Document:

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                                                                     EXHIBIT 4.2

                                 FIRST AMENDMENT

                                     to the

                        PREFERRED STOCK RIGHTS AGREEMENT

                                     between

                               AVANEX CORPORATION

                                       and

                          EQUISERVE TRUST COMPANY, N.A.

         This first Amendment (the "Amendment") to the Preferred Stock Rights
Agreement is made and entered into as of March 18, 2002 between AVANEX
CORPORATION, a Delaware corporation (the "Company"), and EQUISERVE TRUST
COMPANY, N.A., a national banking association, as Rights Agent (the "Rights
Agent").

                                 R E C I T A L S

         WHEREAS, the Company and the Rights Agent entered into the Preferred
Stock Rights Agreement dated as of July 26, 2001 (the "Rights Agreement");

         WHEREAS, Section 27 of the Rights Agreement provides that, prior to the
Distribution Date (as defined in the Rights Agreement), the Company may
supplement or amend the Rights Agreement in any respect without the approval of
any holders of Rights;

         WHEREAS, the Company, Oplink Communications, Inc., a Delaware
Corporation ("Omega"), and Pearl Acquisition Corp., a Delaware corporation and a
wholly-owned subsidiary of Parent ("Merger Sub") intend to enter into an
Agreement and Plan of Reorganization (the "Reorganization Agreement") pursuant
to which, among other things, Merger Sub will merge with and into Omega (the
"Merger") and the outstanding shares of Common Stock of Omega will be converted
into shares of Common Stock of the Company, upon the terms and subject to the
conditions of the Reorganization Agreement; and

         WHEREAS, on March 18, 2002, the Board of Directors of the Company
resolved to amend the Rights Agreement to render the Rights inapplicable to the
Merger and the other transactions contemplated by the Reorganization Agreement.

         WHEREAS, the Company intends to modify the terms of the Rights
Agreement in certain respects as set forth herein, and in connection therewith,
is entering into this Amendment and directing the Rights Agent to enter into
this Amendment.

                                      -1-

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         NOW, THEREFORE, for good and valuable consideration, the receipt and
adequacy of which are hereby acknowledged, the parties hereto agree as follows:

         1.       Capitalized Terms.  All capitalized, undefined terms used in
                  -----------------
this Amendment shall have the meanings assigned thereto in the Rights Agreement.

         2.       Amendment.  Section 1(a) of the Rights Agreement is hereby
                  ---------
amended by adding the following new paragraph to the end of Section 1(a):

         "Notwithstanding anything in this Agreement that might otherwise be
deemed to the contrary, neither Oplink Communications, Inc., a Delaware
corporation ("Oplink"), nor any of its Affiliates or Associates shall be deemed
to be an Acquiring Person solely by reason of: (i) the approval, execution or
delivery of, or the consummation of the transactions contemplated by (A) the
Agreement and Plan of Reorganization dated as of March 18, 2002 by and among
Company, a wholly owned subsidiary of Company and Oplink, including any
amendment or supplement thereto (the "Reorganization Agreement"), (B) the Voting
Agreements dated as of March 18, 2002 between Oplink and certain stockholders of
the Company or (C) the Avanex Stock Option Agreement dated as of March 18, 2002
between the Company and Oplink; or (ii) the announcement or consummation of the
Merger (as defined in the Reorganization Agreement)."

         3.       Effective Date. This Amendment shall become effective as of
                  --------------
the date first above written but such effectiveness is contingent upon (a) the
execution of this Amendment by the Company and authorization by the Board of
Directors of the Company approving the Amendment, and (b) the execution and
delivery of this Amendment by the Rights Agent.

         4.       Effect of Amendment.  Except as expressly provided herein, the
                  -------------------
Rights Agreement shall be and remain in full force and effect.

         5.       Governing Law.  This Amendment shall be governed by, construed
                  -------------
and enforced in accordance with the laws of the State of Delaware without
reference to the conflicts or choice of law principles thereof.

         6.       Counterparts.  This Amendment may be executed in separate
                  ------------
counterparts, each of which when executed and delivered is an original but all
of which taken together constitute one and the same instrument.

