Document:

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                                                                   EXHIBIT 10.48

                                  EQUINIX, INC.

                          2001 Supplemental Stock Plan

                         (As Adopted SEPTEMBER 26, 2001)

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                                TABLE OF CONTENTS

                                                                            Page

ARTICLE I.   INTRODUCTION ...........................................          1

ARTICLE II.  ADMINISTRATION .........................................          1
  2.1        Committee Composition ..................................          1
  2.2        Committee Responsibilities .............................          1

ARTICLE III. SHARES AVAILABLE FOR GRANTS ............................          1
  3.1        Basic Limitation .......................................          1
  3.3        Additional Shares ......................................          1
  3.4        Dividend Equivalents ...................................          2

ARTICLE IV.  ELIGIBILITY ............................................          2
  4.1        Other Grants ...........................................          2

ARTICLE V.   OPTIONS ................................................          2
  5.1        Stock Option Agreement .................................          2
  5.2        Number of Shares .......................................          2
  5.3        Exercise Price .........................................          2
  5.4        Exercisability and Term ................................          2
  5.5        Modification or Assumption of Options ..................          2
  5.6        Buyout Provisions ......................................          2

ARTICLE VI.  PAYMENT FOR OPTION SHARES ..............................          3
  6.1        General Rule ...........................................          3
  6.2        Surrender of Stock .....................................          3
  6.3        Exercise/Sale ..........................................          3
  6.4        Exercise/Pledge ........................................          3
  6.5        Promissory Note ........................................          3
  6.6        Other Forms of Payment .................................          3

ARTICLE VII. RESTRICTED SHARES ......................................          4
  7.1        Restricted Stock Agreement .............................          4
  7.2        Payment for Awards .....................................          4
  7.3        Vesting Conditions .....................................          4
  7.4        Voting and Dividend Rights .............................          4

             ARTICLE VIII. CHANGE IN CONTROL ........................          4
  8.1        Effect of Change in Control ............................          4
  8.2        Involuntary Termination ................................          4

ARTICLE IX.  PROTECTION AGAINST DILUTION ............................          5
  9.1        Adjustments5

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   9.2         Dissolution or Liquidation ..........................           5
   9.3         Reorganizations .....................................           5

ARTICLE X.     DEFERRAL OF AWARDS ..................................           5

ARTICLE XI.    LIMITATION ON RIGHTS ................................           6
  11.1         Retention Rights ....................................           6
  11.2         Stockholders' Rights ................................           6
  11.3         Regulatory Requirements .............................           6

ARTICLE XII.   WITHHOLDING TAXES ...................................           6
  12.1         General .............................................           6
  12.2         Share Withholding ...................................           6

               ARTICLE XIII. FUTURE OF THE PLAN ....................           7
  13.1         Term of the Plan ....................................           7
  13.2         Amendment or Termination ............................           7

ARTICLE XIV.   DEFINITIONS .........................................           7

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                                  EQUINIX, INC.
                          2001 Supplemental Stock Plan

ARTICLE I     INTRODUCTION.

            The Plan was adopted by the Board to be effective on September 26,
2001. The purpose of the Plan is to promote the long-term success of the Company
and the creation of stockholder value by (a) encouraging Employees and
Consultants to focus on critical long-range objectives, (b) encouraging the
attraction and retention of Employees and Consultants with exceptional
qualifications, and (c) linking Employees and Consultants directly to
stockholder interests through increased stock ownership. The Plan seeks to
achieve this purpose by providing for awards in the form of Restricted Shares or
Options (which shall be nonstatutory stock options).

            The Plan shall be governed by, and construed in accordance with, the
laws of the State of Delaware (except their choice-of-law provisions).

ARTICLE II    ADMINISTRATION.

            2.1   Committee Composition. The Plan shall be administered by the
Committee. The Committee shall consist exclusively of one or more directors of
the Company, who shall be appointed by the Board.

            2.2 Committee Responsibilities. The Committee shall (a) select the
Employees and Consultants who are to receive awards under the Plan, (b)
determine the type, number, vesting requirements and other features and
conditions of such awards, (c) interpret the Plan and (d) make all other
decisions relating to the operation of the Plan. The Committee may adopt such
rules or guidelines as it deems appropriate to implement the Plan. The
Committee's determinations under the Plan shall be final and binding on all
persons.

ARTICLE III   SHARES AVAILABLE FOR GRANTS.

            3.1 Basic Limitation. Shares of Common Stock issued pursuant to the
Plan may be authorized but unissued shares or treasury shares or re-acquired
shares. The aggregate number of Options and Restricted Shares awarded under the
Plan shall not exceed (a) 5,000,000, plus (b) the additional shares of Common
Stock described in Sections 3.2 and 3.3. The limitations of this Section 3.1 and
Section 3.2 shall be subject to adjustment pursuant to Article 9.

            3.2 Additional Shares. If Restricted Shares or shares of Common
Stock issued upon the exercise of Options are forfeited, then such shares of
Common Stock shall again become available for awards under the Plan. If Options
are forfeited or terminate for any other reason before being exercised, then the
corresponding shares of Common Stock shall again become available for awards
under the Plan.

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            3.3   Dividend Equivalents. Any dividend equivalents paid or
credited under the Plan shall not be applied against the number of Restricted
Shares or Options available for awards.

ARTICLE IV    ELIGIBILITY.

            4.1   Other Grants. Employees and Consultants shall be eligible for
the grant of Restricted Shares and NSOs. Outside Directors and Executive
Officers shall not be eligible for awards under the Plan.

ARTICLE V     OPTIONS.

            5.1 Stock Option Agreement. Each grant of an Option under the Plan
shall be evidenced by a Stock Option Agreement between the Optionee and the
Company. Such Option shall be subject to all applicable terms of the Plan and
may be subject to any other terms that are not inconsistent with the Plan. The
provisions of the various Stock Option Agreements entered into under the Plan
need not be identical. Options may be granted in consideration of a reduction in
the Optionee's other compensation. A Stock Option Agreement may provide that a
new Option will be granted automatically to the Optionee when he or she
exercises a prior Option and pays the Exercise Price in the form described in
Section 6.2.

            5.2 Number of Shares. Each Stock Option Agreement shall specify the
number of shares of Common Stock subject to the Option and shall provide for the
adjustment of such number in accordance with Article 9.

            5.3 Exercise Price. Each Stock Option Agreement shall specify the
Exercise Price; provided that the Exercise Price under an NSO shall in no event
be less than 85% of the Fair Market Value of a Common Share on the date of
grant. A Stock Option Agreement may specify an Exercise Price that varies in
accordance with a predetermined formula while the NSO is outstanding.

            5.4   Exercisability and Term. Each Stock Option Agreement shall
specify the date or event when all or any installment of the Option is to become
exercisable. The Stock Option Agreement shall also specify the term of the
Option. A Stock Option Agreement may provide for accelerated exercisability in
the event of the Optionee's death, disability or retirement or other events and
may provide for expiration prior to the end of its term in the event of the
termination of the Optionee's service.

            5.5 Modification or Assumption of Options. Within the limitations of
the Plan, the Committee may modify, extend or assume outstanding options or may
accept the cancellation of outstanding options (whether granted by the Company
or by another issuer) in return for the grant of new options for the same or a
different number of shares and at the same or a different exercise price. The
foregoing notwithstanding, no modification of an Option shall, without the
consent of the Optionee, alter or impair his or her rights or obligations under
such Option.

            5.6   Buyout Provisions. The Committee may at any time (a) offer to
buy out for a payment in cash or cash equivalents an Option previously granted
or (b) authorize an

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Optionee to elect to cash out an Option previously granted, in either case at
such time and based upon such terms and conditions as the Committee shall
establish.

ARTICLE VI    PAYMENT FOR OPTION SHARES.

            6.1 General Rule. The entire Exercise Price of shares of Common
Stock issued upon exercise of Options shall be payable in cash or cash
equivalents at the time when such shares of Common Stock are purchased and the
Committee may at any time accept payment in any form(s) described in this
Article 6.

            6.2 Surrender of Stock. To the extent that this Section 6.2 is
applicable, all or any part of the Exercise Price may be paid by surrendering,
or attesting to the ownership of, shares of Common Stock that are already owned
by the Optionee. Such shares of Common Stock shall be valued at their Fair
Market Value on the date when the new shares of Common Stock are purchased under
the Plan. The Optionee shall not surrender, or attest to the ownership of,
shares of Common Stock in payment of the Exercise Price if such action would
cause the Company to recognize compensation expense (or additional compensation
expense) with respect to the Option for financial reporting purposes.

            6.3 Exercise/Sale. To the extent that this Section 6.3 is
applicable, all or any part of the Exercise Price and any withholding taxes may
be paid by delivering (on a form prescribed by the Company) an irrevocable
direction to a securities broker approved by the Company to sell all or part of
the shares of Common Stock being purchased under the Plan and to deliver all or
part of the sales proceeds to the Company.

            6.4 Exercise/Pledge. To the extent that this Section 6.4 is
applicable, all or any part of the Exercise Price and any withholding taxes may
be paid by delivering (on a form prescribed by the Company) an irrevocable
direction to pledge all or part of the shares of Common Stock being purchased
under the Plan to a securities broker or lender approved by the Company, as
security for a loan, and to deliver all or part of the loan proceeds to the
Company.

            6.5 Promissory Note. To the extent that this Section 6.5 is
applicable, all or any part of the Exercise Price and any withholding taxes may
be paid by delivering (on a form prescribed by the Company) a full-recourse
promissory note. However, the par value of the shares of Common Stock being
purchased under the Plan, if newly issued, shall be paid in cash or cash
equivalents.

            6.6 Other Forms of Payment. To the extent that this Section 6.6 is
applicable, all or any part of the Exercise Price and any withholding taxes may
be paid in any other form that is consistent with applicable laws, regulations
and rules.

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ARTICLE VII   RESTRICTED SHARES.

            7.1 Restricted Stock Agreement. Each grant of Restricted Shares
under the Plan shall be evidenced by a Restricted Stock Agreement between the
recipient and the Company. Such Restricted Shares shall be subject to all
applicable terms of the Plan and may be subject to any other terms that are not
inconsistent with the Plan. The provisions of the various Restricted Stock
Agreements entered into under the Plan need not be identical.

            7.2 Payment for awards. Subject to the following sentence,
Restricted Shares may be sold or awarded under the Plan for such consideration
as the Committee may determine, including (without limitation) cash, cash
equivalents, full-recourse promissory notes, past services and future services.
To the extent that an award consists of newly issued Restricted Shares, the
consideration shall consist exclusively of cash, cash equivalents or past
services rendered to the Company (or a Parent or Subsidiary) or, for the amount
in excess of the par value of such newly issued Restricted Shares, full-recourse
promissory notes, as the Committee may determine.

            7.3 Vesting Conditions. Each award of Restricted Shares may or may
not be subject to vesting. Vesting shall occur, in full or in installments, upon
satisfaction of the conditions specified in the Restricted Stock Agreement. A
Restricted Stock Agreement may provide for accelerated vesting in the event of
the Participant's death, disability or retirement or other events.

            7.4 Voting and Dividend Rights. The holders of Restricted Shares
awarded under the Plan shall have the same voting, dividend and other rights as
the Company's other stockholders. A Restricted Stock Agreement, however, may
require that the holders of Restricted Shares invest any cash dividends received
in additional Restricted Shares. Such additional Restricted Shares shall be
subject to the same conditions and restrictions as the award with respect to
which the dividends were paid.

ARTICLE VIII  CHANGE IN CONTROL.

            8.1 Effect of Change in Control. In the event of any Change in
Control, each outstanding award shall automatically accelerate so that each such
award shall, immediately prior to the effective date of the Change in Control,
become fully exercisable for all of the shares of Common Stock at the time
subject to such award and may be exercised for any or all of those shares as
fully-vested shares of Common Stock. However, an outstanding award shall not so
accelerate if and to the extent such award is, in connection with the Change in
Control, either to be assumed by the successor corporation (or parent thereof)
or to be replaced with a comparable award for shares of the capital stock of the
successor corporation (or parent thereof). The determination of award
comparability shall be made by the Plan Administrator, and its determination
shall be final, binding and conclusive.

