Document:

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                                                                    Exhibit 10.1

                              EMPLOYMENT AGREEMENT

      THIS AGREEMENT (this "Agreement"), dated as of February 25, 2004, is made
by and between Biopure Corporation, a Delaware corporation, having its principal
place of business at 11 Hurley Street, Cambridge, MA 02141 (the "Company"), and
Mr. Francis H. Murphy, residing at 42 Eighth Street # 3526, Charlestown,
Massachusetts 02129 (the "Executive").

                                    Recitals

      1. The Company wishes to employ the Executive as the Interim President and
Chief Executive Officer of the Company.

      2. The Company has determined that it is essential to enter into an
employment agreement providing for the compensation and benefits set forth below
in order to induce the Executive to be so employed.

      3. The Executive agrees to accept such employment by the Company on the
terms set forth in this Agreement.

                                    Agreement

      NOW, THEREFORE, in consideration of the mutual covenants and premises
contained in this Agreement, and other good and valuable consideration, the
Company and the Executive hereby agree as follows.

      1. CERTAIN DEFINITIONS.

            1.1 "Effective Date" shall mean the date of this Agreement.

            1.2 "Employment Period" shall mean the period commencing on the
Effective Date and continuing until such time as a new President and Chief
Executive Officer, appointed by the Company's Board of Directors, begins to
perform his or her employment.

            1.3 "Transition Period" shall mean the six-month period following
the expiration of the Employment Period.

            1.4 "Board" shall mean the Board of Directors of the Company.

      2. EMPLOYMENT.

            2.1 During Employment Period. Subject to the terms and conditions
provided in this Agreement, the Company hereby agrees, during the Employment
Period, to employ the Executive as its Interim President and Chief Executive
Officer. The Executive hereby agrees to accept such employment during the
Employment Period.

            2.2 During the Transition Period. Subject to the terms and
conditions provided in this Agreement, the Company agrees, from the day
following the end of the Employment Period and
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for the duration of the Transition Period, to return the Executive to the
position he held immediately prior to the Employment Period or to another
position to be mutually agreed upon by the Executive and the Company. At the end
of the Transition Period, the Executive's employment with the Company will
revert to at-will employment.

      3. EMPLOYMENT DUTIES. During the Employment Period, the Executive shall
have such duties and responsibilities as are assigned to the Executive by the
Board and are consistent with his status as Interim President and Chief
Executive Officer and shall take direction from and report to the Board. During
the Employment Period, the Executive agrees to devote substantially all of his
business attention and time to the business and affairs of the Company and its
subsidiaries, and to use the Executive's best efforts to perform faithfully and
efficiently the duties and responsibilities assigned to the Executive under this
Section 3.

      4. COMPENSATION.

            4.1 Base Salary. During the Employment Period, the Company shall pay
the Executive a base salary (the "Base Salary") of no less than $262,522 per
annum, payable in accordance with the Company's normal payroll practices for
senior executives. The Base Salary shall be reviewed at least once each year,
should the Employment Period extend beyond one year, in accordance with the
Company's regular review of senior executive salaries, and shall not be
decreased without the Executive's consent.

            4.2 Transition Salary. From the day following the end of the
Employment Period and for the duration of the Transition Period, the Company
shall pay the Executive a transition salary ("Transition Salary") of no less
than $200,590 on an annualized basis, payable in accordance with the Company's
normal payroll practices for senior executives.

            4.3 Incentive, Savings and Retirement Plans. During the Employment
Period and Transition Period, the Executive shall be eligible to participate in
all bonus, short- or long-term incentive plans and programs established by the
Board from time to time and in existence on or after the Effective Date for the
benefit of senior executives of the Company. If the Board adopts any such plan
during the Employment Period or Transition Period, it is understood that bonus
targets under said plan will be in the range of 50% of base salary of the
Executive or in accordance with industry standards. During the Employment Period
and Transition Period, the Executive shall be eligible to participate in all
savings and retirement plans and programs as the plan terms allow maintained by
the Company from time to time on or after the Effective Date for the benefit of
senior executives of the Company. The Executive will be eligible to participate
in periodic awards in accordance with the terms of the Company's 2002 Omnibus
Securities and Incentive Plan or any other such plan in which senior executives
may become eligible to participate from time to time in the Company's
discretion. In considering granting to the Executive options or other
compensation in the form of or measured by the Company's securities, the Board
will consider, among other factors, sales of securities since the date of the
Executive's last award.

            4.4 Welfare Benefit Plans. During the Employment Period and
Transition Period, the Executive and/or the Executive's family shall be eligible
to participate in all welfare benefit plans and programs, as plan or program
terms allow, maintained by the Company from

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time to time on or after the Effective Date for the benefit of senior executives
or employees of the Company.

            4.5 Vacation; Fringe Benefits. During the Employment Period, the
Executive shall be entitled to five (5) weeks of vacation annually, and any
accrued and unused vacation shall be carried over to the next year without any
reduction; provided, however, that the maximum carryover on a year-to-year basis
shall be five (5) weeks. During the Transition Period, the Executive shall be
entitled to five (5) weeks of vacation annually on a pro rata basis and shall be
accrued in accordance with Company policy. During the Employment Period and the
Transition Period, the Executive shall receive such perquisites and fringe
benefits as are generally provided to senior executives of the Company. The
Executive shall be reimbursed for reasonable business expenses in accordance
with Company policy.

            4.6 Vesting and Exercise of Stock Options. Pursuant to Article IV,
Section 4.3 of the 2002 Omnibus Securities and Incentive Plan (attached hereto
at Exhibit A), the Committee, as defined therein, has amended the terms and
restrictions provisions of the Stock Option Awards made to the Executive
throughout his employment as follows: upon termination of the Executive's
employment by reason of his retirement, all Stock Options issued to the
Executive shall immediately vest. Said vested Stock Options shall remain
exercisable pursuant to Article VI, Section 6.2(b)(2) of the 2002 Omnibus
Securities and Incentive Plan.

            4.7 Power of Board Unimpaired. Nothing in this Section 4 shall
impair the ability of the Board in its discretion to amend or eliminate any plan
or policy described or referred to in this Section 4, provided, however, that
any such amendment or elimination shall not adversely affect, impair or impact
any outstanding stock-based award held by the Executive as of the date of such
amendment or elimination.

      5. TERMINATION.

            5.1 Death or Disability. The Employment Period or Transition Period
shall terminate automatically upon the Executive's death. If, during the
Employment Period or the Transition Period, the Disability (as defined below) of
the Executive has occurred, the Company may give to the Executive written notice
of its intention to terminate the Executive's employment due to such Disability.
The Executive's employment with the Company shall be terminated by the Company
on the 30th day after receipt by the Executive of such notice (the "Disability
Effective Date"), if, within such thirty (30) day period, the Executive shall
not have returned to full-time performance of the Executive's duties. For
purposes of this Agreement, "Disability" means a physical or mental disability
resulting in the inability of the Executive to perform his duties full-time
under this Agreement, as set forth in Section 3, during any consecutive
six-month period, as determined by a physician selected in good faith by the
Company and approved in good faith by the Executive or his legal representative.
If the Company and the Executive cannot agree as to the selection of a licensed
physician for the purposes of making such determination, then each party shall
select a licensed physician and these two licensed physicians shall select a
third licensed physician who shall make such determination. Nothing in this
Section 5.1 is intended to be inconsistent with applicable federal or state law
regarding disabilities, if any.

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            5.2 Cause.

                  (a) The Board may terminate the employment of the Executive
for Cause by written notice to the Executive. Upon receipt of such written
notice, the Executive shall have the right to seek (within ten (10) business
days) an opportunity to be heard by the Board, which opportunity the Board shall
arrange as promptly and in such format as directors' schedules permit. For
purposes of this Agreement, Cause shall mean: (a) an act or acts of material
personal dishonesty taken by, or committed at the request of, the Executive,
intended to result in the personal enrichment of the Executive at the expense of
the Company, or any of its Affiliates; (b) repeat willful violations by the
Executive of the material terms of this Agreement, which have not been cured
within thirty (30) days after written notice has been given by the Board to the
Executive; or (c) the conviction of the Executive of a felony.