         7.       Fax Transmission.  A facsimile, telecopy or other reproduction
                  ----------------
of this Amendment may be executed by one or more parties hereto, and an executed
copy of this Amendment may be delivered by one or more parties hereto by
facsimile or similar instantaneous electronic transmission device pursuant to
which the signature of or on behalf of such party can be seen, and such
execution and delivery shall be considered valid, binding and effective for all
purposes. At the request of any party hereto, all parties hereto agree to
execute an original of the Amendment as well as any facsimile, telecopy or other
reproduction thereof.

         8.       Certification.  The undersigned officer of the Company, being
                  -------------
an appropriate officer of the Company and authorized to do so by resolution of
the Board of Directors of the Company

                                      -2-

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duly adopted and approved at a meeting held March 18, 2002, hereby certifies to
the Rights Agent that this amendment is in compliance with Section 27 of the
Rights Agreement.

         IN WITNESS WHEREOF, the Company and the Rights Agent have caused this
Amendment to be duly executed as of the day first above written.

                                    AVANEX CORPORATION

                                    By:     /s/ Jessy Chao
                                            ------------------------------

                                    Name:   Jessy Chao
                                            ------------------------------

                                    Title:  Chief Financial Officer
                                            ------------------------------

                                    EQUISERVE TRUST COMPANY, N.A.,
                                    as Rights Agent

                                    By:     /s/ Carol Mulvey-Eori
                                            ------------------------------

                                    Name:   Carol Mulvey-Eori
                                            ------------------------------

                                    Title:  Managing Director
                                            ------------------------------

                                      -3-<PAGE>
                                                                Exhibit 10.4

                                  MARIMBA, INC.

                   INTERNATIONAL EMPLOYEE STOCK PURCHASE PLAN

                   (AS AMENDED AND RESTATED OCTOBER 19, 2000)

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                                TABLE OF CONTENTS
                                -----------------

                                                                            Page
                                                                            ----

SECTION 1.  PURPOSE OF THE INTERNATIONAL PLAN................................. 1

SECTION 2.  ADMINISTRATION OF THE INTERNATIONAL PLAN.......................... 1
     (a)  Committee Composition............................................... 1
     (b)  Committee Responsibilities.......................................... 1

SECTION 3.  ENROLLMENT AND PARTICIPATION...................................... 1
     (a)  Offering Periods.................................................... 1
     (b)  Contribution Periods................................................ 1
     (c)  Enrollment.......................................................... 1
     (d)  Duration of Participation........................................... 1
     (e)  Applicable Offering Period.......................................... 2

SECTION 4.  EMPLOYEE CONTRIBUTIONS............................................ 2
     (a)  Frequency of Payroll Deductions..................................... 2
     (b)  Amount of Payroll Deductions........................................ 2
     (c)  Changing Withholding Rate........................................... 3
     (d)  Discontinuing Payroll Deductions.................................... 3
     (e)  Limit on Number of Elections........................................ 3

SECTION 5.  WITHDRAWAL FROM THE INTERNATIONAL PLAN............................ 3
     (a)  Withdrawal.......................................................... 3
     (b)  Re-Enrollment After Withdrawal...................................... 3

SECTION 6.  CHANGE IN EMPLOYMENT STATUS....................................... 3
     (a)  Termination of Employment........................................... 3
     (b)  Leave of Absence.................................................... 4
     (c)  Death............................................................... 4

SECTION 7.  INTERNATIONAL PLAN ACCOUNTS AND PURCHASE OF SHARES................ 4
     (a)  International Plan Accounts......................................... 4
     (b)  Purchase Price...................................................... 4
     (c)  Number of Shares Purchased.......................................... 4
     (d)  Available Shares Insufficient....................................... 5
     (e)  Issuance of Stock................................................... 5
     (f)  Unused Cash Balances................................................ 5

SECTION 8.  LIMITATIONS ON STOCK OWNERSHIP.................................... 5
     (a)  Five Percent Limit.................................................. 5
     (b)  Dollar Limit........................................................ 5

                                       i

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SECTION 9.  RIGHTS NOT TRANSFERABLE........................................... 6

SECTION 10.  NO RIGHTS AS AN EMPLOYEE......................................... 6

SECTION 11.  NO RIGHTS AS A STOCKHOLDER....................................... 7

SECTION 12.  SECURITIES LAW REQUIREMENTS...................................... 7

SECTION 13.  STOCK OFFERED UNDER THE INTERNATIONAL PLAN....................... 7
     (a)  Authorized Shares................................................... 7
     (b)  Anti-Dilution Adjustments........................................... 7
     (c)  Reorganizations..................................................... 7

