Fixed Rent which shall be adjusted during the option period as
hereinbelow set forth and except that there shall be no further option to
extend) for one period of

<PAGE>

three (3) years. The option period is sometimes herein referred to as the
"Second Extended Term." Notwithstanding any implication to the contrary Landlord
has no obligation to make any additional payment to Tenant in respect of any
construction allowance or the like or to perform any work to the Premises as a
result of the exercise by Tenant of any such option.

          (B) If Tenant desires to exercise its option to extend the Term of the
Lease, then Tenant shall give notice ("Tenant's Request") to Landlord, not
earlier than fifteen (15) months nor later than twelve (12) months prior to the
expiration of the First Extended Tenn, of Tenant's request for Landlord's
quotation of the annual fair market rent for the Premises as of the commencement
date of the Second Extended Term, such quotation to be based on the use of the
Premises as first class office space utilizing properties of a similar character
within the Boston West Suburban market (including premises within the Complex if
at the time such quotation is requested such premises shall be available for
rent) (hereinafter called the "Annual Market Rent"). Within thirty (30) days
after Landlord's receipt of Tenant's notice requesting such a quotation,
Landlord shall notify Tenant of Landlord's quotation of the Annual Market Rent
for the Second Extended Term. Within fifteen (15) days after receipt by Tenant
of Landlord's quotation of such Annual Market Rent, Tenant shall have the right
to extend the Term of the Lease for the Second Extended Term by written notice
("Exercise Notice") to Landlord within said last mentioned 15-day period upon
all of the same terms, conditions, covenants and agreements contained in the
Lease, as amended, except that the annual fixed rent for the Second Extended
Term shall be equal to the Annual Market Rent as quoted by Landlord for the
Second Extended Term; provided, however, in no event shall the Annual Fixed Rent
payable during the Second Extended Term be less than the Annual Fixed Rent for
the last year of the Term of the Lease as it may have been extended and except
further that there shall be no further extension option. Upon the giving of such
notice, the Lease and the Term shall be extended, for the Second Extended Term,
without the necessity for the execution of any additional documents (except that
Landlord and Tenant agree to enter into an instrument in writing setting forth
the Annual Fixed Rent); and in such event all references herein to the Term or
the term of the Lease shall be construed as referring to the Term, as so
extended, unless the context clearly otherwise requires. If Tenant fails timely
to give either a Tenant's Request or an Exercise Notice pursuant to this Section
6, then Tenant shall have no further right to extend the term of the Lease
pursuant to this Section 6, time being of the essence of the exercise by Tenant
of its rights under this Section 6. Tenant shall have no right to extend the
term of this Lease for more than three (3) years after the expiration of the
First Extended Term.

          7. (A) Annual Fixed Rent for the Initial Premises shall continue to be
payable through the Relinquish Date as provided in the Lease.

               (B) (i) During the period from the New Premises Commencement Date
through the date which is twenty-four (24) months subsequent to the New Premises
Commencement Date (plus the partial month, if any, immediately following the New
Premises Commencement Date), Annual Fixed Rent for the New Premises shall be
payable at the annual rate of $636,709.00 (being the product of (i) $23.50 and
(ii) the Rentable Floor Area of the New Premises).

                    (ii) During the period from the twenty-fifth (25th) month
following the New Premises Commencement Date (plus the partial month, if any,
immediately

<PAGE>

following the New Premises Commencement Date) through the expiration of the
First Extended Term, Annual Fixed Rent for the New Premises shall be payable at
the annual rate of $650,256.00 (being the product of (i) $24.00 and (ii) the
Rentable Floor Area of the New Premises).

                    (C) Annual Fixed Rent for the New Premises during the Second
Extended Term (if exercised) shall be payable as provided in Section 6 of this
First Amendment.

     8. (A) For purposes of calculating Tenant's payments for Operating Expenses
pursuant to Section 2.6 of the Lease for that portion of the Lease Term prior to
the New Premises Commencement Date, the definition of "Base Operating Expenses"
contained in Section 1.1 of the Lease shall be unchanged. For that portion of
the Lease Term on and after the New Premises Commencement Date, for such
purposes, the definition of "Base Operating Expenses" shall be deleted in its
entirety and substituted with the following:

          BASE OPERATING Landlord's Operating Expenses (as hereinafter defined
          EXPENSES:      in Section 2.6) for calendar year 2005 being January 1,
                         2005 through December 31, 2005.

          (B) For purposes of calculating Tenant's payments for real estate
taxes pursuant to Section 2.7 of the Lease for that portion of the Lease Term
prior to the New Premises Commencement Date, the definition of "Base Taxes"
contain in Section 1.1 of the Lease shall be unchanged. For that portion of the
Lease Term on and after the New Premises Commencement Date, for such purposes,
the definition of "Base Taxes" shall be deleted in its entirety and Substituted
with the following:

          BASE TAXES:   Landlord's Tax Expenses (as defined in Section 2.7)
                        for fiscal tax year 2006 (being July 1, 2005 through
                        June 30, 2006).

     9. For the purposes of computing Tenant's payments for operating expenses
pursuant to Section 2.6 of the Lease, Tenant's payments for real estate taxes
pursuant to Section 2.7 of the Lease and Tenant's payments for electricity (as
determined pursuant to Sections 2.5 and 2.8 of the Lease) for the period on and
after the New Premises Commencement Date , the "Rentable Floor Area of Tenant's
Space" shall be 27,094 square feet (being the Rentable Floor Area of New
Premises). For the period prior to such date, the definition of "Rentable Floor
Area of Tenant's Space" shall continue to be the Rentable Floor Area of the
Initial Premises for such purposes.

     10. , As of the date of this First Amendment, Tenant agrees to pay to
Landlord $111,917.76 (the "Additional Security Deposit"). Such Additional
Security Deposit along with the original security deposit in the amount of
$104,382.24 paid by Tenant in accordance with Section 8.21 of the Lease contain
a total of $216,300.00 and shall be held by Landlord as security for the
performance by Tenant of all obligations on the part of the Tenant under the
Lease during the Term (as extended hereunder and as may be further extended)
with respect to

<PAGE>

the Initial Premises, the New Premises and the Sublease Premises pursuant to the
terms and conditions set forth in such Section 8.21.

     11. Landlord agrees to perform the work respecting the New Premises as
described in Exhibit B attached hereto. All such work will be performed in
accordance with the Work Letter attached hereto as Exhibit C.

     12. As of the New Premises Commencement Date, the "Number of Parking
Privileges" for which Tenant is entitled pursuant to Section 1.1 shall be
increased to ninety-five (95) automobiles, thirty-one (31) of which are located
in the garage below the Building and sixty-four (64) of which are located on the
outdoor surface lot.

     13. In no event shall Tenant have the right to terminate or cancel the
Lease or to withhold rent or to set-off any claim or damages against rent as a
result of any default by Landlord or breach by Landlord of its covenants or
warranties or promises under the Lease, except in the case of a wrongful
eviction of Tenant from the demised premises (constructive or actual) by
Landlord continuing after notice to Landlord thereof and a reasonable
opportunity for Landlord to cure the same. Further, the Tenant shall not assert
any right to deduct the cost of repairs or any monetary claim against the
Land1ord from rent thereafter due and payable, but shall look solely to the
Landlord for satisfaction of such claim.

     14. As an inducement to Landlord to enter into this First Amendment, Tenant
hereby represents and warrants that: (i) Tenant is not, nor is it owned or
controlled directly or indirectly by, any person, group, entity or nation named
on any list issued by the Office of Foreign Assets Control of the Unites States
Department of the Treasury ("OFAC") pursuant to Executive Order 13224 or any
similar list or any law, order, rule or regulation or any Executive Order of the
President of the United States as a terrorist, "Specially Designated National
and Blocked Person" or other banned or blocked person (any such person, group,
entity or nation being hereinafter referred to as a "Prohibited Person"); (ii)
Tenant is not (nor is it owned, controlled, directly or indirectly, by any
person, group, entity or nation which is) acting directly or indirectly for or
on behalf of any Prohibited Person; and (iii) neither Tenant (nor any person,
group, entity or nation which owns or controls Tenant, directly or indirectly)
has conducted or will conduct business or has engaged or will engage in any
transaction or dealing with any Prohibited Person, including without limitation
any assignment of the Lease or any subletting of all or any portion of the
Premises or the making or receiving of any contribution or funds, goods or
services to or for the benefit of a Prohibited Person. In connection with the
foregoing, it is expressly understood and agreed that (x) any breach by Tenant
of the foregoing representations and warranties shall be deemed an immediate
Event of Default by Tenant under Section 7.1 of the Lease (without the benefit
of notice or grace) and shall be covered by the indemnity provisions of Section
5.7 of the Lease, and (y) the representations and warranties contained in this
subsection shall be continuing in nature and shall survive the expiration or
earlier termination of the Lease.

     15. Landlord and Tenant acknowledge that as of the date of this First
Amendment Tenant subleases from Authoria, Inc. pursuant to a Sublease dated
October __ 2004 (the "Sublease") 2,200 square feet of rentable floor area
located on the second floor of the Building (the "Sublease Premises") and that
the term of the Sublease along with the underlying master

<PAGE>

lease are scheduled to expire on July 31, 2005 (the "Sublease Expiration Date").
In the event that the New Premises Commencement Date has not occurred prior to
the Sublease Expiration Date, the Sublease Premises shall be added to the
"Premises" leased under the Lease for a term commencing on August 1, 2005 and
expiring on the New Premises Commencement Date. The leasing of the Sublease
Premises shall be upon all of the terms and conditions set forth in the Lease,
as amended, except that Tenant shall not be obligated to make payments for
operating expenses as provided in Section 2.6, real estate taxes as provided in
Section 2.7 or electricity as provided in Sections 2.5 and 2.8 for the Sublease
Premises and except further that Annual Fixed Rent shall be payable for the
Sublease Premises at the annual rate of $44,000.00 (being the product of (i)
$20.00 and (ii) the Rentable Floor Area of the Sublease Premises (being 2,200
square feet) in the same manner provided in the Lease for payments of Annual
Fixed Rent. Notwithstanding anything to the contrary herein, Landlord shall have
no obligation to perform any additions, alterations or improvements in the
Sublease Premises. Upon the expiration or earlier termination of the Lease with
respect to the Sublease Premises, Tenant shall return the Sublease Premises to
Landlord in the condition required pursuant to the Lease. The extension option
contained in this First Amendment shall not be applicable to the Sublease
Premises.

     16. (A) Tenant warrants and resents that Tenant has not dealt with any
broker in connection with the consummation of this First Amendment other than
Cushman & Wakefield (the "Broker"); and in the event any claim is made against
Landlord relative to dealings by Tenant with brokers other than the Broker,
Tenant shall defend the claim against Landlord with counsel of Tenant's
selection first approved by Landlord (which approval will not be unreasonably
withheld) and save harmless and indemnify Landlord on account of loss, cost or
damage which may arise by reason of such claim.

          (B) Landlord warrants and represents that Landlord has not dealt with
any broker in connection with the consummation of this First Amendment other
than the Broker; and in the event any claim is made against Tenant relative to
dealings by Landlord with brokers, Landlord shall defend the claim against
Tenant with counsel of Landlord's selection and save harmless and indemnify
Tenant on account of loss, cost or damage which may arise by reason of such
claim.

     17. Except as otherwise expressly provided herein, all capitalized terms
used herein without definition shall have the same meanings as are set forth in
the Lease.

     18. Except as herein amended the Lease shall remain unchanged and in full
force and effect. All references to the "Lease" shall be deemed to be references
to the Lease as herein amended.

<PAGE>
     EXECUTED as of the date and year first above written.