                  (b) In the event the Board wishes to terminate the Executive
for breach of this Agreement during the Employment Period or the Transition
Period pursuant to Section 5.2(a), and such breach is capable of being cured,
the Board shall provide the Executive with written notice specifying in
reasonable detail the services or matters which it contends the Executive has
not adequately performed, or the material provisions of this Agreement of which
the Executive is in violation and the acts constituting such violation, why the
Company has Cause to terminate this Agreement and what the Executive should do
to adequately perform his obligations hereunder along with a copy of a
resolution, duly adopted by the Board at a meeting called and held for the
purpose (after reasonable notice to Executive and an opportunity for him to be
heard before the Board), finding that the Executive is in default hereunder. If
within ten (10) days of receipt of the notice the Board reasonably believes that
the Executive has performed the required services or has modified his
performance to correct the matters complained of, the Executive's breach will be
deemed cured, and the Executive shall not be terminated. However, if the nature
of the service not performed by the Executive or the matters complained of are
such that more than ten (10) days are reasonably required to perform the
required service or to correct the matters complained of, then his breach will
be deemed cured if the Executive commences to perform such service or to correct
such matters within the ten (10) day period and thereafter diligently prosecutes
such performance or correction to completion in a time frame established by the
Board, in its reasonable judgment. If the Executive does not perform the
required services or modify his performance to correct the matter complained of
within the ten (10) day period or the Board-approved extension thereof, the
Board shall have the right to terminate this Agreement at the end of the ten
(10) day period or extension thereof. If the Board, in its reasonable judgment,
determines that the Executive's breach of this Agreement pursuant to Section
5.2(a) is not capable of being cured, and in the event of any breach of the
Employee Agreement Concerning Protection of Company Property and the Arbitration
of Legal Disputes, referred to in Section 8 herein, the Company may terminate
the Executive immediately for Cause by written notice to the Executive.

            5.3 Without Cause. During the Employment Period and the Transition
Period, upon written notice given to the Executive, the Board may terminate the
Executive's employment under this Agreement other than for Cause.

            5.4 Termination by Executive for Good Reason. During the Employment
Period and the Transition Period, the Executive may terminate employment under
this

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Agreement by written notice for Good Reason. For purposes of this Agreement,
"Good Reason" shall mean: (a) the reduction of the Executive's Base Salary or
Transition Salary without Executive's consent; (b) the diminution, without his
consent, of the Executive's title, authority, duties or responsibilities as
specified in Section 3, or the assignment of duties and responsibilities that
are inconsistent with his position as Interim President and Chief Executive
Officer, or if the Executive reports to anyone other than the Board; (c) the
Company requiring the Executive, without his consent, to be based in any office
or location other than the Company's headquarters office, and such headquarters
shall not be located during the Employment Period outside of a 30-mile radius of
Cambridge; (d) the material breach by the Company of any provision of this
Agreement which has not been cured within thirty (30) days after a notice of
termination has been given by the Executive to the Company; or (e) failure of
the Company to obtain the assumption in writing of its obligations under this
Agreement by any successor.

            5.5 Date of Termination. "Date of Termination" shall mean:

                  (a) if the Executive's employment is terminated by the
Company, other than for Cause or Disability, the Date of Termination shall be
the date on which the Company notifies the Executive in writing of such
termination under Section 5.3;

                  (b) if the Executive's employment is terminated by the Company
for Cause, the Date of Termination shall be at the end of the 10-day period or
any extension given under Section 5.2;

                  (c) if the Executive's employment is terminated by the
Executive, the date of termination shall be the date on which the Executive
notifies the Company of such termination (or the date on which the Company
otherwise first learns of such termination);

                  (e) if the Executive's employment is terminated by reason of
death or Disability, the Date of Termination shall be the date of death of the
Executive or the Disability Effective Date, as the case may be.

      6. OBLIGATIONS OF THE COMPANY UPON TERMINATION.

            6.1 Cause, Death, Disability or Voluntarily by the Executive. If the
Executive's employment is terminated by reason of the Executive's death, the
Executive's Disability, for Cause by the Company or by the Executive voluntarily
(other than for Good Reason), the Executive, or the Executive's legal
representative, as the case may be, shall be entitled to receive (a) the
Executive's Base Salary or, if the Transition Period has commenced, the
Executive's Transition Salary through the Date of Termination; (b) any
compensation previously deferred by the Executive (together with any accrued
interest thereon through the Date of Termination) and not yet paid by the
Company, and any bonus earned in the previous year and not yet paid by the
Company; (c) any accrued vacation pay through the Date of Termination not yet
paid by the Company; and (d) a pro rata bonus for the year of termination
calculated and payable after year-end, if any, provided, however that no such
pro rata bonus shall be paid to the Executive if his employment is terminated
for Cause or voluntarily by the Executive without Good Reason (such amounts
specified in clauses (a), (b), (c) and (d) are

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hereinafter referred to as the "Accrued Obligations"). Accrued Obligations shall
not include other compensation not described in the preceding sentence accrued
but not yet paid through the date of termination. All such Accrued Obligations
except for that specified in clause (d) shall be paid to the Executive or to the
Executive's estate or beneficiary, as applicable, in a lump sum in cash within
thirty (30) days after the Date of Termination. In addition to the foregoing, if
the Executive's employment is terminated by reason of the Executive's death or
Disability or voluntarily by the Executive, unvested options granted to the
Executive during his employment shall immediately vest and remain exercisable
for one (1) year from the Date of Termination. In the case of death, the
Executive's family shall be entitled to receive any family death benefits
provided by the Company to surviving families of senior executives. In the case
of the Executive's Disability, the Executive shall be entitled as of the
Disability Effective Date to receive the disability benefits provided by the
Company to disabled senior executives.

            6.2 Termination Other Than for Cause, Death or Disability, or
Termination by the Executive for Good Reason. If the Company terminates the
Executive's employment (other than for Cause, death or Disability) during the
Employment Period or the Transition Period, or if the Executive terminates his
employment for Good Reason during the Employment Period or the Transition
Period, the Executive shall be entitled to receive, within thirty (30) days
after the Date of Termination, the following:

                  (a) The Company shall pay to the Executive all Accrued
Obligations.

                  (b) The Company shall pay to the Executive a lump sum equal to
100% of his annual Base Salary or, if the Transition Period has commenced, the
annualized value of the Executive's Transition Salary.

                  (c) If, at any time during the Executive's employment by the
Company as Interim President and Chief Executive Officer or otherwise
thereafter, there has been a Change in Control (as defined in the Company's 2002
Omnibus Securities and Incentive Plan), and his employment is thereafter
terminated during the 2-year period beginning on the date of such Change in
Control in accordance with this Section 6.2, then the Executive shall receive a
lump sum payment equal to 200% of the Executive's then current Salary or
Transition Salary.

                  (d) The Company shall pay its proportionate share of the cost
of the Executive's COBRA continuation coverage for a period of twelve (12)
months or 24 months if the Executive's employment terminates during the 2-year
period beginning on the date of Change in Control (as defined in the Company's
2002 Omnibus Securities and Incentive Plan).

                  (e) All unvested options granted to the Executive during his
employment shall immediately vest and remain exercisable for one (1) year from
the Date of Termination.

                  (f) The parties recognize and agree that, if the Company
terminates the Executive's employment during the Employment Period or the
Transition Period other than for Cause, death or Disability or if the Executive
terminates his employment during the Employment Period for Good Reason, the
actual damages to the Executive would be difficult if

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not impossible to ascertain and agree that the Executive's sole remedy shall be
a right to receive amounts determined and paid in accordance with the provisions
of this Section 6.2. The Executive shall not be required to mitigate the amount
of any payment provided for in this Section 6.2 by seeking other employment or
otherwise, nor shall any compensation earned by the Executive in other
employment or otherwise reduce the amount of any payment provided for in this
Section 6.2.

            6.3 Full Satisfaction. The payments received by the Executive (or
his legal representatives) under this Agreement that are attributable to the
termination of the Executive's employment shall be in full and complete
satisfaction of any and all claims the Executive (or his legal representatives)
may have against the Company which are, in any way, related to the employment
relationship (including the Executive's hiring) between the Executive and the
Company or the termination of that relationship.

            6.4 Other Payments. Notwithstanding anything to the contrary
contained herein (including without limitation Section 6.3), any compensation or
benefits, if any, which are vested in the Executive or which the Executive is
otherwise entitled to receive under any plan or program of the Company before,
at or subsequent to the Date of Termination shall be payable in accordance with
the terms and provisions of such plan or program. Any incentive, savings,
retirement, or welfare or fringe benefit plan or program may be changed by the
Company in its discretion, provided, however, that such change shall not
adversely affect, impair or impact the Executive (unless such change is
broad-based and applies to all current and former employees of the Company).

      7. TAXES. The Company may withhold from any amounts payable under this
Agreement such federal, state or local taxes or other withholdings as shall be
required or permitted to be withheld pursuant to any applicable law or
regulation, the operation of any incentive, savings, retirement, or welfare or
fringe benefit plan, or by written agreement with the Executive. In addition, if
any payment to the Executive would trigger "golden parachute" excise taxes
pursuant to Section 4999 of the Internal Revenue Code of 1986, as amended (the
"Code"), or any successor provision, a gross-up payment will be provided in an
amount sufficient to make the Executive whole for applicable excise taxes and
all income, employment, additional excise taxes or any interest or penalties
with respect to such gross-up payment (the "Gross-Up Payment"). All
determinations concerning whether a Gross-Up Payment is due to the Executive and
the amount of such Gross-Up Payment will be made by a nationally recognized
certified public accounting firm (the "Accounting Firm") selected by the Company
and subject to the approval of the Executive, such approval not to be
unreasonably withheld. If the Accounting Firm determines that any Gross-Up
Payment is due to the Executive, the Company shall pay the required Gross-Up
Payment to the Executive or on the Executive's behalf within ten (10) business
days after receipt of such determination and calculations. If the Accounting
Firm determines that no "golden parachute" excise taxes would be triggered, it
will, at the same time as it makes such determination, furnish the Executive
with an opinion that the Executive has substantial authority not to report any
excise tax on the Executive's federal, state, local income or other tax return.
Any determination by the Accounting Firm as to the amount of the Gross-Up
Payment will be binding on the Company and the Executive.