SECTION 14.  AMENDMENT OR DISCONTINUANCE...................................... 7

SECTION 15.  DEFINITIONS...................................................... 8
     (a)  Board............................................................... 8
     (b)  Code................................................................ 8
     (c)  Committee........................................................... 8
     (d)  Company............................................................. 8
     (e)  Compensation........................................................ 8
     (f)  Contribution Period................................................. 8
     (g)  Corporate Reorganization............................................ 8
     (h)  Eligible Employee................................................... 8
     (i)  Exchange Act........................................................ 8
     (j)  Fair Market Value................................................... 9
     (o)  International Plan.................................................. 9
     (p)  International Plan Account.......................................... 9
     (k)  IPO................................................................. 9
     (l)  Offering Period..................................................... 9
     (m)  Participant......................................................... 9
     (n)  Participating Company............................................... 9
     (q)  Purchase Price...................................................... 9
     (r)  Stock............................................................... 9
     (s)  Subsidiary.......................................................... 9
     (t)  U.S. Plan.......................................................... 10

                                       ii

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                                  MARIMBA, INC.
                   INTERNATIONAL EMPLOYEE STOCK PURCHASE PLAN

SECTION 1.  PURPOSE OF THE INTERNATIONAL PLAN.

     The International Plan was adopted by the Board on February 2, 1999,
effective as of the date of the IPO. The purpose of the International Plan is to
provide Eligible Employees with an opportunity to increase their proprietary
interest in the success of the Company by purchasing Stock from the Company on
favorable terms and to pay for such purchases through payroll deductions. The
International Plan is not intended to qualify under section 423 of the Code.

SECTION 2.  ADMINISTRATION OF THE INTERNATIONAL PLAN.

     (a) Committee Composition. The International 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.

     (b) Committee Responsibilities. The Committee shall interpret the
International Plan and make all other policy decisions relating to the operation
of the International Plan. The Committee may adopt such rules, guidelines and
forms as it deems appropriate to implement the International Plan. The
Committee's determinations under the International Plan shall be final and
binding on all persons.

SECTION 3.  ENROLLMENT AND PARTICIPATION.

     (a) Offering Periods. While the International Plan is in effect, two
overlapping Offering Periods shall commence in each calendar year. The Offering
Periods shall consist of the 24-month periods commencing on each May 1 and
November 1, except that the first Offering Period shall commence on the date of
the IPO and end on April 30, 2001.

     (b) Contribution Periods. While the International Plan is in effect, two
Contribution Periods shall commence in each calendar year. The Contribution
Periods shall consist of the six-month periods commencing on each May 1 and
November 1, except that the first Contribution Period shall commence on the date
of the IPO and end on October 31, 1999.

     (c) Enrollment. Any individual who, on the day preceding the first day of
an Offering Period, qualifies as an Eligible Employee may elect to become a
Participant in the International Plan for such Offering Period by executing the
enrollment form prescribed for this purpose by the Committee. The enrollment
form shall be filed with the Company at the prescribed location not later than
10 business days prior to the commencement of such Offering Period, unless
otherwise provided by the Company.

     (d) Duration of Participation. Once enrolled in the International Plan, a
Participant shall continue to participate in the International Plan until he or
she ceases to be an Eligible

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Employee, withdraws from the International Plan under Section 5(a) or reaches
the end of the Contribution Period in which his or her employee contributions
were discontinued under Section 4(d) or 8(b). A Participant who discontinued
employee contributions under Section 4(d) or withdrew from the International
Plan under Section 5(a) may again become a Participant, if he or she then is an
Eligible Employee, by following the procedure described in Subsection (c) above.
A Participant whose employee contributions were discontinued automatically under
Section 8(b) shall automatically resume participation at the beginning of the
earliest Contribution Period ending in the next calendar year, if he or she then
is an Eligible Employee.

     (e) Applicable Offering Period. For purposes of calculating the Purchase
Price under Section 7(b), the applicable Offering Period shall be determined as
follows:

          (i)    Once a Participant is enrolled in the International Plan for an
     Offering Period, such Offering Period shall continue to apply to him or her
     until the earliest of (A) the end of such Offering Period, (B) the end of
     his or her participation under Subsection (d) above or (C) re-enrollment
     for a subsequent Offering Period under Paragraph (ii) or (iii) below.