WITNESS:                                LANDLORD:
                                        BOSTON PROPERTIES LIMITED PARTNERSHIP
                                        By BOSTON PROPERTIES, INC.,
                                        its general partner

/s/ [illegible]                         By: /s/ David C. Provost
-------------------------------------      -------------------------------------
                                        Name: David C. Provost
                                        Title: Senior Vice President
                                               Boston Properties

                                        TENANT:
ATTEST:                                 ROVING SOFTWARE INCORPORATED

By: /s/ Eric S. Groves                  By: /s/ Gail F. Goodman
   ----------------------------------      -------------------------------------
  Name: Eric S. Groves                  Name: Gail F. Goodman
  Title: Secretary or Assistant         Title: President (or Vice President)
         Secretary

<PAGE>

                                    EXHIBIT B

                         DESCRIPTION OF LANDLORD'S WORK

                             [IMAGE OF FLOOR PLAN]

<PAGE>

EXHIBIT C

                                   WORK LETTER

1.1  SUBSTANTIAL COMPLETION.

     (A)  Plans and Construction Process.

          (1)  Landlord's Work. Landlord shall perform the work in the New
               Premises shown on the plans (the "Plans") listed on Exhibit B
               annexed to this Amendment ("Landlord's Work"); provided, however,
               that Landlord shall have no responsibility for the installation
               or connection of Tenant's computer, telephone, other
               communication equipment, systems or wiring. Any items of work
               requested by Tenant and not shown on the Plans shall be deemed to
               be Change Proposal(s) (as defined below) and shall be subject to
               the terms and provisions of subsection (2) below.

          (2)  Change Orders. Tenant shall have the right, in accordance
               herewith, to submit for Landlord's approval change proposals with
               respect to items of work not shown on the Plans (each, a "Change
               Proposal"). Landlord agrees to respond to any such Change
               Proposal within such time as is reasonably necessary (taking into
               consideration the information contained in such Change Proposal)
               after the submission thereof by Tenant, advising Tenant of any
               anticipated costs ("Change Order Costs") associated with such
               Change Proposal (which shall include a construction management
               fee equal to 6% of the Change Proposal), as well as an estimate
               of any delay which would likely result in the completion of the
               Landlord's Work if a Change Proposal is made pursuant thereto.
               Tenant shall have the right to then approve or withdraw such
               Change Proposal within five (5) days after receipt of such
               information. If Tenant fails to respond to such Change Proposal
               within such five (5) day period, such Change Proposal shall be
               deemed withdrawn. If Tenant approves such Change Proposal, then
               such Change Proposal shall be deemed a "Change Order" hereunder
               and if the Change Order is made, then the Change Order Costs
               associated with the Change Order shall be deemed additions to
               Landlord's Work and shall be paid in the same manner as Tenant
               Plan Excess Costs are paid as set forth in Section 1.3.

          (3)  Except to the extent that another time period is expressly herein
               set forth, Tenant shall respond to any request from Landlord,
               Landlord's architect, Landlord's contractor and/or Landlord's
               construction representative for approvals or information in
               connection with Landlord's Work, within two (2) business days of
               Tenant's receipt of such request. In addition, Tenant shall,
               within two (2) business days after receipt thereof from Landlord,
               execute and deliver to Landlord any affidavits and documentation
               required in order to obtain all permits and approvals necessary
               for Landlord to

<PAGE>

               commence and complete Landlord's Work on a timely basis ("Permit
               Documentation").

          (4)  Time of the Essence. Time is of the essence in connection with
               Tenant's obligations under this Section 1.1.

     (B)  Substantial Completion; Tenant Delay.

          (1)  Landlord's Obligations. Subject to delays due to Tenant Delays
               (as hereinafter defined) and delays due to any prevention, delay
               or stoppage due to governmental regulation, strikes, lockouts,
               acts of God, acts of war, terrorist acts, civil commotions,
               unusual scarcity of or inability to obtain labor or materials,
               labor difficulties, casualty or other causes reasonably beyond
               Landlord's control or attributable to Tenant's action or inaction
               ("Force Majeure"), Landlord shall use reasonable speed and
               diligence to have the Landlord's Work with respect to the New
               Premises substantially completed on or before the New Premises
               Scheduled Term Commencement Date, but Tenant shall have no claim
               against Landlord for failure so to complete construction of
               Landlord's Work in the New Premises, except for the right to
               terminate this Lease with respect to the New Premises only,
               without further liability to either party, in accordance with the
               provisions hereinafter specified in Section 1.2

          (2)  Definition of Substantial Completion. The New Premises shall be
               treated as having been substantially completed and be deemed
               ready for Tenant's occupancy on the later of:

               (a)  The date on which Landlord's Work, together with common
                    facilities for access and services to the New Premises has
                    been completed (or would have been completed except for
                    Tenant Delay) except for items of work and adjustment of
                    equipment and fixtures which can be completed after
                    occupancy has been taken without causing substantial
                    interference with Tenant's use of such premises (i.e.
                    so-called "punch list" items), or

               (b)  The date when permission has been obtained from the
                    applicable governmental authority, to the extent required
                    by law, for occupancy by Tenant of the New Premises for the
                    Permitted Use (as defined in the Lease), unless the failure
                    to obtain such permission is due to a Tenant Delay.

               In the event of any dispute as to the date on which Landlord's
               Work has been completed, the reasonable determination of
               Landlord's architect as to such date shall be deemed conclusive
               and binding on both Landlord and Tenant.

          (3)  Incomplete Work. Landlord shall complete as soon as conditions
               practically permit any incomplete items of Landlord's Work, and
               Tenant

<PAGE>

               shall cooperate with Landlord in providing access as may be
               required to complete such work in a normal manner.

          (4)  Early Access by Tenant. Landlord shall permit Tenant access for
               installing Tenant's trade fixtures in portions of the New
               Premises prior to substantial completion with it can be done
               without material interference with remaining work or with the
               maintenance of harmonious labor relations. Any such access by
               Tenant shall be upon all of the terms and conditions of the Lease
               (other than the payment of Annual Fixed Rent) and shall be at
               Tenant's sole risk, and Landlord shall not be responsible for any
               injury to persons or damage to property resulting from such early
               access by Tenant.

          (5)  Prohibition on Access by Tenant Prior to Actual Substantial
               Completion. If, prior to the date that either the New Premises
               are in fact actually substantially complete, the New Premises are
               deemed to be substantially complete pursuant to the provisions of
               this Section (i.e. and the Commencement Date has therefore
               occurred), Tenant shall not (except with Landlord's consent) be
               entitled to take possession of the New Premises for the Permitted
               Use until the New Premises is in fact actually substantially
               complete.

     (C)  Tenant Delay.

          (1)  A "Tenant Delay" shall be defined as the following:

               (a)  Tenant's failure timely to respond to any request from
                    Landlord, Landlord's architect, Landlord's contractor and/or
                    Landlord's construction representative or to timely provide
                    all required Permit Documentation to Landlord within the
                    applicable time periods get forth in this Work Letter;

               (b)  Tenant's failure pay the Tenant Plan Excess Costs in
                    accordance with Section 1.3 of this Work Letter;

               (c)  Any delay due to items work for which there is long lead
                    time in obtaining the materials therefor or which are
                    specially or specifically manufactured, produced or milled
                    for the work in or to the New Premises and require
                    additional time for receipt or installation;

               (d)  Any delay due to changes, alterations or additions required
                    or made by Tenant with respect to items not shown on the
                    Plans including, without limitation, Change Orders; or

               (e)  Any other delays caused by Tenant, Tenant's contractors,
                    architects, engineers, or anyone else engaged by Tenant in
                    connection with the preparation of the New Premises for
                    Tenant's

<PAGE>

                    occupancy, including, without limitation, utility companies
                    and other entities furnishing communications, data
                    processing or other service, equipment, or furniture.

          (2)  Tenant Obligations with Respect to Tenant Delays.

               (a)  Tenant covenants that no Tenant Delay shall delay
                    commencement of the Term or the obligation to pay Annual
                    Fixed Rent or Additional Rent, regardless of the reason for
                    such Tenant Delay or whether or not it is within the control
                    of Tenant or any such employee. Landlord's Work shall be
                    deemed substantially completed as of the date when
                    Landlord's Work would have been substantially completed but
                    for any Tenant Delays, as determined by Landlord in the
                    exercise of its good faith business judgment.

               (b)  Tenant shall reimburse Landlord the amount, if any, by which
                    the cost of Landlord's Work is increased as the result of
                    any Tenant Delay.

               (c)  Any amounts due from Tenant to Landlord under this Section
                    1.1(C)(2) shall be due and payable within thirty (30) days
                    of billing therefor, and shall be considered to be
                    Additional Rent. Nothing contained in this Section 1.1(C)(2)
                    shall limit or qualify or prejudice any other covenants,
                    agreements, terms, previsions and conditions contained in
                    this Lease.

1.2  OUTSIDE COMPLETION DATE.

If Landlord shall have failed substantially to complete Landlord's Work in the
New Premises described in the Plans on or before the New Premises Outside
Completion Date as defined in the First Amendment to which this Work Letter is
attached (which date shall be extended automatically for such periods of time as
Landlord is prevented from proceeding with or completing the same by reason of
Landlord's Force Majeure or any act or failure to act of Tenant which interferes
with Landlord's construction of the New Premises without limiting Landlord's
other rights on account thereof), Tenant shall have the right to terminate this
First Amendment with respect to New Premises by giving notice to Landlord of
Tenant's desire to do so before such completion and within the time period from
the New Premises Outside Completion Date (as so extended) until the date which
is thirty (30) days subsequent to the New Premises Outside Completion Date (as
so extended); and, upon the giving of such notice, this First Amendment with
respect to New Premises shall cease and come to an end without further liability
or obligation on the part of either party unless, within thirty (30) days after
receipt of such notice, Landlord substantially completes Landlord's Work
respecting New Premises. Such right of termination with respect to New Premises
shall be Tenant's sole and exclusive remedy for Landlord's failure so to
complete Landlord's Work within such time and in no event shall Tenant have a
right to terminate the Lease with respect to the Initial Premises for such
failure. Each day of Tenant Delay shall be deemed conclusively to cause an

<PAGE>

equivalent day of delay by Landlord in substantially completing Landlord's Work
respecting New Premises pursuant to Section 1.1 hereof, and thereby
automatically extend for each such equivalent day of delay the date of the New
Premises Outside Completion Date.

1.3  TENANT PLAN EXCESS COSTS.

Notwithstanding anything contained in this Work Letter to the contrary, it is
understood and agreed that Tenant shall be fully responsible for the costs of
any items of work not shown on the Plans attached to this First Amendment as
Exhibit B (the "Tenant Plan Excess Costs"). To the extent, if any, that there
are Tenant Plan Excess Costs, Tenant shall pay Landlord, as Additional Rent, 50%
of the Tenant Plan Excess Costs prior to the commencement of the Landlord's
Work, with the balance of the Tenant Plan Excess Costs due upon substantial
completion of the Landlord's Work respecting New Premises; provided, however,
that in the event that the Tenant Plan Excess Costs exceed $10,000 (the "Maximum
Amount"), then Tenant shall pay to Landlord, as Additional Rent, at the time
that Tenant approves any Change Order that causes the Tenant Plan Excess Costs
to exceed the Maximum Amount, all Tenant Plan Excess Costs in excess of the
Maximum Amount.

<PAGE>

                            SECOND AMENDMENT TO LEASE

SECOND AMENDMENT TO LEASE dated as of this 24th day of July, 2006 by and between
BOSTON PROPERTIES LIMITED PARTNERSHIP, a Delaware limited partnership, the
general partner of which is Boston Properties, Inc., a Delaware corporation, as
landlord ("Landlord") and ROVING SOFTWARE INCORPORATED, a Delaware corporation,
d/b/a CONSTANT CONTACT, as tenant ("Tenant").

                                    RECITALS

     By Lease dated July 9, 2002 (the "Original Lease"), as amended by First
Amendment to Lease dated as of June 29, 2005 (the "First Amendment") Landlord
did lease to Tenant and Tenant did hire and lease from Landlord certain premises
containing 27,094 square feet of rentable floor area ("Rentable Floor Area of
Existing Premises") located on the third (3rd) floor in the building (the
"Building") commonly known as Reservoir Place Main (formerly referred to in the
Lease as "Reservoir Place II") at 1601 Trapelo Road, Waltham, Massachusetts
(referred to in the Lease as the "Premises" or "Tenant's Space", hereinafter,
the "Existing Premises"). The Original Lease, as amended by the First Amendment,
is hereinafter referred to as the "Lease".