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      8. CONFIDENTIAL INFORMATION AND NON-COMPETITION. Nothing in this Agreement
shall be construed to alter the terms and conditions set forth in the Employee
Agreement Concerning Protection of Company Property and the Arbitration of Legal
Disputes (the "Employee Agreement") between the Executive and the Company
executed on November 30, 1999, which is attached hereto at Exhibit B and
incorporated herein by reference. The Executive agrees that the Employee
Agreement shall survive the termination of (a) this Agreement, (b) the
Employment Period, (c) the Transition Period, and/or (d) the Executive's
employment with the Company.

      9. INDEMNIFICATION.

            (a) During the Employment Period, the Company agrees that if the
Executive is made a party, or is threatened to be made a party, to any action,
suit or proceeding, whether civil, criminal, administrative or investigative (a
"Proceeding"), by reason of the fact that he is or was a director, officer or
employee of the Company or is or was serving at the request of the Company as a
director, officer, member, employee or agent of another corporation,
partnership, joint venture, trust or other enterprise, including service with
respect to employee benefit plans, whether or not the basis of such Proceeding
is the Executive's alleged action in an official capacity while serving as a
director, officer, member, employee or agent, the Executive shall be indemnified
and held harmless by the Company to the fullest extent legally permitted or
authorized by the Company's certificate of incorporation or bylaws or
resolutions of the Board or, if greater, by the laws of the State of Delaware,
against all cost, expense, liability and loss (including, without limitation,
attorney's fees, judgments, fines, ERISA excise taxes or penalties and amounts
paid or to be paid in settlement) reasonably incurred or suffered by the
Executive in connection therewith, and such indemnification shall continue as to
the Executive even if he has ceased to be a director, member, employee or agent
of the Company or other entity and shall inure to the benefit of the Executive's
heirs, executors and administrators. The Company shall advance to the Executive
all reasonable costs and expenses incurred by him in connection with a
Proceeding within 20 days after receipt by the Company of a written request for
such advance. Such request shall include an undertaking by the Executive to
repay the amount of such advance if it shall ultimately be determined in a final
judgment by a court (not subject to further appeal) that he is not entitled to
be indemnified against such costs and expenses.

            (b) Neither the failure of the Company (including its Board,
independent legal counsel or stockholders) to have made a determination prior to
the commencement of any proceeding concerning payment of amounts claimed by the
Executive under Section 9(a) that indemnification of the Executive is proper
because he has met the applicable standard of conduct, nor a determination by
the Company (including its Board, independent legal counsel or stockholders)
that the Executive has not met such applicable standard of conduct, shall create
a presumption that the Executive has not met the applicable standard of conduct.

            (c) The Company agrees to continue and maintain a directors and
officers' liability insurance policy covering the Executive to the extent the
Company provides such coverage for its other executive officers.

            (d) If, at any time after the termination of this Agreement and any
associated severance period, the Executive is requested by the Company, or is
required, to testify or to

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provide evidence or otherwise to perform services in relation to litigation or
similar proceedings (civil, administrative, arbitral or otherwise) in which the
Company is a named party or is otherwise involved the Company shall pay
Executive: (i) with respect to each day that Executive appears as a witness or
is deposed, the sum of $2,000 per day or portion thereof and (ii) with respect
to each day that Executive is involved in the preparation therefor, the sum of
$1,000 per day or portion thereof. Notwithstanding the foregoing, any time after
the termination of this Agreement, the Company shall reimburse Executive for
reasonable travel and accommodation expenses if such services are required to be
performed outside of the city of Executive's domicile.

      10. SUCCESSORS. This Agreement is personal to the Executive and may not be
assigned by the Executive. This Agreement shall inure to the benefit of, and be
enforceable by, the Executive and the Executive's legal representatives, as
applicable. This Agreement shall inure to the benefit of and be binding upon the
Company and its successors and assigns. The Company will require any successor
(whether direct or indirect, by purchase, merger, consolidation or otherwise) to
all or substantially all of the business and/or assets of the Company to assume
expressly and agree to perform this Agreement in the same manner and to the same
extent that the Company would be required to perform it if no such succession
had taken place.

      11. MISCELLANEOUS. This Agreement shall be governed by and construed in
accordance with the laws of the Commonwealth of Massachusetts, without reference
to principles of conflict of laws thereunder. The captions of this Agreement are
not part of the provisions hereof and shall not have any force or effect. This
Agreement may not be amended or modified otherwise than by a written agreement
executed by the parties hereto or their respective successors, assigns and legal
representatives. All notices and other communications hereunder shall be in
writing and shall be given by facsimile transmission, hand delivery to the other
party or by registered or certified mail, return receipt requested, postage
prepaid, to the addresses set forth above (in the case of the Company, to the
attention of the Chairman) or to such other address as either party shall have
furnished to the other in writing in accordance herewith. Any such notice and
communications shall be effective when actually received by the addressee. This
Agreement and the Exhibits hereto contain the entire understanding of the
Company and the Executive with respect to the subject matter hereof and
supersedes any prior oral or written agreement between the Company and the
Executive. All obligations of the Company under this Agreement shall be
irrevocably and unconditionally guaranteed by the Company. By its signature
below, the Company agrees to so guarantee all such obligations and waives any
rights to require the Executive to proceed against the Company or to pursue any
other remedy against any other person or entity whatsoever. The Company also
waives any rights of presentments, demands for performance, notices of non
performance, protests, notices of protest, notices of dishonor, and notices of
the acceptance of this guaranty and of the existence, creation or incurring of
new or additional indebtedness or obligations.

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      IN WITNESS WHEREOF, the Executive has signed this Agreement and, pursuant
to the authorization of its Board of Directors, the Company has caused this
Agreement to be signed in its name and on its behalf, all as of the day and year
first above written.

                                           BIOPURE CORPORATION

                                           By:   /s/ Charles A. Sanders
                                                     ---------------------------
                                                 Title: Chairman
                                                        ------------------------
                                                 Name:  Charles A. Sanders
                                                        ------------------------

                                                 /s/ Francis H Murphy
                                                 -------------------------------
                                                               Francis H. Murphy

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                                                                    EXHIBIT 10.1

                          REGISTRATION RIGHTS AGREEMENT

     THIS REGISTRATION RIGHTS AGREEMENT is made as of June 10, 2004, by and
between NaviSite, Inc., a Delaware corporation (the "Company"), and Surebridge,
Inc., a Delaware corporation ("Surebridge", and together with its permitted
assigns hereunder, the "Investors").

     This Agreement is made pursuant to a certain Asset Purchase Agreement dated
as of May 6, 2004 by and among the Company, a subsidiary of the Company and
Surebridge (the "Purchase Agreement"). The execution of this Agreement is a
condition to the closing of the transactions contemplated by the Purchase
Agreement.

     NOW, THEREFORE, the parties hereto, in consideration of the foregoing, the
mutual covenants and agreements hereinafter set forth, and other good and
valuable consideration, the receipt and sufficiency of which hereby are
acknowledged, agree as follows:

     1.   REGISTRATION STATEMENTS.

     (a)  Initial Registration.

          (i)  The Company shall, on or before the date which is 45 days after
the Closing Date, prepare and file with the Commission a Registration Statement
on Form S-3 or such other appropriate form (the "Initial Registration
Statement") for sale or distribution of the Initial Registrable Securities by
the Investors on a delayed or continuous basis under Rule 415 of the Securities
Act, and shall use its reasonable best efforts to cause such Initial
Registration Statement to be declared effective no later than the 180th day
after the Closing Date. The Company shall at its own expense, subject to Section
1(a)(iv), furnish to the Investors a Prospectus meeting the requirements of
Section 10(a) of the Securities Act during such period as the Company is
obligated to maintain the effectiveness of a Registration Statement pursuant to
Section 1(a)(ii).

          (ii) The Company shall use its reasonable best efforts to cause any
such Initial Registration Statement described in Section 1(a)(i) to remain
effective (or, if required by applicable law, to cause another Registration
Statement with respect to the Initial Registrable Securities to become and
remain effective) until the earlier to occur of: (i) such time as such
securities cease to be Initial Registrable Securities; and (ii) the date which
is two (2) years after the Closing Date.