          (ii)   In the event that the Fair Market Value of Stock on the last
     trading day before the commencement of the Offering Period for which the
     Participant is enrolled is higher than on the last trading day before the
     commencement of any subsequent Offering Period, the Participant shall
     automatically be re-enrolled for such subsequent Offering Period.

          (iii)  Any other provision of the International Plan notwithstanding,
     the Company (at its sole discretion) may determine prior to the
     commencement of any new Offering Period that all Participants shall be
     re-enrolled for such new Offering Period.

          (iv)   When a Participant reaches the end of an Offering Period but
     his or her participation is to continue, then such Participant shall
     automatically be re-enrolled for the Offering Period that commences
     immediately after the end of the prior Offering Period.

SECTION 4.  EMPLOYEE CONTRIBUTIONS.

     (a) Frequency of Payroll Deductions. A Participant may purchase shares of
Stock under the International Plan solely by means of payroll deductions.
Payroll deductions, as designated by the Participant pursuant to Subsection (b)
below, shall occur on each payday during participation in the International
Plan.

     (b) Amount of Payroll Deductions. An Eligible Employee shall designate on
the enrollment form the portion of his or her Compensation that he or she elects
to have withheld for the purchase of Stock. Such portion shall be a whole
percentage of the Eligible Employee's Compensation, but not less than 1% nor
more than 10% or such lesser percentage established by the Committee from time
to time. The payroll deduction authorized by the Participant for purposes of
acquiring shares of Common Stock under the International Plan shall be collected
in

                                       2

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the currency in which the Participant is paid his or her Compensation. Any
changes or fluctuations in the exchange rate at which the currency collected
from the Participant through such payroll deductions is converted into U.S.
Dollars on each purchase date under the International Plan shall be borne solely
by the Participant.

     (c) Changing Withholding Rate. If a Participant wishes to change the rate
of payroll withholding, he or she may do so by filing a new enrollment form with
the Company at the prescribed location at any time. The new withholding rate
shall be effective as soon as reasonably practicable after such form has been
received by the Company. The new withholding rate shall be a whole percentage of
the Eligible Employee's Compensation, but not less than 1% nor more than 10% or
such lesser percentage established by the Committee.

     (d) Discontinuing Payroll Deductions. If a Participant wishes to
discontinue employee contributions entirely, he or she may do so by filing a new
enrollment form with the Company at the prescribed location at any time. Payroll
withholding shall cease as soon as reasonably practicable after such form has
been received by the Company. (In addition, employee contributions may be
discontinued automatically pursuant to Section 8(b).) A Participant who has
discontinued employee contributions may resume such contributions by filing a
new enrollment form with the Company at the prescribed location. Payroll
withholding shall resume as soon as reasonably practicable after such form has
been received by the Company.

     (e) Limit on Number of Elections. No Participant shall make more than two
elections under Subsection (c) or (d) above within any Contribution Period.

SECTION 5.  WITHDRAWAL FROM THE INTERNATIONAL PLAN.

     (a) Withdrawal. A Participant may elect to withdraw from the International
Plan by filing the prescribed form with the Company at the prescribed location
at any time before the last day of a Contribution Period. As soon as reasonably
practicable thereafter, payroll deductions shall cease and the entire amount
credited to the Participant's International Plan Account shall be refunded to
him or her in cash in the currency in which the Participant is paid, without
interest. No partial withdrawals shall be permitted.

     (b) Re-Enrollment After Withdrawal. A former Participant who has withdrawn
from the International Plan shall not be a Participant until he or she
re-enrolls in the International Plan under Section 3(c). Re-enrollment may be
effective only at the commencement of an Offering Period.

SECTION 6.  CHANGE IN EMPLOYMENT STATUS.

     (a) Termination of Employment. Termination of employment as an Eligible
Employee for any reason, including death, shall be treated as an automatic
withdrawal from the International Plan under Section 5(a). (A transfer from one
Participating Company to another shall not be treated as a termination of
employment.)

                                       3

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     (b) Leave of Absence. For purposes of the International Plan, employment
shall not be deemed to terminate when the Participant goes on a military leave,
a sick leave or another bona fide leave of absence, if the leave was approved by
the Company in writing. Employment, however, shall be deemed to terminate 90
days after the Participant goes on a leave, unless a contract or statute
guarantees his or her right to return to work. Employment shall be deemed to
terminate in any event when the approved leave ends, unless the Participant
immediately returns to work.