     Tenant has determined to lease from Landlord an additional 10,335 feet of
rentable floor area ("Rentable Floor Area of Expansion Premises") on the third
(3rd) floor of the Building (the "Expansion Premises") shown on Exhibit A
attached hereto, upon the terms and conditions contained in this Second
Amendment to Lease (the "Second Amendment").

     Landlord and Tenant are entering into this instrument to set forth the
terms and conditions for the use and occupancy of the Expansion Premises and to
otherwise amend the Lease.

     NOW THEREFORE, in consideration of One Dollar ($1.00) and other good and
valuable consideration in hand this date paid by each of the parties to the
other, the receipt and sufficiency of which are hereby severally acknowledged,
and in further consideration of the mutual promises herein contained, Landlord
and Tenant hereby agree to and with each other as follows:

1.   As of the "Expansion Premises Commencement Date" (as defined in Section 2
     below) and continuing through the expiration or earlier termination of the
     Term (including the balance of the First Extended Term), the Existing
     Premises shall be expanded to include the Expansion Premises, such that the
     Existing Premises and the Expansion Premises shall constitute the
     "Premises" (and "Tenant's Space") demised to Tenant under the Lease. All
     terms and conditions of the Lease (including, without limitation, Tenant's
     right to extend the Lease Term as set forth in Section 6 of the First
     Amendment) shall apply to the Expansion Premises and Existing Premises,
     collectively, except as otherwise indicated in this Second Amendment.

2.   The following definitions are hereby added (or substituted, where
     applicable) to the REFERENCE DATA in Section 1.1 of the Lease:

<PAGE>

     EXPANSION PREMISES   May 1, 2008.
     COMMENCEMENT DATE:

     BROKER               McCall & Almy
                          One Post Office Square, 37th Floor
                          Boston, Massachusetts 02109

3.   ANNUAL FIXED RENT.

     (A) With respect to the Existing Premises, Annual Fixed Rent shall be paid
     as currently provided in the Lease.

     (B) With respect to the Expansion Premises, commencing on the Expansion
     Premises Commencement Date and continuing through the expiration of the
     First Extended Term, Annual Fixed Rent for the Expansion Premises shall be
     payable at the annual rate of Two Hundred and Eighty Nine Thousand Three
     Hundred and Eighty 00/100 Dollars ($289,380.00) (being the product of (i)
     $28.00 and (ii) the Rentable Floor Area of Expansion Premises (being 10,
     335 square feet)).

4.   Effective as of the Expansion Premises Commencement Date and continuing
     through the expiration of the Term, the following definitions are hereby
     added to the REFERENCE DATA in Section 1.1 of the Lease:

     NUMBER OF PARKING        Beginning on the Expansion Premises Commencement
     PRIVILEGES FOR THE       Date, there shall be added additional privileges
     EXPANSION PREMISES:      for parking thirty-six (36) automobiles, ten (10)
                              of which are located in the garage below the
                              Building, and twenty-six (26) of which will be
                              located on the outdoor surface lot.

     RENTABLE FLOOR AREA OF   10,335 square feet.
     EXPANSION PREMISES:

5.   OPERATING EXPENSES.

     (A) Existing Premises. For purposes of calculating Tenant's payments for
     Operating Expenses for the Existing Premises pursuant to Section 2.6 of the
     Lease, the definition of "Base Operating Expenses" contained in Paragraph
     8(A) of the First Amendment shall be unchanged.

     (B) Expansion Premises. In addition to the payments referenced in Section
     5(A) above, Tenant shall pay Operating Expenses for the Expansion Premises
     to be calculated as follows: For purposes of calculating Tenant's payments
     for Operating Expenses for the Expansion Premises pursuant to Section 2.6
     of the Lease for that portion of the First Extended Term on and after the
     Expansion Premises Commencement Date, with respect to the Expansion
     Premises only, the definition of "Base Operating Expenses" shall be:

<PAGE>

          BASE OPERATING   Landlord's Operating Expenses (as defined in Section
          EXPENSES:        2.6 of the Lease) for calendar year 2008 being
                           January 1, 2008 through December 31, 2008.

6.   REAL ESTATE TAXES.

     (A) Existing Premises. For purposes of calculating Tenant's payments for
     real estate taxes for the Existing Premises pursuant to Section 2.7 of the
     Lease, the definition of "Base Taxes" contained in Paragraph 8(B) of the
     First Amendment shall be unchanged.

     (B) Expansion Premises. In addition to the payments referenced in Section
     6(A) above, Tenant shall pay real estate taxes for the Expansion Premises
     to be calculated as follows: For purposes of calculating Tenant's payments
     for real estate taxes for the Expansion Premises pursuant to Section 2.7 of
     the Lease for that portion of the First Extended Term on and after the
     Expansion Premises Commencement Date, with respect to the Expansion
     Premises only, the definition of "Base Taxes" shall be:

     BASE TAXES:   Landlord's Tax Expenses (as defined in Section 2.7 of the
                   Lease) for fiscal tax year 2009 being July 1, 2008 through
                   June 30, 2009.

7.   Condition of the Expansion Premises. Tenant shall accept the Expansion
     Premises in their "AS-IS" condition without any obligation on the
     Landlord's part to perform any additions, alterations, improvements,
     demolition or other work therein or pertaining thereto or to install or
     connect any of Tenant's telephone or other communications equipment or
     systems or to provide any allowance.

8.   Yield-Up.

     (a) Notwithstanding the provisions of Section 5.2 of the Lease to the
     contrary, with respect to the condition in which Tenant must yield up the
     Premises at the expiration or termination of the Term, Tenant shall not be
     required to remove any alterations or additions (i) made by Oce Imagistics,
     Inc. ("Imagistics") prior to the commencement of the term of that certain
     sublease from Imagistics to Tenant dated as of the date of this Second
     Amendment (the "Sublease"), and consented to by Landlord pursuant to that
     certain Consent Agreement by and among Landlord, Tenant and Imagistics
     dated as of the date hereof; and (ii) made by Tenant to the extent shown on
     the Plans dated May 15, 2006 prepared by Visnick & Caulfield and known as
     A-O Cover sheet, D-1 Demolition Plan, A-1 Furniture Plan, A-2 Partition
     Plan, A-3 Electrical & Tele/Data Plan, A-4 Reflected Ceiling Plan, A-5
     Finish Plan, A-6 Details and plans dated May 15, 2006 prepared by AHA
     Consulting Engineers and known as FP-3 Fire Protection, Partial third floor
     plan and FA-3 Fire Alarm, Partial third floor plan, as modified by letter
     dated June 8, 2006 from Michael J. Schumacher to Marcus Green of Tenant
     (collectively, the "Sublease Plans"), all of which Plans have previously
     been delivered to Landlord. Provided, however, notwithstanding the
     foregoing, Tenant shall in all events remain obligated to remove the wiring
     for Tenant's computer, telephone and other

<PAGE>

     communication systems and equipment, unless Landlord, by notice to Tenant
     given at least forty-five (45) days before the expiration or termination of
     the Term, specifies that such wiring need not be removed.

     (b) Commencing on the Expansion Premises Commencement Date, Sections 3.3
     and 5.2 of the Lease are amended as follows:

          (i)  Section 3.3. Add the following phrase to the beginning of the
               last complete sentence on page 21 of the Lease: "Except for any
               alterations or additions that Tenant requests to remain in the
               Premises in Tenant's notice seeking Landlord's consent for the
               installation thereof (which notice shall specifically refer to
               this Section 3.3) and for which Landlord specifically agrees in
               writing may remain,"; and

          (ii) Section 5.2. Add the following parenthetical after the words
               "before such expiration or termination" in subsection (iii) of
               Section 5.2: "(unless otherwise specified by Landlord as set
               forth in Section 3.3)".

     Except as expressly provided in this paragraph, all other terms and
     conditions of Section 5.2 shall continue to apply to the Premises and shall
     remain in full force and effect.

9.   Commencing on the Expansion Premises Commencement Date, Section 3.3 of the
     Lease is amended to add the following sentence after the seventh sentence
     of the existing paragraph:

     "With respect to alterations and additions to Tenant's space for which a
     building permit is not required under applicable Legal Requirements only,
     Landlord agrees that it shall not delay its review and approval (or
     disapproval, as applicable) of the plans and specifications submitted by
     Tenant, for more than five (5) business days after receipt such plans and
     specifications. The foregoing sentence shall not apply to, and shall in no
     way affect or limit, Landlord's rights and obligations with respect to the
     review and approval of plans and specifications for all other alterations
     and additions proposed by Tenant."

10.  Commencing on the date of this Second Amendment, Section 5.6.1.1 of the
     Lease is amended as follows:

     (a) Delete the words beginning in the second line of the paragraph, "the
     whole (but not part), of the Premises (no partial subletting being
     permitted other than as provided in Section 5.6.1)" and substitute therefor
     the words, "all or a portion of the Premises" and

     (b) Add the following paragraph to the end of the existing paragraph:

          "In addition to the other requirements set forth in this Lease and
          notwithstanding any other provision of this Lease, partial sublettings
          of the Premises shall only be permitted under the following terms and
          conditions: (i) the layout of both the subleased premises and the
          remainder of the Premises must comply with applicable laws,
          ordinances, rules and/or regulations and be

<PAGE>

          approved by Landlord, which approval shall not be unreasonably
          withheld, conditioned or delayed, including, without limitation, all
          requirements concerning access and egress; (ii) in the event the
          subleased premises are separately physically demised from the
          remainder of the Premises, Tenant shall pay all costs of separately
          physically demising the subleased premises; and (iii) in no event
          shall there exist more than three (3) partial subleases at any one
          time during the Term."

     (c) During the term of the Sublease, in connection with any reference in
     the Lease to a partial sublease of the "Premises," the term "Premises"
     shall refer collectively to the Premises and the subleased premises
     subleased by Tenant, as subtenant, under the Sublease.

11.  Right of First Offer.

     As of the date hereof, 4,876 feet of rentable floor area on the third (3rd)
     floor of the Building shown on Exhibit B attached hereto (the "Offer
     Space") is available for lease. Subsequent to the date of this Second
     Amendment, and provided that at the time Landlord elects to offer the Offer
     Space to Tenant for reletting (i) no "Event of Default" (as defined in
     Section 7.1 of the Lease exists and there have been no more than two (2)
     Event of Default occurrences during the Term, (ii) Tenant has not assigned
     this Lease (except for assignments permitted under Section 5.6.1 of the
     Lease) or sublet more than ten percent (10%) of the Rentable Floor Rea of
     Tenant's Space, and (iii) the Lease is still in full force and effect,
     Landlord agrees not to enter into a lease or leases to relet such Offer
     Space without first giving to Tenant an opportunity to lease such space for
     the Annual Market Rent (as hereinafter defined) as determined by Landlord.
     The Annual Market Rent shall be the annual fair market rent for such space
     as of the date when the same becomes so available for reletting, based upon
     the use of such space as first class office space utilizing properties of
     similar character within the Boston West Suburban market (including similar
     premises within the Complex if at the time such quotation is requested such
     premises shall be available for rent). When Landlord is in discussions with
     a third party to lease the Offer Space and has negotiated with such third
     party an annual fixed rent and length of term for the Offer Space that
     Landlord wishes to accept in order to proceed to the letter of intent stage
     with such third party, which may be at any time after the date of this
     Second Amendment, in Landlord's sole discretion. Landlord shall notify
     Tenant (the "Offer Notice") of the availability of such Offer Space and
     shall advise Tenant of the Annual Market Rent and other business terms upon
     which Landlord is willing to lease such Offer Space. If Tenant wishes to
     exercise Tenant's right of first offer, Tenant shall do so, if at all, by
     giving Landlord notice of Tenant's desire to lease the entire amount of
     such Offer Space (it being agreed that Tenant has no right to lease less
     than the entire amount of the Offer Space which is so available) on the
     terms provided herein within fifteen (15) days after receipt of Landlord's
     Offer Notice, time being of the essence. If Tenant shall give such notice
     the same shall constitute an agreement to enter into an instrument in
     writing to lease such Offer Space within twenty (20) business days after
     receipt of such instrument from Landlord upon all of the same terms and
     conditions in this Lease except for the provisions of this Section, the
     Annual

<PAGE>

     Fixed Rent which shall be equal to the Annual Market Rent as quoted by
     Landlord, such other business terms set forth in Landlord's Offer Notice as
     aforesaid and those provisions which are inappropriate to the business
     agreement. If Tenant shall not so exercise such right within such period,
     time being of the essence in respect of such exercise, Tenant shall have no
     further right of first offer hereunder and Landlord shall be free to enter
     into a lease or leases of such Offer Space or portions thereof with another
     prospective tenant or tenants upon terms and conditions as Landlord shall
     determine, which terms may include rights or options to extend the term or
     to expand the size of the premises under such lease or leases, provided,
     however, it is agreed that if Landlord does not so lease such space during
     the three month period following the date of Landlord's Offer Notice for an
     annual market rent that is equal to or greater than ninety percent (90%) of
     the Annual Market Rent quoted by Landlord in the Offer Notice, then terms
     of this Section shall continue to apply to such Offer Space.