            8.2 Involuntary Termination. In addition, in the event that the
award is assumed by the successor corporation (or parent thereof) and the
Participant experiences an Involuntary Termination within eighteen months
following a Change in Control, each outstanding award shall automatically
accelerate so that each such award shall, immediately

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prior to the effective date of the Involuntary Termination, become fully
exercisable for all of the shares of Common Stock at the time subject to such
award and may be exercised for any or all of those shares as fully-vested shares
of Common Stock.

ARTICLE IX.   PROTECTION AGAINST DILUTION.

            9.1 Adjustments. In the event of a subdivision of the outstanding
shares of Common Stock, a declaration of a dividend payable in shares of Common
Stock, a declaration of a dividend payable in a form other than shares of Common
Stock in an amount that has a material affect on the price of shares of Common
Stock, a combination or consolidation of the outstanding shares of Common Stock
(by reclassification or otherwise) into a lesser number of shares of Common
Stock, a recapitalization, a spin-off or a similar occurrence, the Committee
shall make such adjustments as it deems appropriate in order to prevent the
dilution or enlargement of benefits thereunder, in one or more of:

                  (a) The number of Options or Restricted Shares available for
future awards under Article 3;

                  (b) The number of shares of Common Stock covered by each
outstanding Option; or

                  (c) The Exercise Price under each outstanding Option.

Except as provided in this Article 9, a Participant shall have no rights by
reason of any issue by the Company of stock of any class or securities
convertible into stock of any class, any subdivision or consolidation of shares
of stock of any class, the payment of any stock dividend or any other increase
or decrease in the number of shares of stock of any class.

            9.2 Dissolution or Liquidation. To the extent not previously
exercised or settled, Options shall terminate immediately prior to the
dissolution or liquidation of the Company.

            9.3 Reorganizations. In the event that the Company is a party to a
merger or other reorganization, outstanding awards shall be subject to the
agreement of merger or reorganization. Such agreement shall provide for (a) the
continuation of the outstanding awards by the Company, if the Company is a
surviving corporation, (b) the assumption of the outstanding awards by the
surviving corporation or its parent or subsidiary, (c) the substitution by the
surviving corporation or its parent or subsidiary of its own awards for the
outstanding awards, (d) full exercisability or vesting and accelerated
expiration of the outstanding awards or (e) settlement of the full value of the
outstanding awards in cash or cash equivalents followed by cancellation of such
awards.

ARTICLE X.    DEFERRAL OF AWARDS.

            The Committee (in its sole discretion) may permit or require a
Participant to have shares of Common Stock that otherwise would be delivered to
such Participant as a result of the exercise of an Option converted into amounts
credited to a deferred compensation account established for such Participant by
the Committee as an entry on the Company's books. Such

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amounts shall be determined by reference to the Fair Market Value of such shares
of Common Stock as of the date when they otherwise would have been delivered to
such Participant.

            A deferred compensation account established under this Article 10
may be credited with interest or other forms of investment return, as determined
by the Committee. A Participant for whom such an account is established shall
have no rights other than those of a general creditor of the Company. Such an
account shall represent an unfunded and unsecured obligation of the Company and
shall be subject to the terms and conditions of the applicable agreement between
such Participant and the Company. If the deferral or conversion of awards is
permitted or required, the Committee (in its sole discretion) may establish
rules, procedures and forms pertaining to such awards, including (without
limitation) the settlement of deferred compensation accounts established under
this Article 10.

ARTICLE XI.   LIMITATION ON RIGHTS.

            11.1 Retention Rights. Neither the Plan nor any award granted under
the Plan shall be deemed to give any individual a right to remain an Employee or
Consultant. The Company and its Parents, Subsidiaries and Affiliates reserve the
right to terminate the service of any Employee, or Consultant at any time, with
or without cause, subject to applicable laws, the Company's certificate of
incorporation and by-laws and a written employment agreement (if any).

            11.2 Stockholders' Rights. A Participant shall have no dividend
rights, voting rights or other rights as a stockholder with respect to any
shares of Common Stock covered by his or her award prior to the time when a
stock certificate for such shares of Common Stock is issued or, if applicable,
the time when he or she becomes entitled to receive such shares of Common Stock
by filing any required notice of exercise and paying any required Exercise
Price. No adjustment shall be made for cash dividends or other rights for which
the record date is prior to such time, except as expressly provided in the Plan.

            11.3 Regulatory Requirements. Any other provision of the Plan
notwithstanding, the obligation of the Company to issue shares of Common Stock
under the Plan shall be subject to all applicable laws, rules and regulations
and such approval by any regulatory body as may be required. The Company
reserves the right to restrict, in whole or in part, the delivery of shares of
Common Stock pursuant to any award prior to the satisfaction of all legal
requirements relating to the issuance of such shares of Common Stock, to their
registration, qualification or listing or to an exemption from registration,
qualification or listing.

ARTICLE XII.  WITHHOLDING TAXES.

            12.1 General. To the extent required by applicable federal, state,
local or foreign law, a Participant or his or her successor shall make
arrangements satisfactory to the Company for the satisfaction of any withholding
tax obligations that arise in connection with the Plan. The Company shall not be
required to issue any shares of Common Stock or make any cash payment under the
Plan until such obligations are satisfied.

            12.2  Share Withholding. The Committee may permit a Participant to
satisfy all or part of his or her withholding or income tax obligations by
having the Company withhold

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all or a portion of any shares of Common Stock that otherwise would be issued to
him or her or by surrendering all or a portion of any shares of Common Stock
that he or she previously acquired. Such shares of Common Stock shall be valued
at their Fair Market Value on the date when taxes otherwise would be withheld in
cash.

ARTICLE XIII. FUTURE OF THE PLAN.

            13.1 Term of the Plan. The Plan, as set forth herein, shall become
effective on September 26, 2001. The Plan shall remain in effect until it is
terminated under Section 13.2.

            13.2 Amendment or Termination. The Board may, at any time and for
any reason, amend or terminate the Plan. An amendment of the Plan shall be
subject to the approval of the Company's stockholders only to the extent
required by applicable laws, regulations or rules. No awards shall be granted
under the Plan after the termination thereof. The termination of the Plan, or
any amendment thereof, shall not affect any award previously granted under the
Plan.

ARTICLE XIV.  DEFINITIONS.

            14.1 "Affiliate" means any entity other than a Subsidiary, if the
Company and/or one or more Subsidiaries own not less than 50% of such entity.

            14.2 "Board" means the Company's Board of Directors, as constituted
from time to time.

            14.3  "Change in Control" shall mean:

                  (a) The consummation of a merger or consolidation of the
Company with or into another entity or any other corporate reorganization, if
persons who were not stockholders of the Company immediately prior to such
merger, consolidation or other reorganization own immediately after such merger,
consolidation or other reorganization 50% or more of the voting power of the
outstanding securities of each of (i) the continuing or surviving entity and
(ii) any direct or indirect parent corporation of such continuing or surviving
entity;

                  (b) The sale, transfer or other disposition of all or
substantially all of the Company's assets;

                  (c) A change in the composition of the Board, as a result of
which fewer than 50% of the incumbent directors are directors who either (i) had
been directors of the Company on the date 24 months prior to the date of the
event that may constitute a Change in Control (the "original directors") or (ii)
were elected, or nominated for election, to the Board with the affirmative votes
of at least a majority of the aggregate of the original directors who were still
in office at the time of the election or nomination and the directors whose
election or nomination was previously so approved; or

                  (d) Any transaction as a result of which any person is the
"beneficial owner" (as defined in Rule 13d-3 under the Exchange Act), directly
or indirectly, of securities of the Company representing at least 50% of the
total voting power represented by the Company's

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then outstanding voting securities. For purposes of this Paragraph (d), the term
"person" shall have the same meaning as when used in sections 13(d) and 14(d) of
the Exchange Act but shall exclude(i) a trustee or other fiduciary holding
securities under an employee benefit plan of the Company or of a Parent or
Subsidiary and (ii) a corporation owned directly or indirectly by the
stockholders of the Company in substantially the same proportions as their
ownership of the common stock of the Company.

A transaction shall not constitute a Change in Control if its sole purpose is to
change the state of the Company's incorporation or to create a holding company
that will be owned in substantially the same proportions by the persons who held
the Company's securities immediately before such transaction.

            14.4  "Code" means the Internal Revenue Code of 1986, as amended.

            14.5  "Committee" means a committee of the Board, as described in
Article 2.

            14.6  "Common Stock" means the common stock of the Company.

            14.7  "Company" means Equinix, Inc., a Delaware corporation.

            14.8 "Consultant" means a consultant or adviser who provides bona
fide services to the Company, a Parent, a Subsidiary or an Affiliate as an
independent contractor. Service as a Consultant shall be considered employment
for all purposes of the Plan, except as provided in Section 4.1.

            14.9  "Employee" means a common-law employee of the Company, a
Parent, a Subsidiary or an Affiliate.

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

            14.11 "Exercise Price," in the case of an Option, means the amount
for which one Common Share may be purchased upon exercise of such Option, as
specified in the applicable Stock Option Agreement.

            14.12 "Executive Officer" means an officer of the Company who is
subject to the short-swing profit rules under Section 16 of the Exchange Act.

            14.13 "Fair Market Value" means the market price of one share of
Common Stock, determined by the Committee in good faith on such basis as it
deems appropriate. Whenever possible, the determination of Fair Market Value by
the Committee shall be based on the prices reported in The Wall Street Journal.
Such determination shall be conclusive and binding on all persons.

            14.14 "Involuntary Termination" means the termination of the Service
of any individual which occurs by reason of:

                  (a) such individual's involuntary dismissal or discharge by
the Company for reasons other than Misconduct, or

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                  (b) such individual's voluntary resignation following (A) a
change in his or her position with the Company which materially reduces his or
her level of responsibility, (B) a reduction in his or her level of compensation
(including base salary, fringe benefits and participation in bonus or incentive
programs) or (C) a relocation of such individual's place of employment by more
than fifty (50) miles, provided and only if such change, reduction or relocation
is effected by the Company without the individual's consent.

            14.15 "Misconduct" means the commission of any act of fraud,
embezzlement or dishonesty by the Optionee or Participant, any unauthorized use
or disclosure by such person of confidential information or trade secrets of the
Company (or any Parent or Subsidiary), or any other intentional misconduct by
such person adversely affecting the business or affairs of the Company (or any
Parent or Subsidiary) in a material manner. The foregoing definition shall not
be deemed to be inclusive of all the acts or omissions which the Company (or any
Parent or Subsidiary) may consider as grounds for the dismissal or discharge of
any Optionee or Participant or other person in the Service of the Company (or
any Parent or Subsidiary).

            14.16 "NSO" means a stock option not described in sections 422 or
423 of the Code.

            14.17 "Option" means an NSO granted under the Plan and entitling the
holder to purchase shares of Common Stock.

            14.18 "Optionee" means an individual or estate who holds an Option.

            14.19 "Outside Director" shall mean a member of the Board who is not
an Employee.

            14.20 "Parent" means any corporation (other than the Company) in an
unbroken chain of corporations ending with the Company, if each of the
corporations other than the Company owns stock possessing 50% or more of the
total combined voting power of all classes of stock in one of the other
corporations in such chain. A corporation that attains the status of a Parent on
a date after the adoption of the Plan shall be considered a Parent commencing as
of such date.

            14.21 "Plan" means this Equinix, Inc. 2001 Supplemental Stock Plan,
as amended from time to time.

            14.22 "Restricted Share" means a Common Share awarded under the
Plan.

            14.23 "Restricted Stock Agreement" means the agreement between the
Company and the recipient of a Restricted Share which contains the terms,
conditions and restrictions pertaining to such Restricted Share.

            14.24 "Stock Option Agreement" means the agreement between the
Company and an Optionee that contains the terms, conditions and restrictions
pertaining to his or her Option.

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            14.25 "Subsidiary" means any corporation (other than the Company) in
an unbroken chain of corporations beginning with the Company, if each of the
corporations other than the last corporation in the unbroken chain owns stock
possessing 50% or more of the total combined voting power of all classes of
stock in one of the other corporations in such chain. A corporation that attains
the status of a Subsidiary on a date after the adoption of the Plan shall be
considered a Subsidiary commencing as of such date.