          (iii) The Company shall, at all times during the Initial Registration
Period, subject to Section 1(a)(iv), as promptly as reasonably practicable: (A)
file such amendments to the Initial Registration Statement and the related
Prospectus, file such documents as may be required to be incorporated by
reference in any of such documents, and take all other reasonable actions in
furtherance of the ability of the holders of Initial Registrable Securities to

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effect the public resale or distribution of their Initial Registrable Securities
(including without limitation taking reasonable actions necessary to ensure the
availability of a Prospectus meeting the requirements of Section 10(a) of the
Securities Act) continuously through the Initial Registration Period.

          (iv) Notwithstanding anything to the contrary in this Agreement, the
Company may suspend the effectiveness of any Registration Statement, the use of
the Prospectus included in any Registration Statement and/or the sales of the
Registrable Securities, if, in its reasonable good faith judgment, (A) the
Company is engaged in a non-public activity or there is a pending material
development the disclosure of which would be materially detrimental to the
Company, (B) maintaining the effectiveness of such Registration Statement at
such time would materially adversely affect a proposed financing, reorganization
or recapitalization of the Company, or pending negotiations relating to a
merger, consolidation, acquisition or similar transaction involving the Company;
or (C) financial statements meeting the requirements of Regulation S-X are not
available at such time; provided, however, that the right of the Company
pursuant to this subsection (iv) to suspend the effectiveness of such
Registration Statement shall not extend for more than 60 total days in any
rolling period of 12 consecutive months during which Registrable Securities are
saleable and not otherwise restricted by the Purchase Agreement, the Notes or
this Agreement; and provided, further, that, if Registrable Securities are
otherwise saleable thereunder and not restricted by the Purchase Agreement, the
Notes or this Agreement, the Company shall give to each holder of Registrable
Securities prior written notice of such suspension at such Holder's most recent
address on file with the Company. Upon receipt of such notice, such holder shall
immediately discontinue any sales of Registrable Securities pursuant to such
Registration Statement.

     (b)  Note Conversion Registration.

          (i)  The Company shall, on or before the date which is 20 days after
the Company's receipt of a written request of the Investors holding at least a
majority of the principal amount of the Notes then outstanding on or after the
Conversion Date, prepare and file with the Commission a Registration Statement
on Form S-3 or such other appropriate form (the "Conversion Registration
Statement") for sale or distribution of the Conversion Registrable Securities by
the Investors on a delayed or continuous basis under Rule 415 of the Securities
Act, and shall use its reasonable best efforts to cause such Conversion
Registration Statement to be declared effective at the earliest practicable date
after the Conversion Date. The Company shall at its own expense, subject to
Section 1(b)(iv), furnish to the Investors a Prospectus meeting the requirements
of Section 10(a) of the Securities Act during such period as the Company is
obligated to maintain the effectiveness of a Registration Statement pursuant to
Section 1(b)(ii). Provided that the Company has (i) provided written notice to
each of the Investors of the request by an Investor or certain Investors to have
the Conversion Registration Statement filed and (ii) given such other investors
six (6) business days to notify the Company that they desire to have their
Conversion Registrable Securities registered thereby, and subject to section
1(b)(ii) below, the Company shall not be obligated to prepare, file or get
effective more than one Conversion Registration Statement.

          (ii) The Company shall use its reasonable best efforts to cause any
such Registration Statement described in Section 1(b)(i) to remain effective
(or, if required by

                                        2
<PAGE>

applicable law, to cause another Registration Statement with respect to the
Conversion Registrable Securities to become and remain effective) until the
earlier to occur of: (i) such time as such securities cease to be Conversion
Registrable Securities; and (ii) the date which is three (3) years after the
Effective Date of the Conversion Registration Statement.

          (iii) The Company shall, at all times during the Conversion
Registration Period, subject to Section 1(b)(iv), as promptly as reasonably
practicable: (A) file such amendments to the Conversion Registration Statement
and the related Prospectus, file such documents as may be required to be
incorporated by reference in any of such documents, and take all other
reasonable actions in furtherance of the ability of the holders of Conversion
Registrable Securities to effect the public resale or distribution of their
Conversion Registrable Securities (including without limitation taking
reasonable actions necessary to ensure the availability of a Prospectus meeting
the requirements of Section 10(a) of the Securities Act) continuously through
the Conversion Registration Period.

          (iv) Notwithstanding anything to the contrary in this Agreement, the
Company may suspend the effectiveness of any Registration Statement, the use of
the Prospectus included in any Registration Statement and/or the sales of the
Registrable Securities, if, in its reasonable good faith judgment, (A) the
Company is engaged in a non-public activity or there is a pending material
development the disclosure of which would be materially detrimental to the
Company, (B) maintaining the effectiveness of such Registration Statement at
such time would materially adversely affect a proposed financing, reorganization
or recapitalization of the Company, or pending negotiations relating to a
merger, consolidation, acquisition or similar transaction involving the Company;
or (C) financial statements meeting the requirements of Regulation S-X are not
available at such time; provided, however, that the right of the Company
pursuant to this subsection (iv) to suspend the effectiveness of such
Registration Statement shall not extend for more than 60 total days in any
rolling 12 month period; and provided, further, that the Company shall give to
each holder of Conversion Registrable Securities prior written notice of such
suspension at such holder's most recent address on file with the Company. Upon
receipt of such notice, such holder shall immediately discontinue any sales of
Registrable Securities pursuant to such Registration Statement.

     (c)  Amendments. Upon the occurrence of any event that would cause any
Registration Statement (i) to contain a material misstatement or omission or
(ii) not to be effective and usable for resale of Registrable Securities during
the period that such Registration Statement is required to be effective and
usable, the Company shall promptly file an amendment to such Registration
Statement, in the case of clause (i), correcting any such misstatement or
omission, and in the case of either clause (i) or (ii), using its reasonable
best efforts to cause such amendment to be declared effective and such
Registration Statement to become usable as soon as reasonably practicable
thereafter.

     (d)  Representation and Warranty. The Company represents and warrants to
the Investors that (i) any Registration Statement (including any amendments or
supplements thereto and prospectuses contained therein), at the time it is first
filed with the Commission, at the time it is declared effective by the
Commission and at all times during which it is required to be effective
hereunder (and each such amendment and supplement at the time it is filed with
the Commission and at all times during which it is available for use in
connection with the offer and

                                       3
<PAGE>

sale of the Registrable Securities) shall not contain any untrue statement of a
material fact or omit to state a material fact required to be stated therein or
necessary to make the statements therein not misleading and (ii) any Prospectus,
at the time any Registration Statement is declared effective by the Commission
and at all times, subject to Section 1(a)(iv) and Section 1(b)(iv) hereof, that
such Prospectus is required by this Agreement to be available for use by any
Investor and, in accordance with this Agreement, any Investor is entitled to
sell or distribute Registrable Securities pursuant to such Prospectus, shall not
contain any untrue statement of a material fact or omit to state a material fact
required to be stated therein, or necessary to make the statements therein, in
light of the circumstances in which they were made, not misleading.

     (e)  Incidental Registrations.

          (i)  Whenever the Company proposes to file a Registration Statement
(other than Registration Statement No. 333-112087 and any successor registration
statement thereto or a Registration Statement filed pursuant to Section 1 (a) or
1 (b) or on Form S-4 or Form S-8 or their then equivalents) at any time when any
Registrable Securities are not subject to the "Lockup" set forth in Section
5.11(b) of the Purchase Agreement, and from time to time, it will, prior to such
filing, give written notice to the Investors of its intention to do so;
provided, that no such notice need be given if no Registrable Securities are to
be included therein as a result of a determination of the managing underwriter
pursuant to Section 1(e)(ii). Upon the written request of an Investor or
Investors given within 10 business days after the Company provides such notice
(which request shall state the intended method of disposition of such
Registrable Securities), the Company shall use its reasonable best efforts to
cause all Registrable Securities which the Company has been requested to
register by such Investor or Investors to be registered under the Securities Act
to the extent necessary to permit their sale or other disposition in accordance
with the intended methods of distribution specified in the request of such
Investor or Investors; provided that the Company shall have the right to
postpone or withdraw any registration effected pursuant to this Section 1 (e)
without obligation to any Investor.

          (ii) If the registration for which the Company gives notice pursuant
to this Section 1 (e) is a registered public offering involving an underwriting,
the Company shall so advise the Investors as a part of the written notice given
pursuant to Section 1(e)(i). In such event, the right of any Investor to include
its Registrable Securities in such registration statement pursuant this Section
1(e) shall be conditioned upon such Investor's participation in such
underwriting on the terms set forth herein. All Investors proposing to
distribute their securities through such underwriting shall enter into an
underwriting agreement in customary form with the underwriter or underwriters
selected for the underwriting by the Company. Notwithstanding any other
provision of this Section 1(e), if the managing underwriter determines that the
inclusion of all shares requested to be registered would adversely affect the
offering, the Company may limit the number of Registrable Securities to be
included in the registration and underwriting. The Company shall so advise all
holders of Registrable Securities requesting registration, and the number of
shares that are entitled to be included in the registration and underwriting
shall be allocated among all Investors requesting registration in proportion, as
nearly as practicable, to the respective number of shares of Common Stock which
they held at the time the Company gives the notice specified in Section 1(e)(i).
If any Investor would thus be entitled to include more securities than such
holder requested to be registered, the excess shall be allocated among other
requesting Investors pro rata in the manner described in the preceding sentence.
If any

                                       4
<PAGE>

holder of Registrable Securities disapproves of the terms of any such
underwriting, such person may elect to withdraw therefrom by written notice to
the Company, and any Registrable Securities or other securities excluded or
withdrawn from such underwriting shall be withdrawn from such registration.