     If Tenant shall exercise any such right of first offer and if, thereafter,
     the then occupant of the premises with respect to which Tenant shall have
     so exercised such right wrongfully fails to deliver possession of such
     premises at the time when its tenancy is scheduled to expire, Landlord
     shall use reasonable efforts and due diligence (which shall be limited to
     the commencement and prosecution thereafter of eviction proceedings but
     which shall not require the taking of any appeal) to evict such occupant
     from such space and; to deliver possession of such space to Tenant as soon
     as may be practicable. Commencement of the term of Tenant's occupancy and
     lease of such additional space shall, in the event of such holding over by
     such occupant, be deferred until possession of the additional space is
     delivered to Tenant. The failure of the then occupant of such premises to
     so vacate shall not constitute a default or breach by Landlord and shall
     not give Tenant any right to terminate this Lease or to deduct from, offset
     against or withhold Annual Fixed Rent or additional rent (or any portions
     thereof).

12.  Notwithstanding Section 8.15 of the Lease, upon execution and delivery of
     this Second Amendment, Landlord will use "reasonable efforts" as defined in
     Section 8.15 of the Lease, to obtain a non-disturbance, subordination and
     attornment agreement from Landlord's current mortgagee on such mortgagee's
     then current standard form of agreement ("Lender SNDA"), with such changes
     that are mutually acceptable to the parties thereto. In the event that
     Tenant requests changes to any standard Lender SNDA form, Tenant shall be
     responsible for all costs and expenses incurred by Landlord or any such
     mortgagee in connection with the review, negotiation and execution thereof
     including, but not limited to, attorneys fees. Landlord's failure to obtain
     a Lender SNDA for Tenant shall have no effect on the rights, obligations
     and liabilities of Landlord and Tenant or be considered to be a default by
     Landlord hereunder.

13.  Tenant represents that simultaneous with the execution of this Second
     Amendment, Tenant and Imagistics have executed the Sublease. Subject to the
     execution and delivery by Tenant and Imagistics of the Sublease, and the
     execution and delivery by Tenant, Imagistics and Landlord of Landlord's
     Consent, Landlord represents that the term of Landlord's lease with
     Imagistics, to which the Sublease is subordinate, is scheduled to expire on
     April 30, 2008. Landlord and Tenant acknowledge and agree that the Lease

<PAGE>

     Term is currently scheduled to expire on September 30, 2010, unless further
     extended by Tenant for the Second Extended Term as provided in Section 6 of
     the First Amendment.

14.  (A) Tenant warrants and represents that Tenant has not dealt with any
     broker in connection with the consummation of this Second Amendment other
     than the Broker referenced above; and in the event any claim is made
     against Landlord relative to dealings by Tenant with brokers other than the
     Broker, Tenant shall defend the claim against Landlord with counsel of
     Tenant's selection first approved by Landlord (which approval will not be
     unreasonably withheld) and save harmless and indemnify Landlord on account
     of loss, cost or damage which may arise by reason of such claim.

     (B) Landlord warrants and represents that Landlord has not dealt with any
     broker in connection with the consummation of this Second Amendment other
     than the Broker referenced above; and in the event any claim is made
     against Tenant relative to dealings by Landlord with brokers other than the
     Broker, Landlord shall defend the claim against Tenant with counsel of
     Landlord's section and save harmless and indemnify Tenant on account of
     loss, cost or damage which may arise by reason of such claim.

15.  Except as otherwise expressly provided herein, all capitalized terms used
     herein without definition shall have the same meanings as are set forth in
     the Lease.

16.  Except as herein amended the Lease shall remain unchanged and in full force
     and effect. All references to the "Lease" shall be deemed to be references
     to the Lease as herein amended.

                           [Signature page to follow.]

<PAGE>

     EXECUTED as a sealed instrument as of the date and year first above
written.

WITNESS:                                LANDLORD:
                                        BOSTON PROPERTIES LIMITED PARTNERSHIP
                                        By BOSTON PROPERTIES, INC.,
                                        Its general partner

/s/ [illegible]                         By /s/ David C. Provost
-------------------------------------      -------------------------------------
                                        Name David C. Provost
                                        Title Senior Vice President
                                              Boston Properties

ATTEST:                                 TENANT:
                                        ROVING SOFTWARE INCORPORATED

By: /s/ Steven R. Wasserman             By /s/ Steven R. Wasserman
    ---------------------------------      -------------------------------------
Name: Steven R. Wasserman               Name Steven R. Wasserman
Title: Secretary                        Title (VICE PRESIDENT)
                                              HERETO DULY AUTHORIZED

                                        By /s/ Marcus Green
                                           -------------------------------------
                                        Name Marcus Green
                                        Title ASSISTANT TREASURER
                                              HERETO DULY AUTHORIZED

                                        (CORPORATE SEAL)

<PAGE>

                                    EXHIBIT A

                           Plan of Expansion Premises

                          [IMAGE OF EXPANSION PREMISES]

<PAGE>

                                    EXHIBIT B

                               Plan of Offer Space

                              [IMAGE OF OFFER SPACE]
<PAGE>

                            THIRD AMENDMENT TO LEASE

THIRD AMENDMENT TO LEASE dated as of this 27th day of February, 2007 by and
between BOSTON PROPERTIES LIMITED PARTNERSHIP, a Delaware limited partnership,
the general partner of which is Boston Properties, Inc., a Delaware corporation,
as landlord ("Landlord") and CONSTANT CONTACT, INC., a Delaware corporation, as
tenant ("Tenant").

                                    RECITALS

     By Lease dated July 9, 2002 (the "Original Lease"), as amended by First
Amendment to Lease dated as of June 29, 2005 (the "First Amendment"), and Second
Amendment to Lease dated as of July 24, 2006 (the "Second Amendment") (the
Original Lease, as amended by the First Amendment and the Second Amendment,
hereinafter referred to as the "Lease"), Landlord did lease to Tenant and Tenant
did hire and lease from Landlord certain premises containing 37,429 square feet
of rentable floor area ("Rentable Floor Area of Existing Premises") located on
the third (3rd) floor in the building (the "Building") commonly known as
Reservoir Place Main (formerly referred to in the Lease as "Reservoir Place II")
at 1601 Trapelo Road, Waltham, Massachusetts (referred to in the Lease as the
"Premises" or "Tenant's Space", hereinafter, the "Existing Premises"). The
parties further acknowledge that the term has not yet commenced with respect to
a portion of the Existing Premises (i.e., the "Expansion Premises", as such term
is defined in the Second Amendment), and that Tenant is currently subleasing
such space pursuant to a separate sublease agreement.

     Tenant has determined to lease from Landlord an additional 13,276 feet of
rentable floor area ("Rentable Floor Area of Third Expansion Premises") on the
third (3rd) floor of the Building (the "Third Expansion Premises") shown on
Exhibit A attached hereto, upon the terms and conditions contained in this Third
Amendment to Lease (the "Third Amendment"). The Third Expansion Premises is
comprised of the "Third Expansion Premises A," which is 8,400 feet of rentable
floor area ("Rentable Floor Area of the Third Expansion Premises A") as shown on
Exhibit A, and the "Third Expansion Premises B," which is 4,876 feet of rentable
floor area ("Rentable Floor Area of the Third Expansion Premises B") as shown on
Exhibit A.

     Landlord and Tenant are entering into this instrument to set forth the
terms and conditions for the use and occupancy of the Third Expansion Premises
and to otherwise amend the Lease.

     NOW THEREFORE, in consideration of One Dollar ($1.00) and other good and
valuable consideration in hand this date paid by each of the parties to the
other, the receipt and sufficiency of which are hereby severally acknowledged,
and in further consideration of the mutual promises herein contained, Landlord
and Tenant hereby agree to and with each other as follows:

1.   (A) As of the "Third Expansion Premises A Commencement Date" (as defined in
     Section 2 below) and continuing through the expiration or earlier
     termination of the Term (including the balance of the First Extended Term),
     the Existing Premises shall be expanded to include the Third Expansion
     Premises A, such that the Existing Premises and the Third Expansion
     Premises A shall constitute the "Premises" (and "Tenant's Space") demised
     to Tenant under the Lease. All terms and conditions of the Lease
     (including,

<PAGE>

     without limitation, Tenant's right to extend the Lease Term as set forth in
     Section 6 of the First Amendment) shall apply to the Third Expansion
     Premises A and Existing Premises, collectively, except as otherwise
     indicated in this Third Amendment.

     (B) As of the "Third Expansion Premises B Commencement Date" (as defined in
     Section 2 below) and continuing through the expiration or earlier
     termination of the Term (including the balance of the First Extended Term),
     the Existing Premises shall be expanded to include the Third Expansion
     Premises B, such that the Existing Premises and the Third Expansion
     Premises B shall constitute the "Premises" (and "Tenant's Space") demised
     to Tenant under the Lease. All terms and conditions of the Lease
     (including, without limitation, Tenant's right to extend the Lease Term as
     set forth in Section 6 of the First Amendment) shall apply to the Third
     Expansion Premises B and Existing Premises, collectively, except as
     otherwise indicated in this Third Amendment.

2.   The following definitions are hereby added (or substituted, where
     applicable) to the REFERENCE DATA in Section 1.1 of the Lease:

<TABLE>
<S>                                     <C>
THIRD EXPANSION PREMISES
A COMMENCEMENT DATE                     The earlier to occur of (i) the date
                                        that is sixty (60) days after Landlord
                                        provides Tenant with early access to all
                                        of the Third Expansion Premises A as
                                        provided under Section 7.5 of this Third
                                        Amendment, or (ii) the date on which
                                        Tenant commences beneficial use of the
                                        Third Expansion Premises A for its
                                        business purposes.

THIRD EXPANSION PREMISES A
RENT COMMENCEMENT DATE:                 Thirty (30) days after the Third
                                        Expansion Premises A Commencement Date.

THIRD EXPANSION PREMISES
EXPIRATION DATE:                        September 30, 2010, to be coterminous
                                        with the Term

LANDLORD'S CONSTRUCTION
REPRESENTATIVE:                         Michael Schumacher

TENANT'S CONSTRUCTION
REPRESENTATIVE:                         David Mann and Steven Wasserman, either
                                        of whom individually may act on Tenant's
                                        behalf.

THIRD EXPANSION PREMISES B
COMMENCEMENT DATE:                      March 1, 2007.
</TABLE>

<PAGE>

<TABLE>
<S>                                     <C>
THIRD EXPANSION PREMISES B RENT
COMMENCEMENT DATE:                      July 1, 2007

ADDITIONAL SECURITY DEPOSIT:            $91,375.00

BROKER:                                 McCall & Almy
                                        One Post Office Square, 37th Floor
                                        Boston, Massachusetts 02109
</TABLE>

3.   ANNUAL FIXED RENT.

     (A) With respect to the Existing Premises, Annual Fixed Rent shall be paid
     as currently provided in the Lease.