     (c) Death. In the event of the Participant's death, the amount credited to
his or her International Plan Account shall be paid to a beneficiary designated
by him or her for this purpose on the prescribed form or, if none, to the
Participant's estate. Such form shall be valid only if it was filed with the
Company at the prescribed location before the Participant's death.

SECTION 7.  INTERNATIONAL PLAN ACCOUNTS AND PURCHASE OF SHARES.

     (a) International Plan Accounts. The Company shall maintain an
International Plan Account on its books in the name of each Participant.
Whenever an amount is deducted from the Participant's Compensation under the
International Plan, such amount shall be credited to the Participant's
International Plan Account. Amounts credited to International Plan Accounts
shall not be trust funds and may be commingled with the Company's general assets
and applied to general corporate purposes. No interest shall be credited to
International Plan Accounts.

     (b) Purchase Price. The Purchase Price for each share of Stock purchased at
the close of a Contribution Period shall be the lower of:

          (i)    85% of the Fair Market Value of such share on the last trading
     day in such Contribution Period; or

          (ii)   85% of the Fair Market Value of such share on the last trading
     day before the commencement of the applicable Offering Period (as
     determined under Section 3(e)) or, in the case of the first Offering Period
     under the International Plan, 85% of the price at which one share of Stock
     is offered to the public in the IPO.

     (c) Number of Shares Purchased. As of the last day of each Contribution
Period, each Participant shall be deemed to have elected to purchase the number
of shares of Stock calculated in accordance with this Subsection (c), unless the
Participant has previously elected to withdraw from the International Plan in
accordance with Section 5(a). On the last U.S. business day of each Contribution
Period, the payroll deductions, in the currency in which collected from the
Participant, shall be converted into U.S. Dollars at the exchange rate in effect
for that day. The amount then in the Participant's International Plan Account
shall be divided by the Purchase Price, and the number of shares that results
shall be purchased from the Company with the funds in the Participant's
International Plan Account. The foregoing notwithstanding, no Participant shall
purchase more than 1,500 shares of Stock with respect to any Contribution Period
nor more than the amounts of Stock set forth in Sections 8(b) and 13(a). The
Committee may determine with respect to all Participants that any fractional
share, as calculated under this Subsection (c), shall be (i) rounded down to the
next lower whole share or (ii) credited as a fractional share.

                                       4

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     (d) Available Shares Insufficient. In the event that the aggregate number
of shares that all Participants elect to purchase during a Contribution Period
exceeds the maximum number of shares remaining available for issuance under
Section 13(a), then the number of shares to which each Participant is entitled
shall be determined by multiplying the number of shares available for issuance
by a fraction, the numerator of which is the number of shares that such
Participant has elected to purchase and the denominator of which is the number
of shares that all Participants have elected to purchase.

     (e) Issuance of Stock. Certificates representing the shares of Stock
purchased by a Participant under the International Plan shall be issued to him
or her as soon as reasonably practicable after the close of the applicable
Contribution Period, except that the Committee may determine that such shares
shall be held for each Participant's benefit by a broker designated by the
Committee (unless the Participant has elected that certificates be issued to him
or her). Shares may be registered in the name of the Participant or jointly in
the name of the Participant and his or her spouse as permitted by applicable
law.

     (f) Unused Cash Balances. An amount remaining in the Participant's
International Plan Account that represents the Purchase Price for any fractional
share shall be carried over in the Participant's International Plan Account to
the next Contribution Period. Any amount remaining in the Participant's
International Plan Account that represents the Purchase Price for whole shares
that could not be purchased by reason of Subsection (c) above, Section 8(b) or
Section 13(a) shall be refunded to the Participant in cash in the currency in
which the Participant is paid, without interest.

SECTION 8.  LIMITATIONS ON STOCK OWNERSHIP.

     (a) Five Percent Limit. Unless the Board elects to waive this provision, no
Participant shall be granted a right to purchase Stock under the International
Plan if such Participant, immediately after his or her election to purchase such
Stock, would own stock possessing more than 5% of the total combined voting
power or value of all classes of stock of the Company or any parent or
Subsidiary of the Company. For purposes of this Subsection (a), the following
rules shall apply:

          (i)    Ownership of stock shall be determined after applying the
     attribution rules of section 424(d) of the Code;

          (ii)   Each Participant shall be deemed to own any stock that he or
     she has a right or option to purchase under this or any other plan; and

          (iii)  Each Participant shall be deemed to have the right to purchase
     1,500 shares of Stock under this International Plan with respect to each
     Contribution Period.