          (iii) Notwithstanding the foregoing, the Company shall not be
required, pursuant to this Section 1(e), to include any Registrable Securities
in a Registration Statement if such Registrable Securities can then be sold by
the holder thereof pursuant to Rule 144(k) under the Securities Act.

     (f)  Limitations on Subsequent Registration Rights. The Company shall not,
without the prior written consent of Investors holding at least a majority of
the Registrable Securities then held by all Investors, enter into any agreement
(other than this Agreement) with any holder or prospective holder of any
securities of the Company which grant such holder or prospective holder rights
to include securities of the Company in any Registration Statement if such
rights also prohibit the Investors from including Registrable Securities on a
pro rata basis with such holders or prospective holders based on the number of
shares of Common Stock owned by Investors and such holders or prospective
holders.

     2.   REGISTRATION PROCEDURES.

     In connection with any Registration Statement and subject to the provisions
of Section 1, and pursuant thereto the Company shall as expeditiously as
reasonably practicable:

     (a)  prepare and file with the Commission a Registration Statement relating
to the registration on Form S-3 or such other appropriate form under the
Securities Act, which form shall be available for the sale or distribution of
the Registrable Securities being sold in accordance with the intended method or
methods of distribution thereof and shall include all financial statements
required by the Commission to be filed therewith (including, if required by the
Securities Act or any regulation thereunder, financial statements of any
Subsidiary (as defined in Rule 405 under the Securities Act) of the Company
which shall have guaranteed any indebtedness of the Company), cooperate and
assist in any filings required to be made with the NASD and use its reasonable
best efforts to cause such Registration Statement to become effective and
approved by such governmental agencies or authorities as may be necessary to
enable the selling holders to consummate the disposition of such Registrable
Securities;

     (b)  prepare and file with the Commission such amendments and
post-effective amendments to such Registration Statement as may be necessary to
keep such Registration Statement effective for the applicable Registration
Period; in the case of any Registration Statement filed pursuant to Rule 415
under the Securities Act, cause the related Prospectus to be supplemented by any
required Prospectus supplement, and as so supplemented to be filed pursuant to
Rule 424 under the Securities Act, to add any permitted assignee or transferee
of any Investor as a "selling stockholder" therein and to comply fully with the
applicable provisions of Rules 424 and 430A under the Securities Act in a timely
manner, and to comply with the provisions of the Securities Act with respect to
the disposition of all securities covered by such Registration Statement during
the applicable period in accordance with the intended method or

                                       5
<PAGE>

methods of distribution by the sellers thereof set forth in such Registration
Statement or supplement to the Prospectus;

     (c)  advise the holders of the Registrable Securities promptly (and in any
event within one Business Day, by e-mail, fax or other type of communication)
and, if requested by such Persons, confirm such advice in writing:

          (i)  when any Prospectus or any Prospectus supplement or
post-effective amendment has been filed, and, with respect to such Registration
Statement or any post-effective amendment thereto, when the same has become
effective;

          (ii) of the existence of any fact and the happening of any event that
makes any statement of a material fact made in such Registration Statement, the
Prospectus, any amendment or supplement thereto, or any document incorporated by
reference therein untrue, or that requires the making of any additions to or
changes in such Registration Statement or the Prospectus in order to make the
statements therein not misleading; and

          (iii) of the issuance by the Commission of any stop order or other
order suspending the effectiveness of such Registration Statement, or any order
issued by any state securities commission or other regulatory authority
suspending the qualification or exemption from qualification of such Registrable
Securities under state securities or "blue sky" laws. If at any time the Company
shall receive any such stop order suspending the effectiveness of such
Registration Statement, or any such order from a state securities commission or
other regulatory authority, the Company shall use its reasonable best efforts to
obtain the withdrawal or lifting of such order at the earliest possible time.

     (d)  deliver to each holder of the Registrable Securities, without charge,
as many copies of any Prospectus and any amendment or supplement thereto as such
Person may reasonably request; the Company consents to the use of such
Prospectus and any amendment or supplement thereto by each of the holders of the
Registrable Securities in connection with the offering and the sale or
distribution of the Registrable Securities covered by such Prospectus or any
amendment or supplement thereto;

     (e)  prior to any public offering of Registrable Securities, reasonably
cooperate with the holders of the Registrable Securities and their respective
counsel in connection with the registration and qualification of the Registrable
Securities under the securities or "blue sky" laws of such jurisdictions as the
holders of the Registrable Securities may reasonably request in writing and do
any and all other acts or things reasonably necessary or advisable to enable the
disposition in such jurisdictions of the Registrable Securities covered by such
Registration Statement; 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;

     (f)  use its reasonable best efforts to cause the Registrable Securities
covered by such Registration Statement to be registered with or approved by such
other governmental agencies or authorities in the United States as may be
reasonably requested in writing by the seller or distributor thereof to
consummate the disposition of such Registrable Securities;

                                       6
<PAGE>

     (g)  if any fact or event contemplated by clause (c)(ii) above shall exist
or have occurred, prepare a supplement or post-effective amendment to such
Registration Statement or related Prospectus or any document incorporated
therein by reference or file any other required document so that, as thereafter
delivered to the purchasers of Registrable Securities, such Prospectus will not
contain any untrue statement of a material fact or omit to state any material
fact necessary to make the statements therein not misleading;

     (h)  otherwise use its reasonable best efforts to comply with all
applicable rules and regulations of the Commission;

     (i)  use its reasonable best efforts to cause all applicable Registrable
Securities to be listed on each securities exchange or market, if any, on which
equity securities issued by the Company are then listed; and

     (j)  use its reasonable best efforts to take all other steps reasonably
necessary to effect the registration of the applicable Registrable Securities
contemplated hereby.

     It shall be a condition precedent to the obligations of the Company
hereunder with respect to the registration of the Registrable Securities of a
particular Investor that such Investor shall furnish to the Company such
information regarding itself, the Registrable Securities held by it and the
intended method of disposition of the Registrable Securities held by it as shall
be reasonably requested by the Company in connection with its obligations under
this Agreement and shall execute such other documents in connection with such
registration as the Company may reasonably request.

     Each Investor by such Investor's acceptance of the Registrable Securities
agrees to cooperate with the Company as reasonably requested by the Company in
connection with the preparation and filing of any Registration Statement
hereunder, unless such Investor has notified the Company of such Investor's
election to exclude all of such Investor's Registrable Securities from such
Registration Statement.

     Each holder of the Registrable Securities agrees by acquisition of such
Registrable Securities that, upon receipt of any notice from the Company of the
existence of any fact of the kind described in Section 2(c)(ii), or notice of a
stop order or suspension described in Section 2(c)(iii), such holder shall
forthwith discontinue disposition of Registrable Securities and cease to use the
Prospectus in use under such Registration Statement. The Company shall, as
promptly as practicable, provide each holder with copies of the supplemented or
amended Prospectus contemplated by Section 2(g), or advise the holders in
writing that the use of the Prospectus may be resumed, and promptly provide each
holder with copies of any additional or supplemental filings which are
incorporated by reference in the Prospectus. If so directed by the Company, each
such holder shall deliver to the Company (at the Company's expense) all copies,
other than permanent file copies then in such holder's possession, of the
Prospectus covering such Registrable Securities current at the time of receipt
of such notice.

     If, pursuant to the terms of this Agreement, the Company gives notice to
each holder of Registrable Securities its intention to remove from registration
the Registrable Securities covered by the Registration Statement that have not
been sold, each holder shall notify

                                       7
<PAGE>

the Company promptly upon the receipt of such notice of the number of
Registrable Securities that are registered but remain unsold.

     3.   REGISTRATION EXPENSES. All reasonable expenses incident to the
Company's performance of or compliance with this Agreement shall be borne by the
Company, regardless of whether a Registration Statement becomes effective,
including without limitation:

     (a)  all registration and filing fees and expenses (including filings made
with the NASD);

     (b)  fees and expenses of compliance with federal securities and state
"blue sky" or securities laws (other than fees and expenses of compliance with
any state "blue sky" or securities laws to qualify such shares for resale in any
state other than The Commonwealth of Massachusetts and any other jurisdiction
pursuant to Section 2(e) of this Agreement);

     (c)  expenses of printing (including printing certificates for the
Registrable Securities and Prospectuses), messenger and delivery services and
telephone;

     (d)  all application and filing fees in connection with listing the
Registrable Securities on a national securities exchange or automated quotation
system pursuant to the requirements hereof; and

     (e)  all fees and disbursements of counsel of the Company and independent
certified public accountants of the Company (including the expenses of any
special audit and "cold comfort" letters required by or incident to such
performance).