     (B) With respect to the Third Expansion Premises A Annual Fixed Rent for
     the Third Expansion Premises A shall be payable as follows:

          (i) Commencing on the Third Expansion Premises A Rent Commencement
          Date and continuing for the next twelve calendar months of the Term
          (plus the partial month, if any, immediately following the Third
          Expansion Premises A Rent Commencement Date) at the annual rate of
          Two Hundred and Forty Three Thousand Six Hundred 00/100 Dollars
          ($243,600.00) (being the product of (i) $29.00 and (ii) the Rentable
          Floor Area of the Third Expansion Premises A (being 8,400 square
          feet));

          (ii) During the next twelve (12) calendar months of the Term, at the
          annual rate of Two Hundred and Fifty Two Thousand 00/100 Dollars
          ($252,000.00) (being the product of (i) $30.00 and (ii) the Rentable
          Floor Area of the Third Expansion Premises A); and

          (iii) Thereafter and continuing through the expiration of the Term, at
          the annual rate of Two Hundred and Sixty Thousand Four Hundred 00/100
          Dollars ($260,400.00) (being the product of (i) $31.00 and (ii) the
          Rentable Floor Area of the Third Expansion Premises A).

     (C) With respect to the Third Expansion Premises B, Annual Fixed Rent for
     the Third Expansion Premises B shall be payable as follows:

          (i) Commencing on the Third Expansion Premises B Rent Commencement
          Date and continuing for the next twelve calendar months of the Term
          (plus the partial month, if any, immediately following the Third
          Expansion Premises B Rent Commencement Date) at the annual rate of One
          Hundred and Twenty One Thousand Nine Hundred 00/100 Dollars
          ($121,900.00) (being the product of (i) $25.00 and (ii) the Rentable
          Floor Area of the Third Expansion Premises B (being 4,876 square
          feet));

          (ii) During the next twelve (12) calendar months of the Term, at the
          annual rate of One Hundred and Twenty Six Thousand Seven Hundred and
          Seventy Six 00/100 Dollars ($126,776.00) (being the product of (i)
          $26.00 and (ii) the Rentable Floor Area of the Third Expansion
          Premises B); and

          (iii) Thereafter and continuing through the expiration of the Term, at
          the annual rate of One Hundred and Thirty One Thousand Six Hundred and
          Fifty Two 00/100 Dollars ($131,652.00) (being the product of (i)
          $27.00 and (ii) the Rentable Floor Area of the Third Expansion
          Premises B).

4.   (A) Effective as of the Third Expansion Premises A Commencement Date and
     continuing through the expiration of the Term, the following definitions
     are hereby added to the REFERENCE DATA in Section 1.1 of the Lease:

<TABLE>
<S>                                        <C>
NUMBER OF PARKING PRIVILEGES FOR THE       Beginning on the Third Expansion
THIRD EXPANSION PREMISES A:                Premises A Commencement Date, there
                                           shall be added additional privileges
                                           for parking twenty nine (29) automobiles,
                                           eight (8) of which are located in the
                                           garage below the Building, and
                                           twenty-one (21) of which will be located
                                           on the outdoor surface lot.

</TABLE>

<PAGE>

<TABLE>
<S>                                     <C>
RENTABLE FLOOR AREA OF THE THIRD        8,400 square feet.
EXPANSION PREMISES A:
</TABLE>

     (B) Effective as of the Third Expansion Premises B Commencement Date and
     continuing through the expiration of the Term, the following definitions
     are hereby added to the REFERENCE DATA in Section 1.1 of the Lease:

<TABLE>
<S>                                     <C>
NUMBER OF PARKING PRIVILEGES FOR THE    Beginning on the Third Expansion
THIRD EXPANSION PREMISES B:             Premises B Commencement Date, there
                                        shall be added additional privileges for
                                        parking seventeen (17) automobiles, five
                                        (5) of which are located in the garage
                                        below the Building, and twelve (12) of
                                        which will be located on the outdoor
                                        surface lot.

RENTABLE FLOOR AREA OF THE THIRD        4,876 square feet.
EXPANSION PREMISES B:
</TABLE>

5.   OPERATING EXPENSES.

     (A) Existing Premises. For purposes of calculating Tenant's payments for
     Operating Expenses for the Existing Premises pursuant to Section 2.6 of the
     Lease, the definition of "Base Operating Expenses" shall be unchanged.

     (B) Third Expansion Premises A. In addition to the payments referenced in
     Section 5(A) above, Tenant shall pay Operating Expenses for the Third
     Expansion Premises A to be calculated as follows: For purposes of
     calculating Tenant's payments for Operating Expenses for the Third
     Expansion Premises A pursuant to Section 2.6 of the Lease for that portion
     of the Term on and after the Third Expansion Premises A Commencement Date,
     with respect to the Third Expansion Premises A only, the definition of
     "Base Operating Expenses" shall be:

<TABLE>
<S>                                     <C>
BASE OPERATING EXPENSES:                Landlord's Operating Expenses (as
                                        defined in Section 2.6 of the Lease) for
                                        calendar year 2007 being January 1, 2007
                                        through December 31, 2007.
</TABLE>

     (C) Third Expansion Premises B. In addition to the payments referenced in
     Section 5(A) above, Tenant shall pay Operating Expenses for the Third
     Expansion Premises B to be calculated as follows: For purposes of
     calculating Tenant's payments for Operating Expenses for the Third
     Expansion Premises B pursuant to Section 2.6 of the Lease for that portion
     of the Term on and after the Third Expansion Premises B Commencement

<PAGE>

     Date, with respect to the Third Expansion Premises B only, the definition
     of "Base Operating Expenses" shall be:

<TABLE>
<S>                                     <C>
BASE OPERATING EXPENSES:                Landlord's Operating Expenses (as
                                        defined in Section 2.6 of the Lease) for
                                        calendar year 2007 being January 1, 2007
                                        through December 31, 2007.
</TABLE>

     (D) Notwithstanding the foregoing or any provision hereof to the contrary,
     Tenant shall not be obligated to pay any of Landlord's Operating Expenses
     allocable to the Third Expansion Premises A and/or the Third Expansion
     Premises B for any period prior to January 1, 2008.

6.   REAL ESTATE TAXES

     (A) Existing Premises. For purposes of calculating Tenant's payments for
     real estate taxes for the Existing Premises pursuant to Section 2.7 of the
     Lease, the definition of "Base Taxes" shall be unchanged.

     (B) Third Expansion Premises A. In addition to the payments referenced in
     Section 6(A) above, Tenant shall pay real estate taxes for the Third
     Expansion Premises A to be calculated as follows: For purposes of
     calculating Tenant's payments for real estate taxes for the Third Expansion
     Premises A pursuant to Section 2.7 of the Lease for that portion of the
     Term on and after the Third Expansion Premises A Commencement Date, with
     respect to the Third Expansion Premises A only, the definition of "Base
     Taxes" shall be:

<TABLE>
<S>                                     <C>
BASE TAXES:                             Landlord's Tax Expenses (as defined in
                                        Section 2.7 of the Lease) for fiscal tax
                                        year 2008 being July 1, 2007 through
                                        June 30, 2008.
</TABLE>

     (C) Third Expansion Premises B. In addition to the payments referenced in
     Section 6(A) above, Tenant shall pay real estate taxes for the Third
     Expansion Premises B to be calculated as follows: For purposes of
     calculating Tenant's payments for real estate taxes for the Third Expansion
     Premises B pursuant to Section 2.7 of the Lease for that portion of the
     Term on and after the Third Expansion Premises B Commencement Date, with
     respect to the Third Expansion Premises B only, the definition of "Base
     Taxes" shall be:

<TABLE>
<S>                                     <C>
BASE TAXES:                             Landlord's Tax Expenses (as defined in
                                        Section 2.7 of the Lease) for fiscal tax
                                        year 2008 being July 1, 2007 through
                                        June 30, 2008.
</TABLE>

     (D) Notwithstanding the foregoing or any provision hereof to the contrary,
     Tenant shall not be obligated to pay any of Landlord's Tax Expenses
     allocable to the Third Expansion Premises A and/or the Third Expansion
     Premises B for any period prior to July 1, 2008.

<PAGE>

7.   Condition of the Third Expansion Premises. Tenant shall accept the Third
     Expansion Premises A and Third Expansion Premises B, respectively, in their
     "AS-IS" condition without any obligation on the Landlord's part to perform
     any additions, alterations, improvements, demolition or other work therein
     or pertaining thereto or to install or connect any of Tenant's telephone or
     other communications equipment or systems or to provide any allowance,
     except as provided below. Notwithstanding the foregoing, Landlord
     represents and warrants that as of the Third Expansion Premises A
     Commencement Date, and the Third Expansion Premises B Commencement Date,
     respectively, the HVAC system and all other building systems serving the
     Third Expansion Premises A and Third Expansion Premises B will be in good
     order, condition and repair.

7.1  Third Expansion Premises A Work

     (A) Tenant, at its sole cost and expense, shall perform all work necessary
     to prepare the Third Expansion Premises A for Tenant's occupancy (the
     "Third Expansion Premises A Work"). Landlord acknowledges that it has
     approved the work described in the area designated as "Phase 3B Exterior
     Suite" (the "Exterior Suite Area") on the schematic plans attached hereto
     as Exhibit E (the "Tenant's Schematic Plans"). The Third Expansion Premises
     A Work shall be performed in accordance with plans and specifications
     prepared by an architect, licensed by the Commonwealth of Massachusetts and
     reasonably approved by Landlord (the "Third Expansion Premises A
     Architect"), such plans and specifications to be subject to the reasonable
     approval of the Landlord, but Landlord may not disapprove of matters shown
     on, and consistent with, the Exterior Suite Area of the Tenant's Schematic
     Plans. Without limiting the generality of the foregoing, Tenant shall have
     the right to use Visnick & Caulfield Associates, Inc. as the Third
     Expansion Premises A Architect for the Third Expansion Premises A Work.
     Tenant shall submit to Landlord a detailed floor plan layout together with
     working drawings for the Third Expansion Premises A Work to prepare the
     Third Expansion Premises A for Tenant's occupancy. Such floor plan layout
     and working drawings (the "Third Expansion Premises A Plans") shall contain
     at least the information required by, and shall conform to the requirements
     of, Exhibit B. Provided that the Third Expansion Premises A Plans contain
     at least the information required by, and conform to the requirements of,
     said Exhibit B, Landlord's approval of the Third Expansion Premises A Plans
     shall not be unreasonably withheld or delayed (said approval to be given
     within five (5) business days of Landlord's receipt of three (3) copies of
     such plans and specifications); however, Landlord's determination of
     matters relating to aesthetic issues relating to alterations or changes
     which are visible outside the Premises shall be in Landlord's sole
     discretion. If Landlord disapproves of any Third Expansion Premises A
     Plans, then Tenant shall promptly have the Third Expansion Premises A Plans
     revised by its architect to incorporate all objections and conditions
     presented by Landlord and shall resubmit such plans to Landlord no later
     than seven (7) days after Landlord has submitted to Tenant its objections
     and conditions. Such process shall be followed until the Third Expansion
     Premises A Plans shall have been approved by the Landlord without objection
     or condition.

<PAGE>

     (B) Once the Third Expansion Premises A Plans have been approved by
     Landlord, Tenant, at its sole cost and expense, shall promptly, and with
     all due diligence, perform the Third Expansion Premises A Work as set forth
     on the Third Expansion Premises A Plans, and, in connection therewith,
     Tenant shall obtain all necessary governmental permits and approvals for
     the Third Expansion Premises A Work.