     (b) Dollar Limit. Any other provision of the International Plan
notwithstanding, no Participant shall purchase Stock with a Fair Market Value in
excess of the following limit:

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          (i)    In the case of Stock purchased during an Offering Period that
     commenced in the current calendar year, the limit shall be equal to (A)
     $25,000 minus (B) the Fair Market Value of the Stock that the Participant
     previously purchased in the current calendar year (under this International
     Plan and all other employee stock purchase plans of the Company or any
     parent or Subsidiary of the Company).

          (ii)   In the case of Stock purchased during an Offering Period that
     commenced in the immediately preceding calendar year, the limit shall be
     equal to (A) $50,000 minus (B) the Fair Market Value of the Stock that the
     Participant previously purchased (under this International Plan and all
     other employee stock purchase plans of the Company or any parent or
     Subsidiary of the Company) in the current calendar year and in the
     immediately preceding calendar year.

          (iii)  In the case of Stock purchased during an Offering Period that
     commenced in the second preceding calendar year, the limit shall be equal
     to (A) $75,000 minus (B) the Fair Market Value of the Stock that the
     Participant previously purchased (under this International Plan and all
     other employee stock purchase plans of the Company or any parent or
     Subsidiary of the Company) in the current calendar year and in the two
     preceding calendar years.

For purposes of this Subsection (b), the Fair Market Value of Stock shall be
determined in each case as of the beginning of the Offering Period in which such
Stock is purchased. If a Participant is precluded by this Subsection (b) from
purchasing additional Stock under the International Plan, then his or her
employee contributions shall automatically be discontinued and shall resume at
the beginning of the earliest Contribution Period ending in the next calendar
year (if he or she then is an Eligible Employee).

SECTION 9.  RIGHTS NOT TRANSFERABLE.

     The rights of any Participant under the International Plan, or any
Participant's interest in any Stock or moneys to which he or she may be entitled
under the International Plan, shall not be transferable by voluntary or
involuntary assignment or by operation of law, or in any other manner other than
by beneficiary designation or the laws of descent and distribution. If a
Participant in any manner attempts to transfer, assign or otherwise encumber his
or her rights or interest under the International Plan, other than by
beneficiary designation or the laws of descent and distribution, then such act
shall be treated as an election by the Participant to withdraw from the
International Plan under Section 5(a).

SECTION 10. NO RIGHTS AS AN EMPLOYEE.

         Nothing in the International Plan or in any right granted under the
International Plan shall confer upon the Participant any right to continue in
the employ of a Participating Company for any period of specific duration or
interfere with or otherwise restrict in any way the rights of the Participating
Companies or of the Participant, which rights are hereby expressly reserved by
each, to terminate his or her employment at any time and for any reason, with or
without cause.

                                       6

<PAGE>

SECTION 11. NO RIGHTS AS A STOCKHOLDER.

     A Participant shall have no rights as a stockholder with respect to any
shares of Stock that he or she may have a right to purchase under the
International Plan until such shares have been purchased on the last day of the
applicable Contribution Period.

SECTION 12. Securities Law Requirements.

     Shares of Stock shall not be issued under the International Plan unless the
issuance and delivery of such shares comply with (or are exempt from) all
applicable requirements of law, including (without limitation) the Securities
Act of 1933, as amended, the rules and regulations promulgated thereunder, state
securities laws and regulations, and the regulations of any stock exchange or
other securities market on which the Company's securities may then be traded.

SECTION 13. STOCK OFFERED UNDER THE INTERNATIONAL PLAN.

     (a) Authorized Shares. The number of shares of Stock available for purchase
in the aggregate over the term of the International Plan and the U.S. Plan shall
be 500,000 (subject to adjustment pursuant to this Section 13). Share issuances
under the U.S. Plan shall reduce on a share-for-share basis the number of shares
available for issuance under this International Plan. As of January 1 of each
year, commencing with the year 2000, the aggregate number of shares of Stock
available for purchase during the life of the International Plan and U.S. Plan
shall automatically increase by a number equal to the lesser of (a) 2% of the
total number of shares of Stock then outstanding or (b) 500,000.