     Notwithstanding the foregoing, the Company shall not be liable for any
underwriting commissions, discounts or brokerage fees, and taxes of any kind
(including, without limitation, transfer taxes) applicable to any disposition,
sale or transfer of the Registrable Securities and provided further that the
Company shall not be responsible for any legal, accounting or other
out-of-pocket expenses incurred by the Investors or the holders of the
Registrable Securities in connection with any Registration Statement; and
provided further, the Company shall have no obligation to pay any expenses of
any holder of Registrable Securities in connection with any registration,
qualification or compliance that is withdrawn, delayed or abandoned if such
withdrawal, delay or abandonment is a result of: (i) a request by a holder to
withdraw, delay or abandon such registration, qualification or compliance; (ii)
the failure to comply with the requirements hereof by a holder; or (iii) the
fraud or material misstatement or omission of a material fact by a holder to be
included or required to be included in such registration, qualification or
compliance.

     The Company shall, in any event, bear its internal expenses (including,
without limitation, all salaries and expenses of its officers and employees
performing legal or accounting duties), the expense of any annual audit, rating
agency fees and the fees and expenses of any Person, including special experts,
retained by the Company.

     In addition, notwithstanding anything to the contrary contained herein, the
Company shall pay all of the Investors' reasonable costs and expenses (including
reasonable legal fees) incurred in connection with the enforcement of the rights
of the Investors hereunder.

                                       8
<PAGE>

     4.   INTENTIONALLY OMITTED.

     5.   STAND-OFF AGREEMENT. Each Investor, if requested by the Company and
the managing underwriter of an underwritten public offering by the Company of
Common Stock, shall not sell or otherwise transfer or dispose of any Registrable
Securities or other securities of the Company held by such Investor for a period
of 90 days following the effective date of a Registration Statement; provided
that (i) all executive officers and directors of the Company and (ii) all Major
Stockholders enter into similar agreements. The Company may impose stop-transfer
instructions with respect to the Registrable Securities or other securities
subject to the foregoing restriction until the end of such 90-day period.

     6.   INDEMNIFICATION.

     (a)  The Company agrees to indemnify and hold harmless each holder of the
Registrable Securities and each Person, if any, who controls such holder within
the meaning of Section 15 of the Securities Act or Section 20 of the Exchange
Act from and against any and all losses, claims, damages, liabilities and
expenses (including, without limiting the foregoing but subject to Section 6(c),
the reasonable legal and other expenses incurred in connection with any action,
suit or proceeding or any claim asserted) to which they may become subject under
the Securities Act, the Exchange Act or other federal or state law, insofar as
such losses, claims, damages or liabilities (or actions in respect thereof)
arise out of or are based upon any untrue statement or alleged untrue statement
of a material fact contained in any Registration Statement or any Prospectus (as
amended or supplemented if the Company shall have furnished any amendments or
supplements thereto) or any preliminary prospectus, or arising out of or based
upon any omission or alleged omission to state therein a 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, except insofar
as such losses, claims, damages, liabilities or expenses are caused by an untrue
statement or omission contained in information relating to such holder,
furnished to the Company in writing by such holder expressly for use therein;
provided, however, that the indemnity agreement contained in this subsection
shall not apply to amounts paid in settlement of any such loss, claim, damage,
liability or action if such settlement is effected without the consent of the
Company, which consent shall not be unreasonably withheld, nor shall the Company
be liable in any such case for any such loss, claim, damage, liability or action
to the extent that a copy of the Prospectus or any amendment thereto relating to
the registration was timely provided to the holder by the Company but not
thereafter sent or given by or on behalf of such holder to the Company of the
holder's Registrable Securities, if required by law to have been delivered, at
or prior to the written confirmation of the sale of the Registrable Securities
to the Company, and if the Prospectus as so amended or supplemented would have
cured the defect giving rise to such loss, claim, damage or liability.

     (b)  As a condition to the inclusion of its Registrable Securities in any
Registration Statement pursuant to this Agreement, each holder thereof shall
furnish to the Company in writing, promptly after receipt of a request therefor,
such information as the Company may reasonably request for use in connection
with any Registration Statement, Prospectus or preliminary prospectus (including
such completed and executed questionnaires as the Company may reasonably
request) and agrees to indemnify and hold harmless, severally and not jointly,
the Company and its directors, its officers who sign such Registration
Statement, and

                                       9
<PAGE>

any Person controlling the Company within the meaning of Section 15 of the
Securities Act or Section 20 of the Exchange Act to the same extent as the
indemnity from the Company to each holder and Persons controlling such holder,
but only to the extent of losses, claims, damages, liabilities or expenses
caused by (i) an untrue statement or an omission contained in information
relating to such holder furnished in writing by such holder expressly for use in
such Registration Statement or the Prospectus or any preliminary prospectus
included therein, and of which none of the Company, its directors or officers
has any actual knowledge independent of such holder; provided, however, that
such holder of Registrable Securities shall not be liable in any such case to
the extent that the holder has furnished in writing to the Company prior to the
filing of any such Registration Statement, Prospectus or preliminary prospectus
information expressly for use in such Registration Statement, Prospectus or
preliminary prospectus which corrected or made not misleading information
previously furnished to the Company, and the Company failed to include such
information therein; and (ii) any failure of such holder to suspend or cease
sales of Registrable Securities pursuant to the Registration Statement during a
qualifying suspension period provided in this Agreement. In case any action
shall be brought against the Company, any of its directors, any such officer, or
any such controlling Person based on any Registration Statement, the Prospectus
or any preliminary prospectus and in respect of which indemnity may be sought
against one or more of the holders, such holders shall have the rights and
duties given to the Company by Section 6(c) (except that if the Company as
provided in Section 6(c) shall have assumed the defense thereof such holders
shall not be required to do so, but may employ separate counsel therein and
participate in the defense thereof but the fees and expenses of such counsel
shall be at such holder's expense unless the conditions in clauses (i), (ii) and
(iii) of Section 6(c) shall apply) and the Company and its directors, any such
officers, and any such controlling Person shall have the rights and duties given
to the holders by Section 6(c). In no event shall the aggregate liability of any
selling holder hereunder, together with any contribution, be greater than the
net proceeds (i.e., proceeds net of underwriting discounts, fees, commissions
and any other expenses payable by such selling holder) received by such holder
upon the sale of the Registrable Securities giving rise to such indemnification
obligation.

     (c)  In case any action or proceeding (including any governmental or
regulatory investigation or proceeding) shall be brought against any current or
former holder of the Registrable Securities or any Person controlling such
holder, with respect to which indemnity may be sought against the Company
pursuant to Section 6(a), such holder or such Person controlling such holder
shall promptly notify the Company in writing and the Company shall assume the
defense thereof, including the employment of counsel reasonably satisfactory to
such holder and payment of all fees and expenses relating thereto; provided,
that the failure of such holder to give notice as provided herein shall not
relieve the Company of its obligations hereunder except to the extent that the
Company is adversely affected by such failure. Such holder and such Persons
controlling such holder shall have the right to employ separate counsel in any
such action or proceeding and participate in the defense thereof, but the fees
and expenses of such counsel shall be at such holder's expense unless (i) the
employment of such counsel has been specifically authorized in writing by the
Company, (ii) the Company has not assumed the defense and employed counsel
reasonably satisfactory to such holder within 15 days after notice of any such
action or proceeding, or (iii) the named parties to any such action or
proceeding (including any impleaded parties) include both such holder or any
Person controlling such holder and the Company and such holder or any Person
controlling such holder shall have been advised by such counsel that there may
be one or more legal defenses available to such holder or Person

                                       10
<PAGE>

controlling such holder that are different from or additional to those available
to the Company and, in the reasonable opinion of counsel to such holder or
Person controlling such holder, could not be asserted by the Company's counsel
without creating a conflict of interest (in which case the Company shall not
have the right to assume the defense of such action or proceeding on behalf of
such holder or controlling Person, it being understood, however, that the
Company shall not, in connection with any one such action or separate but
substantially similar or related actions in the same jurisdiction arising out of
the same general allegations or circumstances, be liable for the reasonable fees
and expenses of more than one separate firm of attorneys (in addition to all
local counsel which is necessary, in the good faith opinion of both counsel for
the indemnifying party and counsel for the indemnified party in order to
adequately represent the indemnified parties) for all such holders and
controlling Persons, which firm shall be designated in writing by the holders of
a majority of the Registrable Securities currently or formerly held by such
holders and that all such fees and expenses shall be promptly reimbursed as they
are incurred upon written request and presentation of invoices). The Company
shall not be liable for any settlement of any such action effected without the
written consent of the Company (which consent shall not be unreasonably withheld
or delayed), but if settled with the written consent of the Company or if there
is a final judgment for the plaintiff, the Company agrees to indemnify and hold
harmless such holder and all Persons controlling such holder from and against
any loss or liability by reason of such settlement or judgment. The Company
shall not, without the prior written consent of the holder, effect any
settlement of any pending or threatened proceeding in respect of which any
holder or any Person controlling such holder is a party (or a potential party)
and indemnity has been sought hereunder by such holder or any Person controlling
such holder unless such settlement includes an unconditional release of such
holder or such controlling Person from all liability on claims that are the
subject matter of such proceeding.