7.2  Third Expanded Premises B Work

     (A) Tenant, at its sole cost and expense, shall perform all work necessary
     to prepare the Third Expansion Premises B for Tenant's occupancy (the
     "Third Expansion Premises B Work"), and together with the Third Expansion
     Premises A Work, the "Tenant's Work"). Landlord acknowledges that it has
     approved the work described in the area designated as "Phase 3A Atrium
     Suite" (the "Atrium Suite Area") on Tenant's Schematic Plans. The Third
     Expansion Premises B Work shall be performed in accordance with plans and
     specifications prepared by an architect, licensed by the Commonwealth of
     Massachusetts and reasonably approved by Landlord (the "Third Expansion
     Premises B Architect"), such plans and specifications to be subject to the
     reasonable approval of the Landlord, but Landlord may not disapprove of
     matters shown on, and consistent with, the Atrium Suite Area of the
     Tenant's Schematic Plans. Without limiting the generality of the foregoing,
     Tenant shall have the right to use Visnick & Caulfield Associates, Inc. as
     the Third Expansion Premises B Architect for the Third Expansion Premises B
     Work. Tenant shall submit to Landlord, a detailed floor plan layout
     together with working drawings for the Third Expansion Premises B Work to
     prepare the Third Expansion Premises B for Tenant's occupancy. Such floor
     plan layout and working drawings (the "Third Expansion Premises B Plans")
     shall contain at least the information required by, and shall conform to
     the requirements of, Exhibit B. Provided that the Third Expansion Premises
     B Plans contain at least the information required by, and conform to the
     requirements of, said Exhibit B, Landlord's approval of the Third Expansion
     Premises B Plans shall not be unreasonably withheld or delayed (said
     approval to be given within five (5) business days of Landlord's receipt of
     three (3) copies of such plans and specifications); however, Landlord's
     determination of matters relating to aesthetic issues relating to
     alterations or changes which are visible outside the Premises shall be in
     Landlord's sole discretion. If Landlord disapproves of any Third Expansion
     Premises B Plans, then Tenant shall promptly have the Third Expansion
     Premises B Plans revised by its architect to incorporate all objections and
     conditions presented by Landlord and shall resubmit such plans to Landlord
     no later than seven (7) days after Landlord has submitted to Tenant its
     objections and conditions. Such process shall be followed until the Third
     Expansion Premises B Plans shall have been approved by the Landlord without
     objection or condition.

     (B) Once the Third Expansion Premises B Plans have been approved by
     Landlord, Tenant, at its sole cost and expense, shall promptly, and with
     all due diligence, perform the Third Expansion Premises B Work as set forth
     on the Third Expansion Premises B Plans, and, in connection therewith,
     Tenant shall obtain all necessary governmental permits and approvals for
     the Third Expansion Premises B Work.

<PAGE>

7.3  Quality and Performance of Work

     All of Tenant's Work shall be performed strictly in accordance with Section
     3.3 of the Lease. Tenant shall have Tenant's Work performed by contractors,
     reasonably approved by Landlord, which contractors shall provide to
     Landlord such insurance as the Landlord may reasonably require. Without
     limiting the generality of the foregoing, and subject to all applicable
     terms and conditions of the Lease, Tenant shall have the right to use
     Majestic Construction, Inc., as the general contractor for the Tenant's
     Work. Landlord shall have the right to provide such reasonable rules and
     regulations relative to the performance of Tenant's Work and other work
     which the Tenant may perform under this Lease and tenant shall abide by all
     such reasonable rules and regulations and shall cause all of its
     contractors to so abide including, without limitation, payment for the
     costs of using Building services. It shall be Tenant's obligation to obtain
     a certificate of occupancy or other like governmental approval for the use
     and occupancy of the Third Expansion Premises to the extent required by
     law, and Tenant shall not occupy the Third Expansion Premises for the
     conduct of business until and unless it has obtained such approval and has
     submitted to Landlord a copy of the same. Additionally, Tenant shall
     provide waivers of lien from all of Tenant's general contractors,
     subcontractors and suppliers performing work of Five Thousand and 00/100
     Dollars or more, in the aggregate, in the recordable forms attached hereto
     as Exhibit D. Tenant shall also prepare and submit to Landlord promptly
     after Tenant's Work is substantially complete a set of as-built plans in
     both print and electronic forms showing the work performed by Tenant to the
     Premises. To the extent the same may be shown in the as-built plans
     prepared for Tenant from its existing vendor, such plans shall include,
     without limitation, any wiring or cabling installed by Tenant or Tenant's
     contractor for Tenant's computer, telephone and other communication
     systems. Within thirty (30) days after receipt of an invoice from Landlord,
     Tenant shall pay to Landlord, as Additional Rent, an amount equal to the
     sum of (i) third party expenses incurred by Landlord to review any elements
     of Tenant's Plans and Tenant's Work that may affect the structure of the
     Building, and (ii) third party expenses incurred by Landlord to review
     Tenant's Plans and Tenant's Work of which Tenant has received advance
     notice and which Tenant, in its commercially reasonable determination, has
     approved. All of Tenant's Work shall be coordinated with any work being
     performed by or for Landlord and in such manner as to maintain harmonious
     labor relations. Each party may inspect the work of the other at reasonable
     times and shall promptly give notice of observed defects. Each party
     authorizes the other to rely in connection with design and construction
     upon approval and other actions on the party's behalf by any Construction
     Representative of the party named above or any person hereafter designated
     in substitution or addition by notice to the party relying. Tenant
     acknowledges that Tenant is acting for its own benefit and account and that
     Tenant will not be acting as Landlord's agent in performing any Tenant
     Work, accordingly, no contractor, subcontractor or supplier shall have a
     right to lien Landlord's interest in the Property in connection with any
     work.

7.4  Special Allowance

     (A) Landlord shall provide to Tenant a special allowance equal to the
     product of (i) $13.00 and (ii) the Rentable Floor Area of the Third
     Expansion Premises A (the "Third

<PAGE>

     Expansion Premises A Tenant Allowance"). The Third Expansion Premises A
     Tenant Allowance shall be used and applied by Tenant solely on account of
     the cost of associated architect's fees, construction supervision and
     construction of Tenant's Work, provided, however, Tenant may use and apply
     a portion of the Third Expansion Premises A Tenant Allowance on account of
     Tenant's so-called "soft costs" related to the Third Expansion Premises A
     Work (including, supervisory and construction management fees, and the cost
     of wiring and cabling), in an amount not to exceed the product of (x) $1.00
     and (y) the Rentable Floor area of the Third Expansion Premises A. Provided
     that the Tenant (i) has completed all of such Third Expansion Premises A
     Work in accordance with the terms of the Lease, has paid for all of such
     Third Expansion Premises A Work in full and has delivered to Landlord lien
     waivers as required by Section 7.3 herein, (ii) has executed the
     Commencement Date Agreement in the form annexed hereto as Exhibit C, (iii)
     has delivered to Landlord its certificate specifying the cost of such Third
     Expansion Premises A Work and all contractors, subcontractors and supplies
     involved with the Third Expansion Premises A Work, together with evidence
     of such cost in the form of paid invoices, receipts and the like, (iv) has
     satisfied the requirements of (i) through (iii) above and made request for
     such payment on or before the date that is three hundred and sixty five
     (365) days after the Third Expansion Premises A Commencement Date, (v) is
     not otherwise in default (beyond applicable notice and cure periods) under
     the Lease, and (vi) there are no liens (unless bonded to the reasonable
     satisfaction of Landlord) against Tenant's interest in the Lease or against
     the Building or the Site arising out of the Third Expansion Premises A Work
     or any litigation in which Tenant is a party, then within thirty (30) days
     after the satisfaction of the foregoing conditions, the Landlord shall pay
     to the Tenant the lesser of the amount of such costs so certified (the
     "Third Expansion Premises A Certified Costs") or the amount of the Third
     Expansion Premises A Tenant Allowance. For the purposes hereof, the cost to
     be so reimbursed by Landlord shall include the cost of leasehold
     improvements but not the cost of any of Tenant's personal property, trade
     fixtures or trade equipment or any so-called soft costs, except as
     expressly permitted above. Notwithstanding the foregoing, Landlord shall be
     under no obligation to apply any portion of the Third Expansion Premises A
     Tenant Allowance for any purposes other than as provided in this Section
     7.4, nor shall Landlord be deemed to have assumed any obligations, in whole
     or in part, of Tenant to any contractors, subcontractors, suppliers,
     workers or materialmen. Further, except as provided in this Section 7.4,
     the Third Expansion Premises A Tenant Allowance shall only be applied
     towards the cost of leasehold improvements and in no event shall Landlord
     be required to make application of any portion of the Third Expansion
     Premises A Tenant Allowance towards Tenant's personal property, trade
     fixtures or moving expenses or on account of any supervisory fees,
     overhead, management fees or other payments to Tenant, or any partner or
     affiliate of Tenant. In the event that such cost of the Third Expansion
     Premises A Work and the other costs for which Tenant is permitted to seek
     reimbursement above are less than the Third Expansion Premises A Tenant
     Allowance, Tenant shall not be entitled to any payment or credit nor shall
     there be any application of the same toward Annual Fixed Rent or Additional
     Rent owed by Tenant under the Lease, provided, however, notwithstanding the
     foregoing, that the amount of the Third Expansion Premises A Tenant
     Allowance in excess of the Third Expansion Premises A Certified Costs (the
     "Third Expansion Premises A Allowance Excess"), if

<PAGE>

     any, shall be added to, and made available to Tenant as part of the Third
     Expansion Premises B Tenant Allowance (as defined below). Landlord shall be
     entitled to deduct from the Third Expansion Premises A Tenant Allowance an
     amount equal to the sum of (i) third party expenses incurred by Landlord to
     review any elements of the Third Expansion Premises A Plans and the Third
     Expansion Premises A Work that may affect the structure of the Building,
     and (ii) third party expenses incurred by Landlord review the Third
     Expansion Premises A Plans and the Third Expansion Premises A Work of which
     Tenant has received advance notice and which Tenant, in its commercially
     reasonable determination, has approved.

     (B) Landlord shall provide to Tenant a special allowance equal to the
     product of (i) $13.00 and (ii) the Rentable Floor Area of the Third
     Expansion Premises B (the "Third Expansion Premises B Tenant Allowance").
     The Third Expansion Premises B Tenant Allowance shall be used and applied
     by Tenant solely on account of the cost of associated architect's fees,
     construction supervision and construction of Tenant's Work, provided,
     however, Tenant may use and apply a portion of the Third Expansion Premises
     B Tenant Allowance on account of Tenant's so-called "soft costs" related to
     the Third Expansion Premises B Work (including, supervisory and
     construction management fees, and the cost of wiring and cabling), in an
     amount not to exceed the product of (x) $1.00 and (y) the Rentable Floor
     Area of the Third Expansion Premises B. Provided that the Tenant (i) has
     completed all of such Third Expansion Premises B Work in accordance with
     the terms of the Lease, has paid for all of such Third Expansion Premises B
     Work in full and has delivered to Landlord lien waivers as required by
     Section 7.3 herein, (ii) has executed the Commencement Date Agreement in
     the form annexed hereto as Exhibit C, (iii) has delivered to Landlord its
     certificate specifying the cost of such Third Expansion Premises B Work and
     all contractors, subcontractors and supplies involved with the Third
     Expansion Premises B Work, together with evidence of such cost in the form
     of paid invoices, receipts and the like, (iv) has satisfied the
     requirements of (i) through (iii) above and made request for such payment
     on or before the date that is three hundred and sixty five (365) days after
     the Third Expansion Premises B Commencement Date, (v) is not otherwise in
     default (beyond applicable notice and cure periods) under the Lease, and
     (vi) there are no liens (unless bonded to the reasonable satisfaction of
     Landlord) against Tenant's interest in the Lease or against the Building or
     the Site arising out of the Third Expansion Premises B Work or any
     litigation in which Tenant is a party, then within thirty (30) days after
     the satisfaction of the foregoing conditions, the Landlord shall pay to the
     Tenant the lesser of the amount of such costs so certified (the "Third
     Expansion Premises B Certified Costs") or the amount of the Third Expansion
     Premises B Tenant Allowance. For the purposes hereof, the cost to be so
     reimbursed by Landlord shall include the cost of leasehold improvements but
     not the cost of any of Tenant's personal property, trade fixtures or trade
     equipment or any so-called soft costs, except as expressly permitted above.
     Notwithstanding the foregoing, Landlord shall be under no obligation to
     apply any portion of the Third Expansion Premises B Tenant Allowance for
     any purposes other than as provided in this Section 7.4, nor shall Landlord
     be deemed to have assumed any obligations, in whole or in part, of Tenant
     to any contractors, subcontractors, suppliers, workers or materialmen.
     Further, except as provided in this Section 7.4, the Third Expansion
     Premises B Tenant Allowance shall only be applied towards the cost of
     leasehold improvements and in no event shall Landlord be required to

<PAGE>

     make application of any portion of the Third Expansion Premises B Tenant
     Allowance towards Tenant's personal property, trade fixtures or moving
     expenses or on account of any supervisory fees, overhead, management fees
     or other payments to Tenant, or any partner or affiliate of Tenant. In the
     event that such cost of the Third Expansion Premises B Work and the other
     costs for which Tenant is permitted to seek reimbursement above are less
     than the Third Expansion Premises B Tenant Allowance, Tenant shall not be
     entitled to any payment or credit nor shall there be any application of the
     same toward Annual Fixed Rent or Additional Rent owned by Tenant under the
     Lease, provided, however, notwithstanding the foregoing, that the amount of
     the Third Expansion Premises B Tenant Allowance in excess of the Third
     Expansion Premises B Certified Costs (the "Third Expansion Premises B
     Allowance Excess"), if any, shall be added to, and made available to Tenant
     as part of the Third Expansion Premises A Tenant Allowance. Landlord shall
     be entitled to deduct from the Third Expansion Premises B Tenant Allowance
     an amount equal to the sum of (i) third party expenses incurred by
     Landlord to review any elements of the Third Expansion Premises B Plans and
     the Third Expansion Premises B Work that may affect the structure of the
     Building, and (ii) third party expenses incurred by Landlord to review the
     Third Expansion Premises B Plans and the Third Expansion Premises B Work of
     which Tenant has received advance notice and which Tenant, in its
     commercially reasonable determination, has approved.