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                                                                    EXHIBIT 4.01

             FIFTH AMENDED AND RESTATED INVESTORS' RIGHTS AGREEMENT

     This Fifth Amended and Restated Investors' Rights Agreement (this
"Agreement") is made and entered into as of October 3, 2001, by and among
NetScreen Technologies, Inc., a Delaware corporation (the "Company"), and the
persons and entities listed on Exhibit A attached hereto (the "Investors").
Comdisco, Inc. is a party to this Agreement for all purposes other than the
provisions of Sections 1 and 5 hereof. GATX Ventures, Inc. is a party to this
Agreement for all purposes other than the provisions of Sections 1, 2.2, 2.4, 3
and 5 hereof.

                                R E C I T A L S
                                ---------------

     A.   Certain of the Investors (the "Prior Investors") are holders of
outstanding shares of the Company's Series A Preferred Stock ("Series A Stock"),
Series B Preferred Stock ("Series B Stock"), Series C Preferred Stock ("Series C
Stock") Series D Preferred Stock ("Series D Stock") and/or Series E Preferred
Stock ("Series E Stock") issued by the Company to such Prior Investors pursuant
to Preferred Stock Purchase Agreements by and among the Company and the Prior
Investors (the "Prior Purchase Agreements"). The Prior Investors have been
granted certain information and registration rights and rights of first refusal
under a Fourth Amended and Restated Investors' Rights Agreement by and among the
Company and such Investors dated as of June 30, 2000, as amended by that certain
Amendment thereto dated February 28, 2001 (such agreement, as so amended the
"Prior Rights Agreement").

     B.   Certain Investors (the "Series F Investors") have agreed to purchase
shares of the Company's Series F Preferred Stock ("Series F Stock") pursuant to
a certain Series F Preferred Stock Purchase Agreement by and among the Company
and such Series F Investors dated of even date herewith(the "Series F
Agreement"). The Series F Agreement provides that, as a condition to the Series
F Investors' purchase of Series F Stock thereunder, the Company will enter into
this Agreement and the Series F Investors willbe granted the rights set forth
herein.

     C.   The Company and the undersigned parties hereto desire to enter into
this Agreement in order to amend, restate and replace their rights and
obligations under the Prior Rights Agreement with the rights and obligations set
forth in this Agreement. Section 4.2 of the Prior Rights Agreement provides that
the Prior Rights Agreement may be amended by the written consent of the holders
of a majority of the "Investors' Shares" (as defined in Section 4.2 of the Prior
Rights Agreement) and the undersigned parties to this Agreement hold a majority
of the Investors' Shares, as defined in the Prior Rights Agreement.

     NOW, THEREFORE, in consideration of the foregoing recitals and the mutual
 promises hereinafter set forth, the parties hereto agree as follows:

     1.   INFORMATION RIGHTS.
          ------------------

          1.1  Financial Information. The Company covenants and agrees that,
commencing on the date of this Agreement, for so long as any Investor holds at
least 120,000 shares of Preferred Stock and/or the equivalent number (on an
as-converted basis) of shares of

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Common Stock of the Company ("Common Stock") (together, the "Conversion Stock")
the Company will:

               (a)  Annual Reports. Furnish to such Investor, as soon as
practicable and in any event within 120 days after the end of each fiscal year
of the Company, a consolidated balance sheet of the Company and its subsidiaries
as of the end of such fiscal year, a consolidated statement of income and a
consolidated statement of cash flows of the Company and its subsidiaries for
such year, setting forth in each case in comparative form the figures from the
Company's previous fiscal year (if any), all prepared in accordance with
generally accepted accounting principles and practices and audited by nationally
recognized independent certified public accountants;

               (b)  Quarterly Reports. Furnish to such Investor as soon as
practicable, and in any case within thirty (30) days of the end after each
calendar quarter (except the last quarter of the Company's fiscal year),
quarterly unaudited financial statements, including an unaudited consolidated
balance sheet, and an unaudited consolidated statement of income and an
unaudited consolidated statement of cash flows of the Company and its
subsidiaries, with an instrument executed on behalf of the Company by the Chief
Financial Officer, Chief Executive Officer or President of the Company
certifying that such financial statements were prepared in accordance with
generally accepted accounting principles applied on a consistent basis, except
for the absence of normal audit adjustments and the absence of other supporting
statements, schedules and footnotes; and

               (c)  Annual Budget. Furnish to such Investor as soon as
practicable and in any event no later than thirty (30) days after the close of
each fiscal year of the Company, an annual operating plan and budget, prepared
on a monthly basis, for the next immediate fiscal year. The Company shall also
furnish to such Investor, within a reasonable time of its preparation,
amendments to the annual budget, if any.

          1.2  Inspection Rights. The Company shall permit each Investor holding
at least 400,000 shares of Preferred Stock and/or the equivalent number (on an
as-converted basis) of shares of Conversion Stock, or any combination thereof,
at such Investor's expense, to visit and inspect the Company's properties, to
examine its books of account and records and to discuss the Company's affairs,
finances and accounts with its officers, all at such reasonable times as may be
requested by such Investor.

          1.3  Confidentiality. Each Investor agrees to hold all information
received pursuant to this Section 1 in confidence, and not to use or disclose
any of such information to any third party for a period of two years from
receipt of the information in question, except to the extent (a) such
information may be made publicly available by the Company or (b) the disclosure
of such information is required by law (provided such Investor provides the
Company with prompt written notice so that the Company may seek a protective
order or other appropriate remedy).

          1.4  Termination of Certain Rights. The Company's obligations under
Sections 1.1 and 1.2 above will terminate upon the earlier to occur of (a) the
closing of the first

<PAGE>

public offering of Common Stock pursuant to an effective registration statement
filed under the Securities Act of 1933, as amended (the "1933 Act"), and (b) the
time at which the Company becomes subject to the reporting requirements of the
Securities Exchange Act of 1934, as amended (the "1934 Act"), other than in
connection with the Company's initial public offering.

     2.   REGISTRATION RIGHTS.
          -------------------

          2.1  Definitions. For purposes of this Section 2:

               (a)  Registration. The terms "register," "registered," and
"registration" refer to a registration effected by preparing and filing a
registration statement in compliance with the 1933 Act, and the declaration or
ordering of effectiveness of such registration statement.

               (b)  Registrable Securities. The term "Registrable Securities"
means: (i) all the shares of Common Stock of the Company issued or issuable upon
the conversion of any shares of Series A Stock, Series B Stock, Series C Stock,
Series D Stock, Series E Stock and Series F Stock; (ii) all the other shares of
Common Stock of the Company held from time to time by the Series F Investors;
(iii) all the shares of Common Stock directly or indirectly issuable upon
conversion or exercise of the warrants to purchase Series C Stock and Series D
Stock held by Comdisco, Inc. (which entity is deemed to be a party hereto); (iv)
all shares of Common Stock directly or indirectly issuable upon conversion or
exercise of the warrant to purchase 41,284 shares of Series E Stock held by GATX
Ventures, Inc.; and (v) any shares of Common Stock of the Company issued as (or
issuable upon the conversion or exercise of any warrant, right or other security
which is issued as) a dividend or other distribution with respect to, or in
exchange for or in replacement of, all such shares of Common Stock described in
clause (i) of this subsection (b) excluding in all cases, however, any
Registrable Securities sold by a person in a transaction in which rights under
this Section 2 are not assigned in accordance with this Agreement or any
Registrable Securities sold to the public or sold pursuant to Rule 144
promulgated under the 1933 Act.

               (c)  Registrable Securities Then Outstanding. The number of
shares of "Registrable Securities then outstanding" shall mean the number of
shares of Common Stock which are Registrable Securities and (i) are then issued
and outstanding; (ii) are then issuable pursuant to the exercise or conversion
of then outstanding and then exercisable options, warrants or convertible
securities; and (iii) are then issuable as a dividend or other distribution with
respect to, or in exchange for or in replacement of, all such shares of Common
Stock described in subsection (b)(i).

               (d)  Holder. For purposes of this Section 2 and Sections 3 and 4
hereof, the term "Holder" means (i) any person owning of record Registrable
Securities that have not been sold to the public or pursuant to Rule 144
promulgated under the 1933 Act or (ii) any assignee of record of such
Registrable Securities to whom rights under this Section 2 have been duly
assigned in accordance with this Agreement; provided, however, that for purposes
of this Agreement, a record holder of shares of Series A Stock, Series B Stock,
Series C Stock, Series D Stock, Series E Stock, or Series F Stock convertible
into such Registrable Securities shall be

<PAGE>

deemed to be the Holder of such Registrable Securities; and provided, further,
that the Company shall in no event be obligated to register shares of Series A
Stock, Series B Stock, Series C Stock, Series D Stock, Series E Stock, or Series
F Stock and that Holders of Registrable Securities will not be required to
convert their shares of Series A Stock, Series B Stock, Series C Stock, Series D
Stock, Series E Stock, or Series F Stock into Common Stock in order to exercise
the registration rights granted hereunder, until immediately before the closing
of the offering to which the registration relates.

               (e)  Form S-3. The term "Form S-3" means such form under the 1933
Act as is in effect on the date hereof or any successor registration form under
the 1933 Act subsequently adopted by the SEC which permits inclusion or
incorporation of substantial information by reference to other documents filed
by the Company with the SEC.

               (f)  SEC. The term "SEC" or "Commission" means the U.S.
Securities and Exchange Commission.

          2.2  Demand Registration.

               (a)  Request by Holders. If the Company shall receive at any time
after the earlier of (i) the third anniversary of this Agreement, or (ii) six
(6) months after the effective date of the Company's initial public offering of
its securities pursuant to a registration filed under the 1933 Act, a written
request from the Holders of at least twenty-five percent (25%) of the
Registrable Securities then outstanding that the Company file a registration
statement under the 1933 Act covering the registration of Registrable Securities
pursuant to this Section 2.2, then the Company shall, within ten (10) business
days of the receipt of such written request, give written notice of such request
("Request Notice") to all Holders, and effect, as soon as practicable, and in
any event within ninety (90) days after receipt of the request or requests of
the Initiating Holders (as defined below), the registration under the 1933 Act
of all Registrable Securities which Holders request to be registered and
included in such registration by written notice given by such Holders to the
Company within twenty (20) days after receipt of the Request Notice, subject
only to the limitations of this Section 2.2; provided that the Registrable
Securities requested by Holders to be registered pursuant to such request must
be at least twenty-five percent (25%) of all Registrable Securities then
outstanding (or any lesser percentage if the anticipated aggregate public
offering price equals or exceeds $5,000,000 (before deduction of underwriters'
discounts and commissions)).

               (b)  Underwriting. If the Holders initiating the registration
request under this Section 2.2 ("Initiating Holders") intend to distribute the
Registrable Securities covered by their request by means of an underwriting,
then they shall so advise the Company as a part of their request made pursuant
to this Section 2.2 and the Company shall include such information in the
written notice referred to in subsection 2.2(a). In such event, the right of any
Holder to include his Registrable Securities in such registration shall be
conditioned upon such Holder's participation in such underwriting and the
inclusion of such Holder's Registrable Securities in the underwriting (unless
otherwise mutually agreed by a majority in interest of the Initiating Holders
and such Holder) to the extent provided herein. All Holders proposing to
distribute their securities through such underwriting shall enter into an
underwriting agreement in

<PAGE>

customary form with the managing underwriter or underwriters selected for such
underwriting by the Company. Notwithstanding any other provision of this Section
2.2, if the underwriter(s) advise(s) the Company in writing that marketing
factors require a limitation of the number of securities to be underwritten then
the Company shall so advise all Holders of Registrable Securities which would
otherwise be registered and underwritten pursuant hereto, and the number of
Registrable Securities that may be included in the underwriting shall be reduced
as required by the underwriter(s) and allocated among the Holders of Registrable
Securities on a pro rata basis according to the number of Registrable Securities
then outstanding held by each Holder requesting registration (including the
Initiating Holders); provided, however, that the number of shares of Registrable
Securities to be included in such underwriting and registration shall not be
reduced unless all other securities of the Company are first entirely excluded
from the underwriting and registration. Any Registrable Securities excluded and
withdrawn from such underwriting shall be withdrawn from the registration.

               (c)  Maximum Number of Demand Registrations. The Company is
obligated to effect only two (2) registrations pursuant to this Section 2.2. A
registration shall not count toward such limit if the request for registration
is withdrawn by the Holders of a majority of the Registrable Securities sought
to be included in such registration and all expenses incurred in connection with
the registration are borne and reimbursed to the Company by the Holders making
the request for registration.