     (d)  If the indemnification provided for in this Section 6 is unavailable
to an indemnified party under paragraphs (a), (b) or (c) hereof in respect of
any losses, claims, damages, liabilities or expenses referred to therein, then
each indemnifying party, in lieu of indemnifying such indemnified party, shall
contribute to the amount paid or payable by such indemnified party as a result
of such losses, claims, damages, liabilities and expenses in such proportion as
is appropriate to reflect the relative fault of the Company on the one hand and
such holders on the other hand in connection with the statements or omissions
which resulted in such losses, claims, damages, liabilities or expenses, as well
as any other relevant equitable considerations. The relative fault of the
Company on the one hand and such holders on the other hand shall be determined
by reference to, among other things, whether the untrue or alleged untrue
statement of a material fact or the omission to state a material fact relates to
information supplied by the Company on the one hand or by such holders on the
other hand and the parties' relative intent, knowledge, access to information
and opportunity to correct or prevent such statement or omission. The amount
paid or payable by an indemnified party as a result of the losses, claims,
damages, liabilities or expenses shall be deemed to include, subject to the
limitations set forth above, any legal or other expenses reasonably incurred by
such indemnified party in connection with investigating or defending any such
action or claim.

     (e)  The Company and the holders of the Registrable Securities agree that
it would not be just and equitable if contribution pursuant to this Section 6
were determined by a pro rata allocation or by any other method of allocation
that does not take account of the equitable considerations referred to in
subsection (d) above. The amount paid or payable by an

                                       11
<PAGE>

indemnified party as a result of the losses, claims, damages, liabilities and
expenses referred to in subsection (d) above shall be deemed to include, subject
to the limitations set forth above, any legal or other expenses reasonably
incurred by such indemnified party in connection with investigating any claim or
defending any such action, suit or proceeding. Notwithstanding any other
provision of this Agreement, no holder of the Registrable Securities shall be
required to contribute an amount greater than the net proceeds received by such
holder with respect to the sale of Registrable Securities giving rise to any
indemnification or contribution obligation under this Section 6. No person
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 guilty of such fraudulent misrepresentation.

     7.   RULE 144. The Company agrees with each holder of Registrable
Securities to:

     (a)  use its best efforts to comply with the requirements of Rule 144(c)
under the Securities Act with respect to current public information about the
Company;

     (b)  use its best efforts to file with the Commission in a timely manner
all reports and other documents required of the Company under the Exchange Act
(at any time it is subject to such reporting requirements); and

     (c)  so long as a holder owns any Registrable Securities, furnish to such
holder forthwith upon request (i) a written statement by the Company as to its
compliance with the requirements of said Rule 144(c) and the reporting
requirements of the Exchange Act (at any time it is subject to such reporting
requirements), (ii) a copy of the most recent annual or quarterly report of the
Company as filed with the Commission, and (iii) such other reports and documents
of the Company as such holder may reasonably request to avail itself of any
similar rule or regulation of the Commission allowing it to sell any such
securities without registration.

     8.   INTERPRETATION OF AGREEMENT; DEFINITIONS.

     (a)  Definitions. Unless the context otherwise requires, the terms
hereinafter set forth when used herein shall have the following meanings and the
following definitions shall be equally applicable to both the singular and
plural forms of any of the terms herein defined.

     "AFFILIATE" means, as to any Person, a Person which directly or indirectly
through one or more intermediaries controls, or is controlled by, or is under
common control with, the first Person. The term "control" means the possession,
directly or indirectly, of the power to direct or cause the direction of the
management and policies of a Person, whether through the ownership of voting
stock, through an investment advisory or other fiduciary arrangement, by
contract or otherwise, and the term "controlled" shall have a correlative
meaning.

     "AGREEMENT" means this Registration Rights Agreement and all Schedules
hereto.

     "BUSINESS DAY" means any day other than a Saturday, Sunday or other day on
which banks in Boston are required by law to close or are customarily closed.

                                       12
<PAGE>

     "CLOSING DATE" means the "Closing Date" under the Purchase Agreement.

     "COMMISSION" means the Securities and Exchange Commission as from time to
time constituted, created under the Exchange Act, or, if at any time after the
execution of this Agreement such Commission is not existing and performing the
duties now assigned to it under the Exchange Act, then the Person performing
such duties at such time.

     "COMMON STOCK" means the common stock, $0.01 par value per share, of the
Company.

     "COMPANY" has the meaning assigned in the first paragraph of this
Agreement.

     "CONVERSION DATE" means the date, if any, on which the Investors give
written notice of their intent to convert either the Primary Note or the Escrow
Note into shares of Common Stock pursuant to Section 9 of the Notes.

     "CONVERSION REGISTRABLE SECURITIES" means (a) all shares of Common Stock
received by the Investors upon the conversion of the Notes pursuant to the terms
thereof, including amounts that may be added to the Notes after its original
issuance pursuant to the provisions of the Purchase Agreement; (b) all shares of
Common Stock into which the Notes may be convertible, at the holder's option,
after a Conversion Date; and (c) any shares of capital stock issued or issuable,
from time to time, upon any reclassification, share combination, share
subdivision, stock split, share dividend, merger, consolidation or similar
transaction or event or otherwise as a distribution on, in exchange for, of or
with respect to the shares of Common Stock described in (a) or (b), in each case
held at the relevant time by an Investor. As to any particular securities, such
securities will cease to be Conversion Registrable Securities when (i) they have
been transferred in a public offering registered under the Securities Act, (ii)
they have been transferred in a sale made through a broker, dealer or
market-maker pursuant to Rule 144 under the Securities Act, (iii) the Investors
(including for this purpose the stockholders of Surebridge) are or would be able
to sell all of such securities under Rule 144 under the Securities Act during
any 90-day period without restriction (including without limitation, as to
volume by the holder thereof), (iv) the Investors (including for this purpose
the stockholders of Surebridge) are or would be able to sell all of such
securities under Rule 144(k) under the Securities Act, or (v) they have been
transferred other than as permitted by the Purchase Agreement, the Notes and
this Agreement.

     "CONVERSION REGISTRATION PERIOD" means the period from and after the
Conversion Date until the time determined by Section 1(b)(ii) hereof.

     "CONVERSION REGISTRATION STATEMENT" has the meaning assigned in Section
1(b)(i) of the Agreement.

     "EFFECTIVE DATE" means the date a Registration Statement is declared
effective by the Commission.

     "EXCHANGE ACT" means the Securities Exchange Act of 1934, as amended.

                                      13

<PAGE>
     "INITIAL REGISTRABLE SECURITIES" means (a) the "Parent Shares" under the
Purchase Agreement and (b) any shares of capital stock issued or issuable, from
time to time, upon any reclassification, share combination, share subdivision,
stock split, share dividend, merger, consolidation or similar transaction or
event or otherwise as a distribution on, in exchange for, of or with respect to,
the shares of Common Stock described in (a), in each case held at the relevant
time by an Investor. As to any particular securities, such securities will cease
to be Initial Registrable Securities when (i) they have been transferred in a
public offering registered under the Securities Act, (ii) they have been
transferred in a sale made through a broker, dealer or market-maker pursuant to
Rule 144 under the Securities Act, (iii) the Investors (including for this
purpose the stockholders of Surebridge) are or would be able to sell all of such
securities under Rule 144 under the Securities Act during any 90-day period
without restriction (including without limitation, as to volume by the holder
thereof), (iv) the Investors (including for this purpose the stockholders of
Surebridge) are or would be able to sell all of such securities under Rule
144(k) under the Securities Act, or (v) they have been transferred other than as
permitted by the Purchase Agreement, the Notes and this Agreement.

     "INITIAL REGISTRATION PERIOD" means the period from and after the Effective
Date until the time determined by Section 1(a)(ii) hereof.

     "INITIAL REGISTRATION STATEMENT" has the meaning assigned in Section
1(a)(i) of the Agreement.

     "INVESTORS" means, collectively, Surebridge, and any successors or
permitted assignees of any of its rights hereunder that hold Registrable
Securities, including any stockholder of Surebridge that receives Registrable
Securities in a distribution from Surebridge.

     "MAJOR STOCKHOLDERS" means (i) any Person that, together with its
Affiliates, owns greater than twenty percent (20%) of the Company's outstanding
Common Stock; (ii) for so long as they beneficially own at least ten percent
(10%) of the outstanding stock of the Company, Atlantic Investors, LLC, or any
successor entity, and (iii) any Affiliate of Atlantic Investors, LLC that has
received stock of the Company directly or indirectly from Atlantic Investors,
LLC.