7.5  Early Access by Tenant.

     (A) On or after April 1, 2007, and subject to the timely surrender of the
     Third Expansion Premises A by the existing tenants of the Third Expansion
     Premises A, Landlord shall permit Tenant access to the Third Expansion
     Premises A to commence the construction of the Third Expansion Premises A
     Work. Landlord shall use commercially reasonable efforts to provide Tenant
     with at least four (4) days advanced notice (which notice may be oral to
     Tenant's Construction Representative) of the anticipated date on which
     Landlord will provide Tenant with such access, provided, however, the
     parties agree that Tenant shall have no remedy or recourse for Landlord's
     failure to provide such advanced notice and, provided further, that in no
     event will Landlord's failure to provide such advanced notice delay the
     Third Expansion Premises A Commencement Date or the Third Expansion
     Premises A Rent Commencement Date. Any such access by Tenant shall be upon
     all of the terms and conditions of the Lease (other than the payment of
     Annual Fixed Rent) and shall be at Tenant's sole risk, and Landlord shall
     not be responsible for any injury to persons or damage to property
     resulting from such early access by Tenant.

     If the existing tenants of the Third Expansion Premises A wrongfully fail
     to deliver possession of such space at the time when their tenancy is
     scheduled to expire, Landlord shall use reasonable efforts and due
     diligence (which shall be limited to the commencement and prosecution
     thereafter of eviction proceedings but which shall not require the taking
     of any appeal) to evict such occupant from such space and to deliver
     possession of such space to Tenant as soon as may be practicable. The
     failure of the then occupant of such space to so vacate shall not give
     Tenant any right to terminate this Amendment or to deduct from, offset
     against or withhold Annual Fixed Rent, Additional Rent or other charges due
     under this Amendment (or any portions thereof), except as

<PAGE>
     expressly provided in the next sentence of this Section. If Landlord shall
     have failed to provide Tenant with such access to the Third Expansion
     Premises A on or before September 1, 2007 (the "Outside Delivery Date")
     (which date shall be extended automatically for such periods of time as
     Landlord is prevented from providing the same by reason of Force Majeure
     (it being agreed said Force Majeure shall not include delay attributable to
     any existing tenant's wrongful failure to deliver possession of the Third
     Expansion Premises A, as more particularly described above) or any act or
     failure to act of Tenant which interferes with Landlord's ability to
     provide such access, without limiting Landlord's other rights on account
     thereof), Tenant shall have the right to terminate this Third Amendment to
     Lease, with respect to the Third Expansion Premises A only, by giving
     notice to Landlord of Tenant's desire do so before such access is provided
     to Tenant within the time period from the Outside Delivery Date (as so
     extended) until the date which is thirty (30) days subsequent to the
     Outside Delivery Date (as so extended); and, upon the giving of such
     notice, the term of this Third Amendment to Lease, shall cease and come to
     an end with respect to the Third Expansion Premises A only, without further
     liability or obligation on the part of either party unless, within thirty
     (30) days after receipt of such notice, Landlord provides such access to
     Tenant; and such right of termination shall be Tenant's sole and exclusive
     remedy for Landlord's failure to provide access within such time.

     (B) As of the date of this Third Amendment, Landlord shall permit Tenant
     access to the Third Expansion Premises B to commence the construction of
     the Third Expansion Premises B Work. Any such access by Tenant shall be
     upon all of the terms and conditions of the Lease (other than the payment
     of Annual Fixed Rent) and shall be at Tenant's sole risk, and Landlord
     shall not be responsible for any injury to persons or damage to property
     resulting from such early access by Tenant.

8.   Section 11 of the Second Amendment is deleted and neither party shall have
     any further right or obligation thereunder.

9.   Effective as of the Third Expansion Premises A Commencement Date and
     continuing through the expiration of the Term, clause (iii) of the last
     sentence of Section 5.6.1.1 of the Lease is hereby deleted and the
     following language is substituted therefor: "(iii) in no event shall there
     exist more than five (5) partial subleases at any one time during the
     Term," and a new clause (iv) shall be added as follows: "and (iv) in no
     event shall the rentable floor area of any subleased premises be less than
     3,000 square feet."

10.  DELIVERY OF ADDITIONAL SECURITY DEPOSIT.

     (a) As of the date of this Third Amendment, Tenant agrees to pay to
     Landlord $91,375.00 (the "Additional Security Deposit"). Such Additional
     Security Deposit, along with the existing security deposit in the amount of
     $216,300.00 (the "Existing Security Deposit") paid by Tenant in accordance
     with Section 8.21 of the Lease, shall be held by Landlord as security for
     the performance by Tenant of all obligations on the part of Tenant under
     the Lease during the Term (as may be further extended) with respect to the
     Premises, as such term is amended by this Third Amendment, pursuant to the
     terms and conditions set forth in Section 8.21. The Additional Security
     Deposit and the Existing Security Deposit are hereafter collectively
     referred to as the "Security Deposit."

<PAGE>

     Landlord shall continue to hold the Security Deposit in accordance with the
     terms and conditions of the Lease, except as follows.

     (b) With respect to the Additional Security Deposit only, Landlord shall
     exchange the then existing Letter of Credit for a Letter of Credit
     delivered by Tenant which reduces the amount secured by said Letter of
     Credit by Twenty Six Thousand and Thirty Three 00/100 Dollars ($26,033.00)
     (and otherwise in strict conformity with the requirements of Section 8.21
     of the Lease) on the date that is twelve months prior to the Third
     Expansion Premises Expiration Date (i.e., September 30, 2009) so that the
     remainder of the Additional Security Deposit thereafter secured by the
     Letter of Credit shall be Sixty Five Thousand Three Hundred and Forty Two
     00/100 Dollars ($65,342.00) and the remainder of the Total Security Deposit
     thereafter secured by the Letter of Credit shall be Two Hundred Eighty One
     Thousand Six Hundred and Forty Two 00/100 Dollars ($281,642.00), if (i)
     Tenant is not then in default (beyond applicable notice and cure periods)
     under the terms of the Lease, (ii) Landlord has not applied such deposit or
     any portion thereof to Landlord's damages arising from any default on the
     part of Tenant, whether or not Tenant has restored the amount so applied by
     Landlord and (iii) there have been no more than two (2) Event of Default
     occurrences during the Term.

     (c) If Tenant believes that it has satisfied all the conditions precedent
     to a reduction in the amount of the Additional Security Deposit, then it
     shall request such reduction in writing to Landlord, which request shall
     certify to Landlord that all such conditions have been satisfied. If
     Landlord determines that all of the aforesaid conditions are met, the
     Additional Security Deposit shall be so reduced in accordance with this
     Section. No Letter of Credit shall automatically reduce, but any reduction
     in the amount thereof shall require Landlord's prior written notice to the
     issuer of the Letter of Credit of the reduced amount. Within thirty (30)
     days after Landlord's receipt of Tenant's request for a reduction as
     described above, Landlord shall determine whether such a reduction is
     permitted in accordance with this Section, and if it is, Landlord shall
     notify the issuer of the Letter of Credit of the amount to which the Letter
     of Credit shall be reduced.

11.  (A) Tenant warrants and represents that Tenant has not dealt with any
     broker in connection with the consummation of this Third Amendment other
     than the Broker referenced above; and in the event any claim is made
     against Landlord relative to dealings by Tenant with brokers other than the
     Broker, Tenant shall defend the claim against Landlord with counsel of
     Tenant's selection first approved by Landlord (which approval will not be
     unreasonably withheld) and save harmless and indemnify Landlord on account
     of loss, cost or damage which may arise by reason of such claim.

     (B) Landlord warrants and represents that Landlord has not dealt with any
     broker in connection with the consummation of this Third Amendment other
     than the Broker referenced above; and in the event any claim is made
     against Tenant relative to dealings by Landlord with brokers other than the
     Broker, Landlord shall defend the claim against Tenant with counsel of
     Landlord's selection and save harmless and indemnify Tenant on account of
     loss, cost or damage which may arise by reason of such claim. Landlord
     agrees that it shall be solely responsible for the payment of brokerage
     commissions due to the Broker referenced above in accordance with a
     separate commission agreement.

<PAGE>

12.  Except as otherwise expressly provided herein, all capitalized terms used
     herein without definition shall have the same meanings as are set forth in
     the Lease.

13.  Except as herein amended the Lease shall remain unchanged and in full force
     and effect. All references to the "Lease" shall be deemed to be references
     to the Lease as herein amended.

                           [Signature page to follow.]

<PAGE>

     EXECUTED as a sealed instrument as of the date and year first above
written.

WITNESS:                                LANDLORD:

                                        BOSTON PROPERTIES LIMITED PARTNERSHIP

                                        By BOSTON PROPERTIES, INC.,
                                        Its general partner

/s/ [illegible]                         By /s/ David C. Provost
-------------------------------------      -------------------------------------
                                        Name David C. Provost
                                        Title Senior Vice President
                                              Boston Properties

ATTEST:                                 TENANT:

                                        CONSTANT CONTACT, INC.

By: /s/ Eric Groves                     By /s/ Gail Goodman
    ---------------------------------      -------------------------------------
Name: Eric Groves                       Name Gail Goodman
Title: SECRETARY or                     Title PRESIDENT or (VICE PRESIDENT)
       (ASSISTANT SECRETARY)                   HEREUNTO DULY AUTHORIZED

                                        By /s/ Steven R. Wasserman
                                           -------------------------------------
                                        Name Steven R. Wasserman
                                        Title TREASURER or
                                              (ASSISTANT TREASURER)
                                              HEREUNTO DULY AUTHORIZED

                                        (CORPORATE SEAL)

<PAGE>

                                    EXHIBIT A

                        Plan of Third Expansion Premises

<PAGE>

                                    EXHIBIT B

                  TENANT PLAN AND WORKING DRAWING REQUIREMENTS

1.   Floor plan indicating location of partitions and doors (details required of
     partition and door types).

2.   Location of standard electrical convenience outlets and telephone outlets.

3.   Location ;and details of special electrical outlets; (e.g. Xerox),
     including voltage, amperage, phase and NEMA configuration of outlets.

4.   Reflected ceiling plan showing layout of standard ceiling and lighting
     fixtures. Partitions to be shown lightly with switches located indicating
     fixtures to be controlled.