               (d)  Deferral. Notwithstanding the foregoing, if the Company
shall furnish to Holders requesting the filing of a registration statement
pursuant to this Section 2.2, a certificate signed by the President or Chief
Executive Officer of the Company stating that in the good faith judgment of the
Board of Directors of the Company, it would be seriously detrimental to the
business of the Company for such registration statement to be filed and it is
therefore essential to defer the filing of such registration statement, then the
Company shall have the right to defer such filing for a period of not more than
120 days after receipt of the request of the Initiating Holders; provided,
however, that the Company may not utilize this right more than once in any
twelve (12) month period. If the Company shall so delay the filing of a
registration statement, it shall promptly notify the applicable Holders of such
determination, and such Holders shall have the right to withdraw the relevant
request for registration, in which case such registration shall not count
towards the limit set forth in Section 2.2(c).

               (e)  Expenses. Other than as set forth in Section 2.2(c), All
expenses incurred in connection with a registration pursuant to this Section
2.2, including without limitation all registration and qualification fees,
printers' and accounting fees, fees and disbursements of counsel for the Company
(but excluding underwriters' discounts and commissions), shall be borne by the
Company. Each Holder participating in a registration pursuant to this Section
2.2 shall bear such Holder's proportionate share (based on the total number of
shares sold in such registration by such Holder other than for the account of
the Company) of all discounts, commissions or other amounts payable to
underwriters or brokers in connection with such offering. Notwithstanding the
foregoing, the Company shall not be required to pay for any expenses of any
registration proceeding begun pursuant to this Section 2.2 if the registration
request is subsequently withdrawn at the request of the Holders of a majority of
the Registrable Securities to be registered, unless the Holders of a majority of
the Registrable

                                        5

<PAGE>

Securities then outstanding agree to forfeit their right to one (1) demand
registration pursuant to this Section 2.2 (in which case such right shall be
forfeited by all Holders of Registrable Securities); provided, further, however,
that if at the time of such withdrawal, the Holders have learned of a material
adverse change in the condition, business, or prospects of the Company not known
to the Holders at the time of their request for such registration and have
withdrawn their request for registration with reasonable promptness after
learning of such material adverse change, then the Holders shall not be required
to pay any of such expenses and shall retain their rights pursuant to this
Section 2.2.

          2.3  Piggyback Registrations. The Company shall notify all Holders of
Registrable Securities in writing at least thirty (30) days prior to filing any
registration statement under the 1933 Act for purposes of effecting a public
offering of securities of the Company (including, but not limited to,
registration statements relating to secondary offerings of securities of the
Company, but excluding registration statements relating to any registration
under Section 2.2 or Section 2.4 of this Agreement or to any employee benefit
plan or a corporate reorganization or to an initial public offering of
securities of the Company for the Company's account) and will afford each such
Holder an opportunity to include in such registration statement all or any part
of the Registrable Securities then held by such Holder. Each Holder desiring to
include in any such registration statement all or any part of the Registrable
Securities held by such Holder shall, within twenty (20) days after receipt of
the above-described notice from the Company, so notify the Company in writing,
and in such notice shall inform the Company of the number of Registrable
Securities such Holder wishes to include in such registration statement. If a
Holder decides not to include all of its Registrable Securities in any
registration statement thereafter filed by the Company, such Holder shall
nevertheless continue to have the right to include any Registrable Securities in
any subsequent registration statement or registration statements as may be filed
by the Company with respect to offerings of its securities, all upon the terms
and conditions set forth herein.

               (a)  Underwriting. If a registration statement under which the
Company gives notice under this Section 2.3 is for an underwritten offering,
then the Company shall so advise the Holders of Registrable Securities as a part
of the notice referred to in this Section 2.3. In such event, the right of any
such Holder's Registrable Securities to be included in a registration pursuant
to this Section 2.3 shall be conditioned upon such Holder's participation in
such underwriting and the inclusion of such Holder's Registrable Securities in
the underwriting to the extent provided herein. All Holders proposing to
distribute their Registrable Securities through such underwriting shall enter
into an underwriting agreement in customary form with the managing underwriter
or underwriter(s) selected for such underwriting. Notwithstanding any other
provision of this Agreement, if the managing underwriter determine(s) in good
faith that marketing factors require a limitation of the number of shares to be
underwritten, then the managing underwriter(s) may exclude shares (including
Registrable Securities) from the registration and the underwriting, and the
number of shares that may be included in the registration and the underwriting
shall be allocated, first, to the Company, and second, to each of the Holders
requesting inclusion of their Registrable Securities in such registration
statement on a pro rata basis based on the total number of Registrable
Securities then held by each such Holder; provided however, that the right of
the underwriters to exclude shares (including Registrable Securities) from the
registration and underwriting as described above shall

                                       6

<PAGE>

be restricted so that the number of Registrable Securities included in any such
registration is not reduced below twenty-five percent (25%) of the shares
included in the registration, except for a registration relating to the
Company's initial public offering from which all Registrable Securities may be
excluded. If any Holder disapproves of the terms of any such underwriting, such
Holder may elect to withdraw therefrom by written notice to the Company and the
underwriter, delivered at least ten (10) business days prior to the effective
date of the registration statement. Any Registrable Securities excluded or
withdrawn from such underwriting shall be excluded and withdrawn from the
registration.

               (b)  Expenses. All expenses incurred in connection with the first
three registrations pursuant to this Section 2.3 (excluding underwriters' and
brokers' discounts and commissions), including, without limitation all federal
and "blue sky" registration and qualification fees, printers' and accounting
fees, fees and disbursements of counsel for the Company shall be borne by the
Company. All expenses incurred in connection with subsequent registrations
pursuant to this Section 2.3 shall be apportioned among, and borne by, the
Company and the participating Holders in the manner specified in Section 2.4(c).

          2.4  Form S-3 Registration. In case the Company shall receive from any
Holder or Holders of at least ten percent (10%) of all Registrable Securities
then outstanding a written request or requests that the Company effect a
registration on Form S-3 and any related qualification or compliance with
respect to all or a part of the Registrable Securities owned by such Holder or
Holders, then the Company will:

               (a)  Notice. Promptly give written notice of the proposed
registration and the Holder's or Holders' request therefor, and any related
qualification or compliance, to all other Holders of Registrable Securities; and

               (b)  Registration. As soon as practicable, effect such
registration and all such qualifications and compliances as may be so requested
and as would permit or facilitate the sale and distribution of all or such
portion of such Holder's or Holders' Registrable Securities as are specified in
such request, together with all or such portion of the Registrable Securities of
any other Holder or Holders joining in such request as are specified in a
written request given within twenty (20) days after receipt of such written
notice from the Company; provided, however, that the Company shall not be
obligated to effect any such registration, qualification or compliance pursuant
to this Section 2.4:

                    (i)   if Form S-3 is not available for such offering by the
Holders;

                    (ii)  if the Holders, together with the holders of any other
securities of the Company entitled to inclusion in such registration, propose to
sell Registrable Securities and such other securities (if any) at an aggregate
price to the public of less than $1,000,000;

                    (iii)  if the Company shall furnish to the Holders a
certificate signed by the President or Chief Executive Officer of the Company
stating that in the good faith

                                       7

<PAGE>

judgment of the Board of Directors of the Company, it would be seriously
detrimental to the business of the Company for such Form S-3 Registration to be
effected at such time, in which event the Company shall have the right to defer
the filing of the Form S-3 registration statement no more than once during any
twelve month period for a period of not more than 120 days after receipt of the
request of the Holder or Holders under this Section 2.4; provided, that, if the
Company shall so delay the filing of a registration statement, it shall promptly
notify the applicable Holders of such determination, and such Holders shall have
the right to withdraw the relevant request for registration, in which case such
registration shall not count towards the limit set forth in Section 2.4(b)(iv);

                    (iv)  if the Company has, within the twelve (12) month
period preceding the date of such request, already effected two (2)
registrations on Form S-3 for the Holders pursuant to this Section 2.4; or

                    (v)  in any particular jurisdiction in which the Company
would be required to qualify to do business or to execute a general consent to
service of process in effecting such registration, qualification or compliance.

Subject to the foregoing, the Company shall file a Form S-3 registration
statement covering the Registrable Securities and other securities so requested
to be registered pursuant to this Section 2.4 as soon as practicable, and in any
event no later than ninety (90) days, after receipt of the request or requests
of the Holders for such registration.

               (c)  Expenses. The Company shall pay all expenses incurred in
connection with the first registration requested pursuant to this Section 2.4 in
any given twelve-month period (excluding underwriters' or brokers' discounts and
commissions), including without limitation all filing, registration and
qualification, printers' and accounting fees and the reasonable fees and
disbursements of one (1) counsel for selling Holder or Holders and counsel for
the Company. For each registration for which the Company is obligated to pay
expenses pursuant to the preceding sentence, each Holder participating in such
registration shall bear such Holder's proportionate share (based on the number
of shares sold by such Holder over the total number of shares included in such
registration at the time it goes effective) of all discounts, commissions or
other amounts payable to underwriters or brokers in connection with such
offering. For each registration required pursuant to this Section 2.4 for which
the Company is not obligated to pay expenses pursuant to the first sentence of
this paragraph, all expenses incurred in connection with such registration shall
be borne by the Holders who participate in such registration on a pro rata
basis, and by the Company on a pro rata basis if it includes shares in such
registration, according to the number of Registrable Securities then owned by
the Holders and the number of shares offered by the Company that are included in
such registration at the time of its effectiveness.

               (d)  Not Demand Registration. Form S-3 registrations shall not be
deemed to be demand registrations as described in Section 2.2 above.

                                       8

<PAGE>

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

               (a)  Prepare and file with the SEC a registration statement with
respect to such Registrable Securities and use its best efforts to cause such
registration statement to become effective, and, upon the request of the Holders
of a majority of the Registrable Securities registered thereunder, keep such
registration statement effective for at least one hundred eighty (180) days.

               (b)  Prepare and file with the SEC such amendments and
supplements to such registration statement and the prospectus used in connection
with such registration statement as may be necessary to comply with the
provisions of the 1933 Act with respect to the disposition of all securities
covered by such registration statement.

               (c)  Furnish to the Holders such number of copies of a
prospectus, including a preliminary prospectus, in conformity with the
requirements of the 1933 Act, and such other documents as they may reasonably
request in order to facilitate the disposition of the Registrable Securities
owned by them that are included in such registration.

               (d)  Use its best efforts to register and qualify the securities
covered by such registration statement under such other securities or Blue Sky
laws of such jurisdictions as shall be reasonably requested by the Holders,
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.

               (e)  In the event of any underwritten public offering, enter into
and perform its obligations under an underwriting agreement, in usual and
customary form, with the managing underwriter(s) of such offering. Each Holder
participating in such underwriting shall also enter into and perform its
obligations under such an agreement.

               (f)  Notify each Holder of Registrable Securities covered by such
registration statement at any time when a prospectus relating thereto is
required to be delivered under the 1933 Act of the happening of any event as a
result of which the prospectus included in such registration statement, as then
in effect, includes an untrue statement of a material fact or omits to state a
material fact required to be stated therein or necessary to make the statements
therein not misleading in the light of the circumstances then existing.

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

                                       9

<PAGE>

any, and to the Holders requesting registration of Registrable Securities and
(ii) a "comfort" letter dated as of such date, from the independent certified
public accountants of the Company, in form and substance as is customarily given
by independent certified public accountants to underwriters in an underwritten
public offering and reasonably satisfactory to a majority in interest of the
Holders requesting registration, addressed to the underwriters, if any, and to
the Holders requesting registration of Registrable Securities.

          2.6  Furnish Information. It shall be a condition precedent to the
obligations of the Company to take any action pursuant to Sections 2.2, 2.3 or
2.4 that the selling Holders shall furnish to the Company such information
regarding themselves and the Registrable Securities held by them, and the
intended method of disposition of such securities as shall be required to timely
effect the registration of their Registrable Securities.

          2.7  Delay of Registration. No Holder shall have any right to obtain
or seek an injunction restraining or otherwise delaying any such registration as
the result of any controversy that might arise with respect to the
interpretation or implementation of this Section 2.