     "NASD" means National Association of Securities Dealers, Inc.

     "NOTES" means the "Primary Note" and the "Escrow Note" under the Purchase
Agreement.

     "PERSON" means any natural person, corporation, partnership, limited
liability company, trust or unincorporated organization, incorporated
government, government agency or political subdivision thereof.

     "PROSPECTUS" means the prospectus included in a Registration Statement, as
amended or supplemented by any prospectus supplement and by all other amendments
thereto, including post-effective amendments, and all material incorporated by
reference into such Prospectus.

                                       14
<PAGE>

     "REGISTRABLE SECURITIES" means the Initial Registrable Securities and the
Conversion Registrable Securities, if any.

     "REGISTRATION PERIOD" means the Initial Registration Period or the
Conversion Registration Period, as applicable.

     "REGISTRATION STATEMENT" means any registration statement of the Company
relating to the registration under the Securities Act for resale or distribution
of Registrable Securities, including any registration statement filed pursuant
to the provisions of this Agreement, including the Prospectus included therein,
all amendments and supplements thereto (including post-effective amendments) and
all exhibits and material incorporated by reference therein.

     "SECURITIES ACT" means the Securities Act of 1933, as amended.

     (b)  Accounting Principles. Where the character or amount of any asset or
liability or item of income or expense is required to be determined or any
consolidation or other accounting computation is required to be made for the
purposes of this Agreement, the same shall be done in accordance with the
generally accepted accounting principles in effect from time to time, to the
extent applicable, except where such principles are inconsistent with the
express requirements of this Agreement including without limitation the
definitions set out in Section 7.

     (c)  Directly or Indirectly. Where any provision in this Agreement refers
to action to be taken by any Person, or which such Person is prohibited from
taking, such provision shall be applicable whether the action in question is
taken directly or indirectly by such Person.

     9.   MISCELLANEOUS.

     (a)  Remedies. Each holder of the Registrable Securities, in addition to
being entitled to exercise all rights provided herein, and granted by law,
including recovery of damages, shall be entitled to seek specific performance of
its rights under this Agreement. The Company agrees that monetary damages may
not be adequate compensation for any loss incurred by reason of a breach by it
of the provisions of this Agreement.

     (b)  No Inconsistent Agreements. The Company shall not, on or after the
date of this Agreement, enter into any agreement with respect to its securities
that is inconsistent with the rights granted to such holders of the Registrable
Securities in this Agreement or otherwise conflicts with the provisions hereof.
The rights granted to the holders hereunder do not in any way conflict with and
are not inconsistent with the rights granted to the holders of the Company's
securities under any other agreements.

     (c)  Amendments and Waivers. The provisions of this Agreement, including
the provisions of this sentence, may not be amended, modified or supplemented,
and waivers or consents to departures from the provisions hereof may not be
given without the written consent of the Company and the holders of a majority
of Registrable Securities then outstanding.

     (d)  Notices. Any notices required or permitted to be given under the terms
of this Agreement shall be in writing and shall be sent by mail, personal
delivery, by telephone line

                                       15
<PAGE>

facsimile transmission or courier and shall be effective three (3) days after
being placed in the mail, if mailed, or upon receipt, if delivered personally,
by telephone line facsimile transmission or by courier, in each case addressed
to a party at such party's address (or telephone line facsimile transmission
number) shown in the introductory paragraph or on the signature page of this
Agreement or such other address (or telephone and facsimile transmission
numbers) as a party shall have provided by notice to the other parties in
accordance with this provision. Such notices shall be delivered to the following
addresses:

                     If to the Company:
                                    NaviSite, Inc.
                                    400 Minuteman Road
                                    Andover, MA 01810
                                    Attention: Ken Drake, Esq.
                                    Telecopy No.: (978) 946-7803

                     With a copy to:
                                    Browne Rosedale Lanouette LLP
                                    31 St. James Avenue, Suite 830
                                    Boston, MA 02116
                                    Attention: Thomas B. Rosedale, Esq.
                                    Telecopy No.: (617) 399-6930

                     If to the Investors:
                                    Surebridge, Inc.
                                    c/o Spectrum Equity Investors, L.P.
                                    One International Place, 29th Floor
                                    Boston, Massachusetts  02110
                                    Attention: Michael J. Kennealy
                                    Facsimile: 617-464-4601

                     With a copy to:

                                    Goodwin Procter LLP
                                    Exchange Place
                                    53 State Street
                                    Boston, MA  02109
                                    Attention: Stuart M. Cable, P.C.
                                    Telecopy No.:  (617) 523-1231

     (e)  Successors and Assigns. This Agreement shall inure to the benefit of
and be binding upon the successors and permitted assigns of the Company and the
Investors, including without limitation and without the need for an express
assignment, Affiliates, stockholders, partners and members of the Investors. The
rights and obligations of an Investor under this Agreement shall be
automatically assigned by such Investor to any transferee of all or any portion
of such Investor's Registrable Securities; provided, however, that within a
reasonable time after the transfer, (i) the Company is provided notice of the
transfer including the name and address of the transferee and the number of
Registrable Securities transferred; and (ii) that such permitted transferee
agrees in writing to be bound by the terms of this Agreement and

                                       16
<PAGE>

the Company is provided a copy of the transferee's agreement. Upon any transfer
permitted by this Section 9(e), the Company shall be obligated to such
transferee to perform all of its covenants under this Agreement as if such
transferee were an Investor.

     (f)  Counterparts. This Agreement may be executed in any number of
counterparts and by the parties hereto in separate counterparts, each of which
when so executed shall be deemed to be an original and all of which taken
together shall constitute one and the same agreement.

     (g)  Governing Law. THE CORPORATE LAW OF THE STATE OF DELAWARE SHALL GOVERN
ALL ISSUES AND QUESTIONS CONCERNING THE RELATIVE RIGHTS AND OBLIGATIONS OF THE
COMPANY AND ITS STOCKHOLDERS. ALL OTHER ISSUES AND QUESTIONS CONCERNING THE
CONSTRUCTION, VALIDITY, ENFORCEMENT AND INTERPRETATION OF THIS AGREEMENT AND THE
EXHIBITS AND SCHEDULES HERETO SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE
WITH THE LAWS OF THE STATE OF DELAWARE, WITHOUT GIVING EFFECT TO THE CONFLICTS
OF LAW PRINCIPLES THEREOF.

     (h)  Severability. Should any part of this Agreement for any reason be
declared invalid, such decision shall not affect the validity of any remaining
portion, which remaining portion shall remain in force and effect as if this
Agreement had been executed with the invalid portion thereof eliminated and it
is hereby declared the intention of the parties hereto that they would have
executed the remaining portion of this Agreement without including therein any
such part, parts, or portion which may, for any reason, be hereafter declared
invalid.

     (i)  Captions. The descriptive headings of the various Sections or parts of
this Agreement are for convenience only and shall not affect the meaning or
construction of any of the provisions hereof.

     (j)  Waiver of Jury Trial. EACH OF THE COMPANY AND THE INVESTORS WAIVES ANY
RIGHT TO A TRIAL BY JURY IN ANY ACTION OR PROCEEDING TO ENFORCE OR DEFEND ANY
RIGHTS UNDER THIS AGREEMENT OR UNDER ANY AMENDMENT, INSTRUMENT, DOCUMENT OR
AGREEMENT DELIVERED OR WHICH MAY IN THE FUTURE BE DELIVERED IN CONNECTION
HEREWITH OR ARISING FROM ANY RELATIONSHIP EXISTING IN CONNECTION WITH THIS
AGREEMENT, AND AGREES THAT ANY SUCH ACTION OR PROCEEDING SHALL BE TRIED BEFORE A
COURT AND NOT BEFORE A JURY.

     (k)  Final Agreement. THIS WRITTEN AGREEMENT REPRESENTS THE FINAL AGREEMENT
BETWEEN THE PARTIES AND MAY NOT BE CONTRADICTED BY EVIDENCE OF PRIOR,
CONTEMPORANEOUS OR SUBSEQUENT ORAL AGREEMENTS OF THE PARTIES.

                [Remainder of this page intentionally left blank]

                                       17
<PAGE>

     IN WITNESS WHEREOF, each of the parties hereto has executed this Agreement,
or caused this Agreement to be duly executed on its behalf, as of the date first
written.

                             NAVISITE, INC.

                             By:     /s/ Arthur P. Becker
                                     -----------------------------------------

                             Name:    Arthur P. Becker
                                      -----------------------------------------

                             Title:   President and CEO
                                      -----------------------------------------

                             SUREBRIDGE, INC.

                             By:      /s/ Peter J. Boni
                                      -----------------------------------------

                             Name:    Peter J. Boni
                                      -----------------------------------------

                             Title:   Chairman and CEO
                                      -----------------------------------------

                                       18

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