5.   Locations and details of special ceiling conditions, lighting fixtures,
     speakers, etc.

6.   Location and heat load in BTU/Hr. of all special air conditioning and
     ventilating requirements and all necessary HVAC mechanical drawings.

7.   Location and details of special structural requirements, e.g., slab
     penetrations and areas with floor loadings exceeding a live load of 70
     lbs./s.f.

8.   Locations and details of all plumbing fixtures; sinks, drinking fountains,
     etc.

9.   Location and specifications of floor coverings, e.g., vinyl tile, carpet,
     ceramic tile, etc.

10.  Finish schedule plan indicating wall covering, paint or paneling with paint
     colors referenced to standard color system.

11.  Details and specifications of special millwork, glass partitions, rolling
     doors and grilles, blackboards, shelves, etc.

12.  Hardware schedule indicating door number keyed to plan, size, hardware
     required including butts, latchsets or locksets, closures, stops, and any
     special items such as thresholds, soundproofing, etc. Keying schedule is
     required.

13.  Verified dimensions of all built-in equipment (file cabinets, lockers, plan
     files, etc.).

14.  Location of any special soundproofing requirements.

15.  All drawings to be uniform size (30" X 42") and shall incorporate the
     standard project electrical and plumbing symbols and be at a scale of 1/8"
     = 1' or larger.

16.  Drawing submittal shall include the appropriate quantity required for
     Landlord to file for permit along with four half size sets and one full
     size set for Landlord's review and use.

17.  Provide all other information necessary to obtain all permits and approvals
     for Landlord's Work.

<PAGE>

18.  Upon completion of the work, Tenant shall provide Landlord with two hard
     copies and one electronic CAD file of updated architectural and mechanical
     drawings to reflect all project sketches and changes.
<PAGE>

                                    EXHIBIT C

                       FORM OF COMMENCEMENT DATE AGREEMENT

             DECLARATION AFFIXING THE COMMENCEMENT DATE OF AMENDMENT

THIS AGREEMENT made this __ day of ______________ 200_, by and between
___________________________ (hereinafter "Landlord") and ______________
(hereinafter "Tenant").

                                WITNESSETH THAT:

1.   This Agreement is made pursuant to Section _ of that certain Lease
     Amendment dated _________________, between the parties aforenamed as
     Landlord and Tenant (the "Lease").

2.   It is hereby stipulated that the applicable Lease Term commenced on
     ____________, (being the relevant "Commencement Date" under the Amendment),
     and shall end and expire on ____________________, unless sooner terminated
     or extended, as provided for in the Lease.

WITNESS the execution hereof under seal by persons hereunto duly authorized, the
date first above written.

                                        LANDLORD:

                                        ----------------------------------------

                                        TENANT:

                                        ----------------------------------------

ATTEST:

By:                                     By:
    ---------------------------------       ------------------------------------
Name:                                   Name:
      -------------------------------         ----------------------------------
Title:                                  Title:
       ------------------------------          ---------------------------------
                                                Hereunto duly authorized

                                                                (CORPORATE SEAL)

<PAGE>

                          COMMONWEALTH OF MASSACHUSETTS

COUNTY OF SUFFOLK

On this __ day of _______________, 200_, before me, the undersigned notary
public, personally appeared ________________, proved to me through satisfactory
evidence of identification, which were _________________________, to be the
person whose name is signed on the preceding or attached document in my
presence.

-------------------------------------
NOTARY PUBLIC
My Commission Expires:

                          COMMONWEALTH OF MASSACHUSETTS

COUNTY OF ___________________

On this __ day of _______________, 200_, before me, the undersigned notary
public, personally appeared ________________, proved to me through satisfactory
evidence of identification, which were _________________________, to be the
person whose name is signed on the preceding or attached document, and who swore
or affirmed to me that the contents of the documents are truthful and accurate
to the best of [his] [her] knowledge and belief.

-------------------------------------
NOTARY PUBLIC
My Commission Expires:

<PAGE>

                                    EXHIBIT D

                              FORMS OF LIEN WAIVERS

              CONTRACTOR'S PARTIAL WAIVER AND SUBORDINATION OF LIEN

STATE OF ____________________________                    Date: _________________

______________________________ COUNTY       Application for Payment No.: _______

OWNER: _________________________________________________________________________

CONTRACTOR: ____________________________________________________________________

LENDER / MORTGAGEE:                     None

1.   Original Contract Amount:          $ ______________________________________

2.   Approved Change Orders:            $ ______________________________________

3.   Adjusted Contract Amount:          $ ______________________________________
     (line 1 plus line 2)

4.   Completed to Date:                 $ ______________________________________

5.   Less Retainage:                    $ ______________________________________

6.   Total Payable to Date:             $ ______________________________________
     (line 4 less line 5)

7.   Less Previous Payments:            $ ______________________________________

8.   Current Amount Due:                $ ______________________________________
     (line 6 less line 7)

9.   Pending Change Orders:             $ ______________________________________

10.  Disputed Claims:                   $ ______________________________________

The undersigned who has a contract with _________________________________ for
furnishing labor or materials or both labor and materials or rental equipment,
appliances or tools for the erection, alteration, repair or removal of a
building or structure or other improvement of real property known and identified
as located in ___________________ (city or town), _________ County,
____________________________ and owned by _______________________, upon receipt
of ____________________ ($__________________) in payment of an
invoice/requisition/application for payment dated ___________________ does
hereby:

<PAGE>

     (a)  waive any and all liens and right of lien on such real property for
          labor or materials, or both labor and materials, or rental equipment,
          appliances or tools, performed or furnished through the following date
          _____________________ (payment period), except for retainage, unpaid
          agreed or pending change orders, and disputed claims as stated above;

     (b)  subordinate any and all liens and right of lien to secure payment for
          such unpaid, agreed or pending change orders and disputed claims, and
          such further labor or materials, or both labor and materials, or
          rental equipment, appliances or tools, except for retainage, performed
          or furnished at any time through the twenty-fifth day after the end of
          the above payment period, to the extent of the amount actually
          advanced by the above lender/mortgagee through such twenty-fifth day.

     Signed under the penalties of perjury this __________ day of _____________,
20__.

WITNESS:                                CONTRACTOR:

-------------------------------------   ----------------------------------------
Name:                                   Name:
      -------------------------------         ----------------------------------
Title:                                  Title:
       ------------------------------          ---------------------------------

<PAGE>

                           SUBCONTRACTOR'S LIEN WAIVER

General Contractor: ____________________________________________________________

Subcontractor: _________________________________________________________________

Owner: _________________________________________________________________________

Project: _______________________________________________________________________

Total Amount Previously Paid:                    $ _____________________________

Amount Paid This Date:                           $ _____________________________

Retainage (Including This Payment) Held to Date: $ _____________________________

In consideration of the receipt of the amount of payment set forth above and any
and all past payments received from the Contractor in connection with the
Project, the undersigned acknowledges and agrees that it has been paid all sums
due for all labor, materials and/or equipment furnished by the undersigned to or
in connection with the Project and the undersigned hereby releases, discharges,
relinquishes and waives any and all claims, suits, liens and rights under any
Notice of Identification, Notice of Contract or statement of account with
respect to the Owner, the Project and/or against the Contractor on account of
any labor, materials and/or equipment furnished through the date hereof.

The undersigned individual represents and warrants that he is the duly
authorized representative of the undersigned, empowered and authorized to
execute and deliver this document on behalf of the undersigned and that this
document binds the undersigned to the extent that the payment referred to herein
is received.

The undersigned represents and warrants that it has paid in full each and every
sub-subcontractor, laborer and labor and/or material supplier with whom
undersigned has dealt in connection with the Project and the undersigned agrees
at its sole cost and expense to defend, indemnify and hold harmless the
Contractor against any claims, demands, suits, disputes, damages, costs,
expenses (including attorneys fees), liens and/or claims of lien made by such
sub-subcontractors, laborers and labor and/or material suppliers arising out of
or in any way related to the Project. This document is to take effect as a
sealed instrument.

<PAGE>

Signed under the penalties of perjury as of this _____ day of
__________________, 20__.

SUBCONTRACTOR:                          Signature and Printed Name of Individual
                                        Signing this Lien Waiver

-------------------------------------   ----------------------------------------

                                        ----------------------------------------

WITNESS:

-------------------------------------

Name:
      -------------------------------
Title:
       ------------------------------
Dated:
       ------------------------------

<PAGE>

 CONTRACTOR'S WAIVER OF CLAIMS AGAINST OWNER AND ACKNOWLEDGMENT OF FINAL PAYMENT

Commonwealth of Massachusetts                       Date: ______________________

COUNTY OF ___________________________         Invoice No.: _____________________

OWNER: _________________________________________________________________________

CONTRACTOR: ____________________________________________________________________

PROJECT: _______________________________________________________________________

1.   Original Contract Amount:                $ ________________________________

2.   Approved Change Orders:                  $ ________________________________

3.   Adjusted Contract Amount:                $ ________________________________

4.   Sums Paid On Account of Contract Amount: $ ________________________________

5.   Less Final Payment Due:                  $ ________________________________

The undersigned being duly sworn hereby attests that when the Final Payment Due
as set forth above is paid in full by Owner, such payment shall constitute
payment in full for all labor, materials, equipment and work in place furnished
by the undersigned in connection with the aforesaid contract and that no further
payment is or will be due to the undersigned.

The undersigned hereby attests that it has satisfied all claims against it for
items, including by way of illustration but not by way of limitation, items of:
labor, materials, insurance, taxes, union benefits, equipment, etc. employed in
the prosecution of the work of said contract, and acknowledges that satisfaction
of such claims serves as an inducement for the Owner to release the Final
Payment Due.

The undersigned hereby agrees to indemnify and hold harmless the Owner from and
against all claims arising in connection with its Contract with respect to
claims for the furnishing of labor, materials and equipment by others. Said
indemnification and hold harmless shall include the reimbursement of all actual
attorney's fees and all costs and expenses of every nature, and shall be to the
fullest extent permitted by law.

The undersigned hereby irrevocably waives and releases any and all liens and
right of lien on such real property and other property of the Owner for labor or
materials, or both labor and materials, or rental equipment, appliances or
tools, performed or furnished by the undersigned, and anyone claiming by,
through, or under the undersigned, in connection with the Project.

<PAGE>

The undersigned hereby releases, remises and discharges the Owner, any agent of
the Owner and their respective predecessors, successors, assigns, employees,
officers, shareholders, directors, and principals, whether disclosed or
undisclosed (collectively "Releasees") from and against any and all claims,
losses, damages, actions and causes of action (collectively "Claims") which the
undersigned and anyone claiming by, through or under the undersigned has or may
have against the Releasees, including, without limitation, any claims arising in
connection with the Contract and the work performed thereunder.

Notwithstanding anything to the contrary herein, payment to the undersigned of
the Final Payment Due sum as set forth above, shall not constitute a waiver by
the Owner of any of its rights under the contract including by way of
illustration but not by way of limitation guarantees and/or warranties. Payment
will not be made until a signed waiver is returned to Owner.

The undersigned individual represents and warrants that he/she is the duly
authorized representative of the undersigned, empowered and authorized to
execute and deliver this document on behalf of the undersigned.

<PAGE>

Signed under the penalties of perjury as a sealed instrument as of this __ day
of ___________________, _______.

_________________________ Corporation

By:
    ---------------------------------
Name:
      -------------------------------
Title:
       ------------------------------
       Hereunto duly authorized

                          COMMONWEALTH OF MASSACHUSETTS

COUNTY OF SUFFOLK

     On this __ day of ___________________, 20__, before me, the undersigned
notary public, personally appeared ________________________, proved to me
through satisfactory evidence of identification, to be the person whose name is
signed on the preceding or attached document, and acknowledged to me that he/she
signed it as _____________________ for __________________________, a
corporation/partnership voluntarily for its stated purpose.

-------------------------------------
NOTARY PUBLIC
My Commission Expires:

<PAGE>

                                    EXHIBIT E

                            TENANT'S SCHEMATIC PLANS
                                 (see attached)

                      [IMAGE OF TENANT'S SCHEMATIC PLANS]

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