          2.8  Indemnification. In the event any Registrable Securities are
included in a registration statement under Sections 2.2, 2.3 or 2.4:

               (a)  By the Company. To the extent permitted by law, the Company
will indemnify and hold harmless each Holder, the partners, officers and
directors of each Holder, any underwriter (as defined in the 1933 Act) for such
Holder, each of their respective representatives and agents and such Holder's
legal counsel and independent accountants, and each person, if any, who controls
such Holder or underwriter within the meaning of the 1933 Act or the 1934 Act,
against any and all losses, claims, damages, or liabilities to which they may
become subject under the 1933 Act, the l934 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 of the following statements,
omissions or violations (each of the following being a "Violation"):

                   (i)   any untrue statement or alleged untrue statement of a
material fact contained in such registration statement, including any
preliminary prospectus or final prospectus contained therein, offering circular,
or other document or any amendments or supplements thereto incident to any such
registration, qualification or compliance;

                    (ii)  the omission or alleged omission to state therein a
material fact required to be stated therein, or necessary to make the statements
therein not misleading, or

                    (iii)  any violation or alleged violation by the Company of
the 1933 Act, the 1934 Act, any federal or state securities law or any rule or
regulation promulgated under the 1933 Act, the 1934 Act or any federal or state
securities law in connection with any action or inaction by the Company in
connection with the offering covered by such registration statement;

                                       10

<PAGE>

and the Company will reimburse each such Holder, partner, officer or director,
each of their respective representatives and agents and such Holder's legal
counsel and independent accountants, underwriter or controlling person for any
legal or other expenses reasonably incurred by them, as incurred, in connection
with investigating, preparing or defending any such loss, claim, damage,
liability or action; provided however, that the indemnity agreement contained in
this subsection 2.8(a) 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 or
delayed), nor shall the Company be liable in any such case for any such loss,
claim, damage, liability or action to the extent that it arises out of or is
based upon a Violation which occurs in reliance upon and in conformity with
written information furnished expressly for use in connection with such
registration by such Holder, partner, officer, director, underwriter or
controlling person of such Holder.

               (b)  By Selling Holders. To the extent permitted by law, each
selling Holder, severally but not jointly, if Registrable Securities held by
such Holder are included in the securities as to which such registration,
qualification or compliance is being effected, will indemnify and hold harmless
the Company, each of its directors, each of its officers who have signed the
registration statement, each person, if any, who controls the Company within the
meaning of the 1933 Act, any underwriter and any other Holder selling securities
under such registration statement or any of such other Holder's partners,
directors or officers, each of their respective representatives and agents and
such Holder's legal counsel and independent accountants, or any person who
controls such Holder within the meaning of the 1933 Act or the 1934 Act, against
any losses, claims, damages or liabilities (joint or several) to which the
Company or any such director, officer, controlling person, underwriter or other
such Holder, partner or director, officer or controlling person of such other
Holder may become subject under the 1933 Act, the 1934 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 Violation under subsection
2.8(a)(i) or (ii), in each case to the extent (and only to the extent) that such
Violation under subsection 2.8(a)(i) or (ii) occurs in reliance upon and in
conformity with written information furnished by such Holder expressly for use
in connection with such registration; and each such Holder will reimburse any
legal or other expenses reasonably incurred by the Company or any such director,
officer, controlling person, underwriter or other Holder, partner, officer,
director or controlling person of such other Holder in connection with
investigating or defending any such loss, claim, damage, liability or action;
provided, however, that the indemnity agreement contained in this subsection
2.8(b) 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 Holder, which consent shall not be unreasonably withheld; and provided
further, that the total amounts payable in indemnity by a Holder under this
Section 2.8(b) in respect of any Violation under subsection 2.8(a)(i) or (ii)
shall not exceed the net proceeds received by such Holder in the registered
offering out of which such Violation under subsection 2.8(a)(i) or (ii) arises.

               (c)  Notice. Promptly after receipt by an indemnified party under
this Section 2.8 of notice of the commencement of any action (including any
governmental action), such indemnified party will, if a claim in respect thereof
is to be made against any indemnifying party under this Section 2.8, deliver to
the indemnifying party a written notice of the

                                       11

<PAGE>

commencement thereof and the indemnifying party shall have the right to
participate in, and, to the extent the indemnifying party so desires, jointly
with any other indemnifying party similarly noticed, to assume the defense
thereof with counsel mutually satisfactory to the parties; provided, however,
that an indemnified party shall have the right to retain its own counsel, with
the fees and expenses to be paid by the indemnifying party, if representation
of such indemnified party by the counsel retained by the indemnifying party
would be inappropriate due to actual or potential conflict of interests between
such indemnified party and any other party represented by such counsel in such
proceeding. The failure of any indemnified party to deliver written notice to
the indemnifying party within a reasonable time of the commencement of any such
action, only if such failure is prejudicial to its ability to defend such
action, shall relieve such indemnifying party of any liability to the
indemnified party under this Section 2.8, but the omission so to deliver
written notice to the indemnifying party will not relieve it of any liability
that it may have to any indemnified party otherwise than under this Section 2.8.
No indemnifying party, in the defense of any such claim or litigation, shall,
except with the consent of each indemnified party, consent to entry of any
judgment or enter into any settlement which does not include as an
unconditional term thereof the giving by the claimant or plaintiff to such
indemnified party of a release from all liability in respect of such claim or
litigation.

               (d)  Defect Eliminated in Final Prospectus. The foregoing
indemnity agreements of the Company and Holders are subject to the condition
that, insofar as they relate to any Violation made in a preliminary prospectus
but eliminated or remedied in the amended prospectus on file with the SEC at the
time the registration statement in question becomes effective or the amended
prospectus filed with the SEC pursuant to SEC Rule 424(b) (the "Final
Prospectus"), such indemnity agreement shall not inure to the benefit of any
person if a copy of the Final Prospectus was furnished to the indemnified party
and was not furnished to the person asserting the loss, liability, claim or
damage at or prior to the time such action is required by the 1933 Act.

               (e)  Contribution. In order to provide for just and equitable
contribution to joint liability under the 1933 Act in any case in which either
(i) any Holder exercising rights under this Agreement, or any controlling person
of any such Holder, makes a claim for indemnification pursuant to this Section
2.8 but it is judicially determined (by the entry of a final judgment or decree
by a court of competent jurisdiction and the expiration of time to appeal or the
denial of the last right of appeal) that such indemnification may not be
enforced in such case notwithstanding the fact that this Section 2.8 provides
for indemnification in such case, or (ii) contribution may be required on the
part of the Company and any such selling Holder or any such controlling person
in circumstances for which indemnification is provided under this Section 2.8;
then, and in each such case, such indemnifying party will contribute to the
aggregate losses, claims, damages or liabilities to which they may be subject
(after contribution from others) (i) in such proportion so that such Holder is
responsible for the portion represented by the percentage that the public
offering price of its Registrable Securities offered by and sold under the
registration statement bears to the public offering price of all securities
offered by and sold under such registration statement, and the Company and other
selling Holders are responsible for the remaining portion or (ii) if the
allocation provided by clause (i) above is not permitted by applicable law, in
such proportion as is appropriate to reflect not only the relative benefits
referred to in clause (i) above but also the relative fault of the Company and
the Holders in

                                       12

<PAGE>

connection with the statements or omissions that resulted in such losses,
claims, damages or liabilities, as well as any other relevant equitable
considerations. The relative fault of the Company and of the Holders shall be
determined by reference to, among other things, whether the untrue or alleged
untrue statement of a material fact or the omission or alleged omission to state
a material fact relates to information supplied by the Company or by the Holders
and the parties' relative intent, knowledge, access to information and
opportunity to correct or prevent such statement or omission. The Holders'
respective obligations to contribute pursuant to this Section are several in
proportion to the respective number of Registrable Securities they sell, and not
joint. No such Holder will be required to contribute any amount in excess of the
public offering price of all such Registrable Securities offered and sold by
such Holder pursuant to such registration statement; and no person or entity
guilty of fraudulent misrepresentation (within the meaning of Section 11(f) of
the 1933 Act) will be entitled to contribution from any person or entity who was
not guilty of such fraudulent misrepresentation.

                (f)  Survival. The obligations of the Company and Holders under
this Section 2.8 shall survive the completion of any offering of Registrable
Securities in a registration statement, and otherwise.

           2.9  "Market Stand-Off" Agreement. Each Holder hereby agrees that it
shall not, to the extent requested by the Company or an underwriter of
securities of the Company, sell or otherwise transfer or dispose of any
Registrable Securities or other shares of stock of the Company then owned by
such Holder (other than to donees or partners of the Holder who agree to be
similarly bound) for up to one hundred eighty (180) days following the effective
date of a registration statement of the Company filed under the 1933 Act;
provided, however, that:

                (a)  such agreement shall be applicable only to the first such
registration statement of the Company which covers securities to be sold on its
behalf to the public in an underwritten offering but not to Registrable
Securities sold pursuant to such registration statement;

                (b)  all executive officers, directors and one percent
stockholders of the Company then holding Common Stock of the Company enter into
similar agreements; and

                (c)  any release of securities of the Company held by an
executive officer, director, one percent stockholder or Holder from such
agreement shall be effected between all executive officers, directors, one
percent stockholders and Holders on a pro rata basis according to the number of
shares of the Company's Common Stock then held by them.

           In order to enforce the foregoing covenant, the Company shall have
the right to place restrictive legends, substantially in the form set forth in
Section 5.3, on the certificates representing the shares subject to this Section
and to impose stop transfer instructions with respect to the Registrable
Securities and such other shares of stock of each Holder (and the shares or
securities of every other person subject to the foregoing restriction) until the
end of such period at which time the Company will, promptly upon request,
provide instructions to its transfer agent regarding the expiration of this
legend restriction.

                                       13

<PAGE>

          2.10 Rule 144 Reporting. With a view to making available the benefits
of certain rules and regulations of the Commission which may at any time permit
the sale of the Registrable Securities to the public without registration, after
such time as a public market exists for the Common Stock of the Company, the
Company agrees to:

               (a)  Make and keep public information available, as those terms
are understood and defined in Rule 144 under the 1933 Act, at all times after
the effective date of the first registration under the 1933 Act filed by the
Company for an offering of its securities to the general public;

               (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 1933
Act and the 1934 Act (at any time after it has become subject to such reporting
requirements); and

               (c) So long as a Holder owns any Registrable Securities, to
furnish to the Holder forthwith upon request a written statement by the Company
as to its compliance with the reporting requirements of said Rule 144 (at any
time after 90 days after the effective date of the first registration statement
filed by the Company for an offering of its securities to the general public),
and of the 1933 Act and the 1934 Act (at any time after it has become subject to
the reporting requirements of the 1934 Act), a copy of the most recent annual or
quarterly report of the Company, and such other reports and documents of the
Company as a Holder may reasonably request in availing itself of any rule or
regulation of the Commission allowing a Holder to sell any such securities
without registration (at any time after the Company has become subject to the
reporting requirements of the 1934 Act).

          2.11 Termination of the Company's Obligations. The Company shall have
no obligations pursuant to Sections 2.2 through 2.4 with respect to: (a) any
request or requests for registration made by any Holder on a date more than five
(5) years after the first sale of the Common Stock to the public pursuant to an
effective registration statement filed by the Company under the 1933 Act,
provided that the Company is and continues to be subject to the reporting
requirements of the 1934 Act after such public offering; or (b) any Registrable
Securities proposed to be sold by a Holder in a registration pursuant to Section
2.2, 2.3 or 2.4 if, in the opinion of counsel to the Company, all such
Registrable Securities proposed to be sold by a Holder may be sold in a
three-month period without registration under the 1933 Act pursuant to Rule 144
under the 1933 Act.

     3.   RIGHT OF FIRST REFUSAL.

          3.1  General. Each Holder (as defined in Section 2.1(d)) owning not
less than 120,000 shares of either (i) Series A Stock, (ii) Series B Stock,
(iii) Series C Stock, (iv) Series D Stock, (v) Series E Stock or (vi) Series F
Stock and any party to whom such Holder's rights under this Section 3 have been
duly assigned in accordance with Section 4.1(b) (each such Holder or assignee
being hereinafter referred to as a "Rights Holder") has the right of first
refusal to purchase such Rights Holder's Pro Rata Share (as defined below), of
all (or any part) of any "New Securities" (as defined in Section 3.2) that the
Company may from time to time issue after the date of this Agreement; provided,
however, that such Rights Holder shall have no right

                                       14

<PAGE>

to purchase any such New Securities if such Rights Holder cannot demonstrate to
the Company's reasonable satisfaction that such Rights Holder is at the time of
the proposed issuance of New Securities an "accredited investor" as such term is
defined in Regulation D under the 1933 Act. A Rights Holder's "Pro Rata Share"
for purposes of this right of first refusal is the ratio of (a) the number of
Registrable Securities as to which such Rights Holder is the Holder (and/or is
deemed to be the Holder under Section 2.1(d)), to (b) a number of shares of
Common Stock of the Company equal to the sum of (i) the total number of shares
of Common Stock of the Company then outstanding plus (ii) the total number of
shares of Common Stock of the Company into which all then outstanding shares of
Preferred Stock of the Company are then convertible, plus (iii) the number of
shares of Common Stock of the Company reserved for issuance under any stock
purchase and stock option plans of the Company approved by the Company's Board
of Directors and outstanding warrants.

          3.2  New Securities. "New Securities" shall mean any capital stock of
the Company, whether now authorized or not, and rights, options or warrants to
purchase such capital stock, and securities of any type whatsoever that are, or
may become, convertible or exchangeable into such capital stock; provided,
however, that the term "New Securities" does not include:

               (i) any shares of the Company's Common Stock (and/or options or
warrants therefor) granted or issued to employees, officers, outside directors,
or consultants of the Company pursuant to written incentive agreements or plans
approved by the Board of Directors of the Company;

               (ii) any securities issuable upon conversion of or with respect
to any then outstanding shares of Series A Stock, Series B Stock, Series C
Stock, Series D Stock, Series E Stock, or Series F Stock or Common Stock or
other securities issuable upon conversion thereof;

               (iii) any securities issuable upon exercise of any options,
warrants or rights to purchase any securities of the Company outstanding on the
date of this Agreement and any securities issuable upon the conversion of any
such option, warrant or right;

               (iv)  shares of the Company's capital stock issued in connection
with any stock split or stock dividend or recapitalization;

               (v)   securities offered by the Company to the public pursuant to
a registration statement filed under the 1933 Act;

               (vi)  up to 600,000 shares of the Company's Common Stock and
Preferred Stock (and/or options or warrants therefor) issued or issuable to
parties providing the Company with equipment leases, real property leases,
loans, credit lines, guaranties of indebtedness, cash price reductions or
similar financing;

               (vii) up to 4,000,000 shares of capital stock issued pursuant to
the consolidation, merger, purchase of all or substantially all of the assets,
or other reorganization in

                                       15

<PAGE>

which the Company acquires, in a single transaction or series of related
transactions, all or substantially all of the assets of such other corporation
or entity or more than fifty percent (50%) or more of the voting power of such
other corporation or entity or more than fifty percent (50%) or more of the
equity ownership of such other entity; or

               (viii)  any shares of Series F Stock issued under the Series F
Agreement as such agreement may be amended.

          3.3  Procedures. In the event that the Company proposes to undertake
an issuance of New Securities, it shall give to each Rights Holder written
notice of its intention to issue New Securities (the "Notice"), describing the
type of New Securities and the price and the general terms upon which the
Company proposes to issue such New Securities. Each Rights Holder shall have
twenty (20) days from the date of mailing of any such Notice to elect in writing
to purchase such Rights Holder's Pro Rata Share of such New Securities for the
price and upon the general terms specified in the Notice by giving written
notice to the Company and stating therein the quantity of New Securities to be
purchased (not to exceed such Rights Holder's Pro Rata Share). If any Rights
Holder fails to so elect in writing within such twenty (20) day period to
purchase such Rights Holder's full Pro Rata Share of New Securities (a
"Nonpurchasing Holder"), then such Nonpurchasing Holder shall forfeit the right
hereunder to purchase that part of his Pro Rata Share of such New Securities
that he did not so agree to purchase and the Company shall promptly give each
Rights Holder who has timely elected to purchase his full Pro Rata Share of such
New Securities (a "Purchasing Holder") written notice of the failure of any
Nonpurchasing Holder to purchase such Nonpurchasing Rights Holder's full Pro
Rata Share of such offering of New Securities (the "Overallotment Notice"). Each
Purchasing Holder shall have a right of overallotment such that such Purchasing
Holder may agree to purchase a portion of the Nonpurchasing Holders' unpurchased
Pro Rata Shares of such offering on a pro rata basis according to the relative
Pro Rata Shares of the Purchasing Rights Holders, at any time within ten (10)
days after receiving the Overallotment Notice. If any Rights Holder notifies the
Company of its election to purchase such New Securities within such time period,
a closing with respect to such purchase shall be held at the principal office of
the Company (or at such other place as may be agreed upon by the Company and the
Rights Holder) on a date and at a time which are mutually agreeable to the
Company and such Rights Holder, but in no event later than the later to occur of
(a) sixty (60) days after receipt by the Company of such notice of the Rights
Holder's election and (b) ten (10) days after the receipt of any governmental
consent or approval necessary for the consummation of such transaction.

          3.4  Failure to Exercise. In the event that the Rights Holders fail to
exercise in full the right of first refusal within such twenty (20) plus ten
(10) day period, then the Company shall have ninety (90) days thereafter to sell
the New Securities with respect to which the Rights Holders' rights of first
refusal hereunder were not exercised, at a price and upon the same material
terms as specified in the Company's Notice to the Rights Holders. In the event
that the Company has not issued and sold the New Securities within such ninety
(90) day period, or offers to sell a lesser number of shares than specified in
such Notice, then the Company shall not thereafter issue or sell any New
Securities without again first offering such New Securities to the Rights
Holders pursuant to this Section 3.

                                       16

<PAGE>

          3.5 Termination. This right of first refusal shall terminate
immediately prior to the first to occur of: (a) the closing of the first sale of
Common Stock to the public pursuant to an effective registration statement filed
by the Company under the 1933 Act, (b) any reorganization, consolidation, merger
or similar transaction or series of related transactions (each, a "combination
transaction")) in which the Corporation is a constituent corporation or is a
party if, as a result of such combination transaction, the voting securities of
the Corporation that are outstanding immediately prior to the consummation of
such combination transaction (other than any such securities that are held by an
"Acquiring Stockholder", as defined below) do not represent, or are not
converted into, securities of the surviving corporation of such combination
transaction (or such surviving corporation's parent corporation if the surviving
corporation is owned by the parent corporation) that, immediately after the
consummation of such combination transaction, together possess at least a
majority of the total voting power of all securities of such surviving
corporation (or its parent corporation, if applicable) that are outstanding
immediately after the consummation of such combination transaction; and (c) a
sale of all or substantially all of the assets of the Corporation. For purposes
of this Section 3.5, an "Acquiring Stockholder" means a stockholder or
stockholders of the Company that (i) merges or combines with the Company in such
combination transaction or (ii) owns or controls a majority of another
corporation that merges or combines with the Company in such combination
transaction.

     4.   ASSIGNMENT AND AMENDMENT.

          4.1  Assignment. Notwithstanding anything herein to the contrary:

               (a)  Information Rights. The rights of an Investor under
Section 1.1 or 1.2 hereof may be assigned only to a party who acquires from an
Investor (or an Investor's permitted assigns) at least that number of shares of
Series A Stock, Series B Stock, Series C Stock, Series D, Series E Stock, and/or
Series F Stock and/or an equivalent number (on an as-converted basis) of shares
of Conversion Stock necessary to hold the rights described in Section 1.1 or 1.2
hereof, respectively.

               (b)  Registration Rights; Refusal Rights. The registration rights
of a Holder under Section 2 hereof and the rights of first refusal of a Rights
Holder under Section 3 hereof may be assigned only to an affiliate or a party
who acquires at least 120,000 shares of Series A Stock issued under the Series A
Agreement, 120,000 shares of Series B Stock issued under the Series B Agreement,
120,000 shares of Series C Stock issued under the Series C Agreement, 120,000
shares of Series D Stock issued under the Series D Agreement, 120,000 shares of
Series E Stock issued under the Series E Agreement, or 120,000 shares of Series
F Stock issued under the Series F Agreement or an equivalent number (on an
as-converted basis) of Registrable Securities issued upon conversion thereof;
provided, however that no party may be assigned any of the foregoing rights
unless the Company is given written notice by the assigning party at the time of
such assignment stating the name and address of the assignee and identifying the
securities of the Company as to which the rights in question are being assigned;
and provided further that any such assignee shall receive such assigned rights
subject to all the terms and conditions of this Agreement, including without
limitation the provisions of this Section 4.

                                       17

<PAGE>

               (c)  Aggregation. Shares of capital stock of the Company owned by
Investors, Holders and Rights Holders which are partnerships, limited liability
companies, corporations and other entities having substantially common ownership
interests or managed by the same principals or investment advisors or owned by
individual Investors affiliated with one another ("Affiliated Investors") shall
be aggregated for the purposes of this Agreement, and, notwithstanding anything
to the contrary contained in this Agreement, all rights granted to the
Investors, Holders and Rights Holders pursuant to this Agreement may be assigned
between Affiliated Investors. Without limiting the generality of the foregoing,
for purposes of this Section 4.1(c), (i) Spectrum Equity Investors IV, L.P. and
Spectrum IV Investment Managers' Fund, L.P. shall be deemed to be Affiliated
Investors, and (ii) Scudder Technology Innovation Fund and Scudder Technology
Fund shall be deemed to be Affiliated Investors.

          4.2  Amendment of Rights. Any provision of this Agreement may be
amended and the observance thereof may be waived (either generally or in a
particular instance and either retroactively or prospectively), only with the
written consent of the Company and Investors (and/or any of their permitted
successors or assigns) holding shares of Series A Stock, Series B Stock, Series
C Stock, Series D Stock, Series E Stock, and/or Series F Stock and/or Conversion
Stock representing and/or convertible into a majority of all the Investors'
Shares (as defined below); provided, however, that any amendment that directly
or indirectly (together with any transaction entered into in connection
therewith) treats any Holder or Holders in an adverse manner that is different
than any other Holders will require the approval of the Holders of a majority of
the Investors' Shares then held by such adversely treated Holders.
Notwithstanding the foregoing, the provisions of Section 5.7 may be amended and
the observance thereof may be waived (either generally or in a particular
instance and either retroactively or prospectively) only with the written
consent of GE Capital or its permitted assignee of the rights under Section 5.7
(without the need of written consent of any party other than the Company). As
used herein, the term "Investors' Shares" shall mean the shares of Common Stock
then issuable upon conversion of all then outstanding shares of Series A Stock,
shares of Series B Stock, shares of Series C Stock, shares of Series D Stock,
shares of Series E Stock, shares of Series F Stock, in each case held by
Investors and permitted assigns, plus all then outstanding shares of Conversion
Stock that were issued upon the conversion of any shares of Series A Stock
issued under the Series A Agreement, shares of Series B Stock issued under the
Series B Agreement, shares of Series C Stock issued under the Series C
Agreement, shares of Series D Stock issued under the Series D Agreement, shares
of Series E Stock issued under the Series E Agreement, or shares of Series F
Stock issued under the Series F Agreement, respectively, in each case held by
Investors and permitted assigns. Any amendment or waiver effected in accordance
with this Section 4.2 shall be binding upon each Investor, each Holder, each
Rights Holder, each permitted successor or assignee of such Investor or Holder
or Rights Holder and the Company.

          4.3  New Investors. Notwithstanding anything herein to the contrary,
if pursuant to Section 2.2 of the Series F Agreement, additional parties may
purchase shares of Series F Stock as "Investors" thereunder, then each such
Investor shall become a party to this Agreement as an "Investor" hereunder,
without the need of obtaining any consent, approval or signature of any Investor
when such Investor has both: (a) purchased shares of Series F Stock under the
Series F Agreement and paid the Company all consideration payable for such
shares

                                       18

<PAGE>

and (b) executed one or more counterpart signature pages to this Agreement as an
"Investor," with the Company's consent.

     5.   COVENANTS OF THE COMPANY
          ------------------------

          5.1  Reservation of Common Stock. The Company will at all times
reserve and keep available a sufficient number of shares of Common Stock for
issuance and delivery upon the conversion of the Series A Stock, Series B Stock,
Series C Stock, Series D Stock, Series E Stock and Series F Stock.

          5.2  Stock Vesting. All Common Stock issuances, stock options and
other stock equivalents granted or issued after the date of this Agreement to
employees, directors, consultants and other service providers, shall be made
from time to time under contracts, plans or other arrangements as recommended by
management and approved by the Company's Board of Directors and unless otherwise
approved by the Board of Directors, shall be subject to vesting as follows: (a)
twenty-five percent (25%) of such stock shall vest at the end of the first year
following the earlier of the date of grant or the commencement date of such
person's service with the Company, and (b) seventy-five percent (75%) of such
stock shall vest over the following three (3) years. With respect to any shares
of stock purchased by any such person, the Company's repurchase option shall
provide that upon such person's termination of employment or service with the
Company, with or without cause, the Company or its assignee (to the extent
permissible under applicable securities laws and other laws) shall have the
option to purchase at cost any unvested shares of stock held by such person.

          5.3  Legend. Each certificate representing Registrable Securities or
Preferred Stock convertible into Registrable Securities shall be stamped or
otherwise imprinted with a legend in the following form (in addition to any
legend required under applicable state securities laws):

     THE SHARES REPRESENTED BY THIS CERTIFICATE ARE SUBJECT TO A MARKET STANDOFF
     AGREEMENT PURSUANT TO AN AGREEMENT BETWEEN THE ISSUER, THE REGISTERED
     HOLDER AND CERTAIN OTHER PARTIES. COPIES OF THE AGREEMENT RESTRICTING THEIR
     TRANSFER MAY BE OBTAINED AT NO COST BY WRITTEN REQUEST MADE BY THE HOLDER
     OF RECORD OF THIS CERTIFICATE TO THE SECRETARY OF THE CORPORATION AT THE
     PRINCIPAL EXECUTIVE OFFICES OF THE CORPORATION.

          5.4  Proprietary Information Agreements. The Company shall require the
execution of an Invention Assignment and Confidentiality Agreement, in the form
approved from time to time by the Company's Board of Directors, or a
substantially similar agreement, as a condition to hire for any officer,
director, employee, consultant, agent or contractor of the Company after the
date of this Agreement.

                                       19

<PAGE>

          5.5  Limitations on Subsequent Registration Rights. From and after the
date of this Agreement, the Company shall not, without the prior written consent
of Holder(s) of at least two-thirds (2/3) of the Registrable Securities then
outstanding, enter into any agreement with any holder or prospective holder of
any securities of the Company giving such holder or prospective holder any
registration rights the terms of which are equal to or more favorable than the
registration rights granted to Holders hereunder or requiring the Company to
effect a registration earlier than the date on which Holders can first require a
registration under Section 2.2; provided, however, that if such new agreement
does not affect all series of Preferred Stock in substantially the same manner,
approval must be obtained by majority vote of each series of Preferred Stock not
so affected.

          5.6  Directors' and Officers' Insurance. As soon as reasonably
possible, but in no event more than ninety (90) days after the date on which the
first share of Series F Stock is issued, the Company shall obtain and at all
times thereafter shall maintain in full force and effect, with financially sound
and reputable insurance companies, directors' and officers' insurance for a
coverage amount of at least $3,000,000 per occurrence on terms and conditions
that are approved by the Board; provided, however, that the Company shall not be
obligated by this Section 5.7 during such periods as the Board determines that
maintaining such coverage would be commercially unreasonable

          5.7  Attendance at Board Meetings.

               (a)  Board Observer Rights. For so long as General Electric
Capital Equity Investments, Inc. ("GE Capital") holds no less than 50% (fifty
percent) of the shares of the Series F Stock purchased by GE Capital pursuant to
the Series F Agreement and/or shares of Common Stock issued upon conversion
thereof, the Company will permit one representative of GE Capital to attend all
meetings of (i) Board and (ii) any executive or similar committee of the Board
and any other committee of the Board that the Board determines (from time to
time) is appropriate for attendance of such representative (any such committee,
a "Covered Committee"), in each case in a non-voting observer capacity;
provided, however, that such representative is subject to the approval by the
Board, such approval not to be unreasonably withheld; provided, further, that
any such representative must be an employee of GE Capital or its affiliates (or
an employee of any permitted assignee GE Capital of the rights under this
Section 5.8); and, provided, further, that the Company reserves the right not to
provide information and to exclude such representative from any meeting or
portion thereof if, in the Board's judgment, GE Capital or its representative
has a demonstrable conflict of interest with respect to the issue to be
discussed or the presence of the representative could jeopardize the Company's
attorney-client privilege. The Company agrees to provide GE Capital and any such
designated representative notice of all Board and Covered Committee meetings
contemporaneous with the giving of such notice, and in the same manner as such
notice is given, to members of the Board or the Covered Committee and, subject
to the last proviso in the foregoing sentence, to provide GE Capital and such
representative all information provided to members of the Board or Covered
Committee contemporaneous with providing such information to such members.

                                       20

<PAGE>

               (b)  Confidentiality. GE Capital agrees for a period of two years
from receipt of Confidential Information (i) to hold in strict confidence and to
act in a fiduciary manner with respect to all information and materials that it
may receive, or be given access to, in connection with meetings of the Board and
Covered Committees ("Confidential Information"), (ii) not to disclose any
Confidential Information to any third party, and (ii) not to use any
Confidential Information for any purpose detrimental to, or that may adversely
affect, the Company. GE Capital may disclose Confidential Information to GE
Capital's responsible employees, directors and/or officers and GE Capital's
lawyers, accountants and/or auditors with a bona fide need to know, and then
only to the extent necessary, and GE Capital agrees to instruct each such party
regarding the use and disclosure restrictions applicable to such Confidential
Information. GE Capital agrees to use its best efforts to cause its
representative to agree in writing to be similarly bound.

               (c)  Expenses. The Company shall reimburse all reasonable, direct
out-of-pocket travel, food and lodging expenses incurred by the GE Capital
representative in connection with his or her attendance of meetings of the Board
and any Covered Committee.

               (d)  Assignment. The rights described in this Section 5.7 may be
assigned only to a party who acquires from GE Capital no less than 50% (fifty
percent) of the shares of Series F Stock purchased by GE Capital pursuant to the
Series F Agreement; provided, however, that such rights may not be assigned to a
competitor of the Company (as determined by the Board in good faith); provided,
further, that no party may be assigned the foregoing rights unless the Company
is given the name and address of the assignee; provided, further, that, as a
condition precedent to acquiring such shares and the rights granted under this
Section 5.7, any such assignee shall be required first to agree in writing to be
bound by all the terms and conditions of this Section 5.7 and any representative
of such assignee shall similarly agree in writing.

          5.8  Assignment of Right of First Refusal. In the event that any
person or entity that is a "Stockholder" party to either that certain Second
Amended and Restated Co-Sale Agreement dated May 21, 1998, by and between the
Company and certain of its stockholders, or that certain Management Co-Sale
Agreement dated as of even date herewith, by and between the Company and certain
of its stockholders, as such agreements may be amended hereafter, proposes to
transfer shares of the Company's Common Stock that are subject to the Company's
right of first refusal under a restricted stock purchase agreement, stock option
exercise agreement, or similar agreement (each, a "Restricted Stock Agreement"),
then if the Company does not exercise such right of first refusal in full, the
Company shall give notice to the Rights Holders of such proposed disposition by
the selling Stockholder, including the terms thereof set forth in the selling
Stockholder's notice to the Company pursuant to the relevant Restricted Stock
Agreement, and specifying the number of shares that the Company will not acquire
(the "Remaining Shares") no later than ten (10) days after the Company's receipt
of notice of the proposed disposition from the selling Stockholder. Each Rights
Holder shall have seven (7) days after giving of such notice to give written
notice to the Company specifying the number of Remaining Shares that such Rights
Holder will acquire. The Company shall assign to each subscribing Rights Holder
such Rights Holder's Pro Rata Share of the unexercised portion of the

                                       21

<PAGE>

Company's right of first refusal. A Rights Holder's "Pro Rata Share" will be
determined by multiplying the number of Remaining Shares multiplied by a
fraction, the numerator of which is the number of shares of capital stock held
by the Rights Holder (determined on an as-converted to Common Stock basis), and
the denominator is the total number of shares of capital stock then held by all
Rights Holders (determined on an as-converted to Common Stock basis). If any
Rights Holder does not elect to purchase any shares (a "Nonpurchasing Rights
Holder"), the Company shall promptly give each Rights Holder who has timely
elected to purchase its full Pro Rata Share of Remaining Shares (a "Purchasing
Rights Holder") written notice of the failure of any Nonpurchasing Rights Holder
to purchase such Nonpurchasing Rights Holder's full Pro Rata Share of such
Remaining Shares (the "Overallotment Notice"). Each Purchasing Rights Holder
shall have a right of overallotment such that such Purchasing Rights Holder may
agree to purchase a portion of the Nonpurchasing Rights Holder's unpurchased Pro
Rata Share of such Remaining Shares on a pro rata basis according to the
relative Pro Rata Shares of the Purchasing Rights Holders, at any time within
seven (7) days after receiving the Overallotment Notice. The Company shall
assign to each subscribing Rights Holder the Company's right of first refusal
with respect to the Remaining Shares, with such assignments to be
proportionately made as set forth in this Section 5.8. Any exercise of the
assigned right of first refusal by an Investor or Investors shall be on the
terms set forth in the applicable Restricted Stock Agreement. The Company
represents and warrants to each Rights Holder that (i) the Company has the
valid, binding and enforceable right to acquire, at the Company's option, each
share of capital stock of the Company now held and proposed to be transferred by
each of the persons listed on Schedule 5.9 hereto (other than donative transfers
to family members or trusts for the benefit thereof as set forth in the
Restricted Stock Agreements), (ii) all of such rights are assignable by the
Company to the Rights Holders pursuant to this Section 5.8, (iii) the Company
has not granted any right, or otherwise entered into any agreement or
understanding, with respect to any capital stock subject to such rights that in
any respect conflicts with or impairs the rights of the Rights Holders hereunder
and (iv) upon any assignment of any such rights pursuant to this Section 5.8,
the Rights Holders will have the valid, binding and enforceable right to acquire
the shares of capital stock that are the subject of such assignment; provided,
however, that, the foregoing does not apply to the provisions of that certain
Stockholders' Agreement dated March 31, 1998, by and among the Company and
certain of its stockholders.

          5.9  Termination. The obligations of the Company under this Section 5
shall terminate immediately prior to the first to occur of: (a) the closing of
the first sale of Common Stock to the public pursuant to an effective
registration statement filed by the Company under 1933 Act provided that the
Company is subject to the reporting requirements of the Exchange Act immediately
after such closing; (b) the time at which the Company becomes subject to the
reporting requirements of the Exchange Act other than in connection with the
Company's initial public offering, (c) any reorganization, consolidation, merger
or similar transaction or series of related transactions (each, a "combination
transaction")) in which the Company is a constituent corporation or is a party
if, as a result of such combination transaction, the voting securities of the
Company that are outstanding immediately prior to the consummation of such
combination transaction (other than any such securities that are held by an
"Acquiring Stockholder", as defined below) do not represent, or are not
converted into, securities of the surviving corporation of such combination
transaction (or such surviving corporation's parent corporation if the

                                       22

<PAGE>

surviving corporation is owned by the parent corporation) that, immediately
after the consummation of such combination transaction, together possess at
least a majority of the total voting power of all securities of such surviving
corporation (or its parent corporation, if applicable) that are outstanding
immediately after the consummation of such combination transaction; and (d) a
sale of all or substantially all of the assets of the Company. For purposes of
this Section 5.9, an "Acquiring Stockholder" means a stockholder or stockholders
of the Company that (i) merges or combines with the Company in such combination
transaction or (ii) owns or controls a majority of another corporation that
merges or combines with the Company in such combination transaction

     6.   GENERAL PROVISIONS.
          ------------------

          6.1  Notices. Any and all notices required or permitted to be given to
a party pursuant to the provisions of this Agreement will be in writing and will
be effective and deemed to provide such party sufficient notice under this
Agreement on the earliest of the following: (i) at the time of personal
delivery, if delivery is in person; (ii) one (1) business day after deposit with
an express overnight courier for United States deliveries, or three (3) business
days after such deposit for deliveries outside of the United States, with proof
of delivery from the courier requested; or (iii) three (3) business days after
deposit in the United States mail by certified mail (return receipt requested)
for United States deliveries.

          All notices for delivery outside the United States will be sent by
express courier. All notices not delivered personally will be sent with postage
and/or other charges prepaid and properly addressed to the party to be notified
at the address as follows, or at such other address as such other party may
designate by one of the indicated means of notice herein to the other parties
hereto as follows:

               (a)  if to an Investor, at such Investor's respective address as
set forth on Exhibit A hereto; and

               (b)  if to the Company, marked "Attention: President", at 350
Oakmead Parkway, Sunnyvale, California 94085.

          6.2  Entire Agreement. This Agreement, together with all the Exhibits
hereto, constitutes and contains the entire agreement and understanding of the
parties with respect to the subject matter hereof and supersedes any and all
prior negotiations, correspondence, agreements, understandings, duties or
obligations between the parties respecting the subject matter hereof. Any
previous agreement between the Company and any Investor concerning Registration
rights including the Prior Rights Agreement, is superseded.

          6.3  Governing Law. This Agreement shall be governed by and construed
exclusively in accordance with the internal laws of the State of California as
applied to agreements among California residents entered into and to be
performed entirely within California, excluding that body of law relating to
conflict of laws and choice of law.

                                       23

<PAGE>

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

          6.5  Third Parties. Nothing in this Agreement, express or implied, is
intended to confer upon any person, other than the parties hereto and their
successors and assigns, any rights or remedies under or by reason of this
Agreement.

          6.6  Successors And Assigns. Subject to the provisions of Section 4.1,
the provisions of this Agreement shall inure to the benefit of, and shall be
binding upon, the successors and permitted assigns of the parties hereto.

          6.7  Captions. The captions to sections of this Agreement have been
inserted for identification and reference purposes only and shall not be used to
construe or interpret this Agreement.

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

          6.9  Costs And Attorneys' Fees. In the event that any action, suit or
other proceeding is instituted concerning or arising out of this Agreement or
any transaction contemplated hereunder, the prevailing party shall recover all
of such party's costs and attorneys' fees incurred in each such action, suit or
other proceeding, including any and all appeals or petitions therefrom.

          6.10 Adjustments for Stock Splits, Etc. Wherever in this Agreement
there is a reference to a specific number of shares of Common Stock or Preferred
Stock of the Company of any class or series, then, upon the occurrence of any
subdivision, combination or stock dividend of such class or series of stock
occurring after the date of this Agreement, the specific number of shares so
referenced in this Agreement shall automatically be proportionally adjusted to
reflect the affect on the outstanding shares of such class or series of stock by
such subdivision, combination or stock dividend.

          6.11 Approval of Amendments and Waiver of Rights of First Refusal.
Each Prior Investor hereby consents with respect to all shares of capital stock
held by such Investor to (a) the amendment and restatement of the Prior Rights
Agreement, and (b) the waiver of the Company's obligations, the notice period
and the rights of first refusal of certain Prior Investors under Section 3 of
the Prior Rights Agreement with respect to the issuance of the Series F Stock to
be issued under the Series F Agreement, as such agreement may be amended.

          6.12 Waiver of Jury Trial. Each party hereto hereby waives its rights
to a jury trial of any claim or cause of action based upon or arising out of
this Agreement or the subject matter hereof. The scope of this waiver is
intended to be all-compassing of any and all disputes that may be filed in any
court and that relate to the subject matter of this transaction, including,

                                       24

<PAGE>

without limitation, contract claims, tort claims, breach of duty claims, and all
other common law and statutory claims. This Section 6.12 has been fully
discussed by each of the parties hereto and these provisions shall not be
subject to any exceptions. Each party hereto hereby further warrants and
represents that such party has reviewed this waiver with its legal counsel, and
that such party knowingly and voluntarily waives its jury trial rights following
consultation with legal counsel. This waiver is irrevocable, meaning that it may
not be modified either orally or in writing, and this waiver shall apply to any
subsequent amendments, supplements or modifications to (or assignments of) this
Agreement. In the event of litigation, this Agreement may be filed as a written
consent to a trial (without a jury) by the court.

                  [Remainder of page intentionally left blank.]

                                       25

<PAGE>

                                   EXHIBIT A
                                   ---------

                              Schedule of Investors

Investor
--------
GE Capital Equity Investments, Inc.
120 Long Ridge Road
Stamford, CT 06977
Attention:   NetScreen Technologies, Inc.
             Account Manager; and
             General Counsel

Scudder Technology Innovation Fund
c/o Zurich Scudder Investments, Inc.
345 Park Avenue
New York, NY 10154
Attention: General Counsel

Scudder Technology Fund
c/o Zurich Scudder Investments, Inc.
345 Park Avenue
New York, NY 10154
Attention: General Counsel

Capital Guardian US Small Capitalization Fund
(Private Placement Eligible) for Tax Exempt Trusts
c/o Capital Guardian Trust Company
630 Fifth Avenue, 36th Floor
New York, NY 10111-0121
Attention: Suzanne Stewart

With a copy to:

c/o Capital Guardian Trust Company
11100 Santa Monica Blvd., 15th Floor
Los Angeles, CA 90025-3384
Attention: Mark Brubaker

<PAGE>

Capital Guardian US Small Capitalization Master
Fund (Private Placement Eligible)
c/o Capital Guardian Trust Company
630 Fifth Avenue, 36th Floor
New York, NY 10111-0121
Attention: Suzanne Stewart

With a copy to:

c/o Capital Guardian Trust Company
11100 Santa Monica Blvd., 15th Floor
Los Angeles, CA 90025-3384
Attention: Mark Brubaker

Pennsylvania Public School Employees'
Retirement System
c/o Capital Guardian Trust Company
630 Fifth Avenue, 36th Floor
New York, NY 10111-0121
Attention: Suzanne Stewart

With a copy to:

c/o Capital Guardian Trust Company
11100 Santa Monica Blvd., 15th Floor
Los Angeles, CA 90025-3384
Attention: Mark Brubaker

SMALLCAP World Fund, Inc.
c/o Capital Research and Management Company
333 South Hope Street
Los Angeles, CA 90071-1447
Attention: Mike Downer

Spectrum Equity Investors IV, L.P.
Spectrum IV Investment Managers' Fund, L.P.
Spectrum Equity Investors Parallel IV, L.P.
333 Middlefield Road, Suite 200
Menlo Park, CA 94025
Attention: Victor E. Parker

<PAGE>

Sequoia Capital VII
Sequoia Capital Franchise Fund
Sequoia Capital Franchise Partners
Sequoia Technology Partners VII
Sequoia International Partners
Sequoia 1997 LLC
SQP 1997
3000 Sand Hill Road
Bldg. 4, Suite 280
Menlo Park, CA 94025
Attention: Michael Goguen

Techgains Corporation
Techgains Pan Pacific Corporation
Techgains International Corporation
Topgrace Investments Ltd.
1111 Jupiter Rd. Suite 100B
Plano, TX 75074
Attention: Andrew Kang
Contact: Lolly Li (li@tamcfund.com)

Silicon Valley Equity Fund, L.P.
Silicon Valley Equity Fund II, L.P.
2041 Mission College Boulevard
Suite 100
Santa Clara, CA 95054
Attention: Katherine Jen

Technology Partners Venture Capital Corp.
2F-2, 130, Szu-Wei Road
Hsinchu, Taiwan

Masaharu Shinya
Global Alliance Inc.
4-5, Tsukiji 1-Chome
Chuo-ku
Tokyo, 104-0045 Japan

KJL Investment
Chiu Family Living Trust
Chiu Family Children's Trust
Chiu Family Charitable Remainder Unitrust
19163 Via Tesoro Court
Saratoga, CA 95070

<PAGE>

E92 Plus Group, PLC
St. James House
St James Road
Surbiton Surrey KTG 4QH
United Kingdom

Hitachi Seibu Software, Ltd.
Hitachi Systems & Services, Ltd.
4-16, Uchihonmachi 2-chome, Chuo-ku
Osaka, 540-0026, Japan

EICO, Inc.
1054 Yosemite Drive
Milpitas, CA 95035

PJ&K Investments Corporation
2F-2, No. 130, Szu-Wei Road
Hsinchu, Taiwan

Nahil Sifri
2250, Place Transcanadienne
Dorval, (Quebec) H9P 2X5

Congress Communications, PLC
Wilshire House 19/21 Woolmead
Farnham Surrey GU9 OSJ
United Kingdom

Netsoft Associates
2727 Walsh Ave. Suite 101
Santa Clara, CA 95051

F & W Investments LLC
Two Palo Alto Square
Palo Alto, CA 94306

SecureSoft, Inc.
9th Floor, Doosan B/D,
105-7 Nonhyun-Dong,
Kangnam-Ku, Seoul, Korea

<PAGE>

Paul Gupta
15000 Blue Gum Court
Saratoga, CA 95070

Big Basin Partners, L.P.
14585 Big Basin Way
Saratoga, CA 95070

David C. Weng Living Trust
1101 Di Napoli Drive
San Jose, CA 95129

Sumitomo Corporation Tokyo
2-2, Hitotsubashi 1Chome
Chiyoda-ku, Tokyo
100-8601, Japan
Attn. Mr. Daisuke Mikogami
with a copy to:
Sumitomo Corporation of America
600 3rd Ave.
New York, New York 10016-2001
Attn. Mr. William Fornshell

TEKKANG Management Consulting Inc.
1111 S. Sherman Street #101
Richardson, TX 75081
Attention: Andrew Kang

Thomas F. and Kathy S. Mendoza
c/o Network Appliance, Inc.
495 East Java Drive
Sunnyvale, CA 94089

Hsun Kwei Chou and Aiko Chou Trust
13211 West Sunset Drive
Los Altos Hills, CA 94022

<PAGE>

MCI WorldCom Venture Fund, Inc.
1801 Pennsylvania Ave, NW
Washington DC 20006
Attn: Susan Mayer

Ericsson Holding International B.V.
77 South Bedford St.
Burlington, Massachusetts 01803
Attn: Jeff Low

Snaiso
141 Avenue de Veroun
92130 Issy-Les-Moolineaux
France

Equinox Solutions Through Partnership Ltd.
Equinox House
25 Invincible Rd
Farnborough, Hampshire GU14 7QU

Presidio Venture Partners
2900 Patrick Henry Drive
Santa Clara CA 95054
Attn: Ike Nakamura

Juniper Networks, Inc.
1194 North Mathilda Avenue
Sunnyvale, CA 94089
ATTN: Rob Atherton

Datalink Business Solutions Ltd.
C1, 1F Phase 1,
Kaiser Estate
41 Man Yue St.
Hunghom Kowloon
Hong Kong

Cheng-FengChen

<PAGE>

7th Floor, Room 3
#21, Sec. 2 Chung King So. Rd.
Taipei, Taiwan, ROC

Deacon Family Trust
884 Santa Rita Ave.
Los Altos, CA 94022

Hongping Zhang
3615 Rue Mirassou
San Jose, CA 95148

Michael M.C. Chiu
19163 Via Tesoro Ct.
Saratoga, CA 95070

CLAS Investment
4138 Remillard Court
Pleasanton, CA 94566
Attn: Shinnan Kiang

Charles Y. Lee
1150 Lombard Street #24
San Francisco, CA 94109

Inkeun Lee
4701 NE Shore Place
Lake Forest Park, WA 98155

M. Liu Trust
1255 Post Street, Suite 840
San Francisco, CA 94109

Hien Ngoc Truong
1281 Arizona Ave.
Milpitas, CA 95035

Alex Chang
6048 Crossview Circle
San Jose, CA 95120

<PAGE>

Godfrey Fong
12291 Barley Hill Road
Los Altos Hill, CA 94022

Comdisco, Inc.
6111 North River Road
Rosemount, Illinois 60018
Attention: Venture Lease Administration
Attention: Legal Department General Counsel

GATX Ventures, Inc.
3687 Mt. Diablo Blvd., Suite 200
LaFayette, CA 94159
Attention: Patricia Leicher

Yi-Chih Hans Tai
No. 4-2 Kou-Hwa Street
Hsinchu, Taiwan

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