     (b) Anti-Dilution Adjustments. The aggregate number of shares of Stock
offered under the International Plan, the 1,500-share limitation described in
Section 7(c) and the price of shares that any Participant has elected to
purchase shall be adjusted proportionately by the Committee for any increase or
decrease in the number of outstanding shares of Stock resulting from a
subdivision or consolidation of shares or the payment of a stock dividend, any
other increase or decrease in such shares effected without receipt or payment of
consideration by the Company, the distribution of the shares of a Subsidiary to
the Company's stockholders or a similar event.

     (c) Reorganizations. Any other provision of the International Plan
notwithstanding, immediately prior to the effective time of a Corporate
Reorganization, the Offering Period and Contribution Period then in progress
shall terminate and shares shall be purchased pursuant to Section 7, unless the
International Plan is assumed by the surviving corporation or its parent
corporation pursuant to the plan of merger or consolidation. The International
Plan shall in no event be construed to restrict in any way the Company's right
to undertake a dissolution, liquidation, merger, consolidation or other
reorganization.

SECTION 14. AMENDMENT OR DISCONTINUANCE.

     The Board shall have the right to amend, suspend or terminate the
International Plan at any time and without notice. In addition, any other
amendment of the International Plan shall be

                                       7

<PAGE>

subject to approval by a vote of the stockholders of the Company to the extent
required by an applicable law or regulation. The International Plan was amended
by the Board on October 19, 2000 to increase the share limitation described in
Section 7(c) from 500 shares to 1,500 shares.

SECTION 15. DEFINITIONS.

     (a) "Board" means the Board of Directors of the Company, as constituted
from time to time.

     (b) "Code" means the Internal Revenue Code of 1986, as amended.

     (c) "Committee" means a committee of the Board, as described in Section 2.

     (d) "Company" means Marimba, Inc., a Delaware corporation.

     (e) "Compensation" means (i) the total compensation paid in cash to a
Participant by a Participating Company, including salaries, wages, bonuses,
incentive compensation, commissions, overtime pay and shift premiums, plus (ii)
any pre-tax contributions made by the Participant under section 401(k) or 125 of
the Code. "Compensation" shall exclude all non-cash items, moving or relocation
allowances, cost-of-living equalization payments, car allowances, tuition
reimbursements, imputed income attributable to cars or life insurance, severance
pay, fringe benefits, contributions or benefits received under employee benefit
plans, income attributable to the exercise of stock options, and similar items.
The Committee shall determine whether a particular item is included in
Compensation.

     (f) "Contribution Period" means a six-month period during which
contributions may be made toward the purchase of Stock under the International
Plan, as determined pursuant to Section 3(b).

     (g) "Corporate Reorganization" means:

          (i)    The consummation of a merger or consolidation of the Company
     with or into another entity or any other corporate reorganization; or

          (ii)   The sale, transfer or other disposition of all or substantially
     all of the Company's assets or the complete liquidation or dissolution of
     the Company.

     (h) "Eligible Employee" means any employee of a Participating Company who
is not a U.S. citizen or is a U.S. citizen working abroad who is not paid in
U.S. currency, if his or her customary employment is for more than five months
per calendar year and for more than 20 hours per week.

The foregoing notwithstanding, an individual shall not be considered an Eligible
Employee if his or her participation in the International Plan is prohibited by
the law of any country which has jurisdiction over him or her or if he or she is
subject to a collective bargaining agreement that does not provide for
participation in the International Plan.

     (i) "Exchange Act" means the Securities Exchange Act of 1934, as amended.

                                       8

<PAGE>

     (j) "Fair Market Value" means the market price of Stock, determined by the
Committee as follows:

          (i)    If the Stock was traded on The Nasdaq National Market on the
     date in question, then the Fair Market Value shall be equal to the
     last-transaction price quoted for such date by The Nasdaq National Market;

          (ii)   If the Stock was traded on a stock exchange on the date in
     question, then the Fair Market Value shall be equal to the closing price
     reported by the applicable composite transactions report for such date; or

          (iii)  If none of the foregoing provisions is applicable, then the
     Fair Market Value shall be 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 or as reported
                                   -----------------------
directly to the Company by Nasdaq or a stock exchange. Such determination shall
be conclusive and binding on all persons.

     (k) "International Plan" means this Marimba, Inc. International Employee
Stock Purchase Plan, as it may be amended from time to time.

     (l) "International Plan Account" means the account established for each
Participant pursuant to Section 7(a).

     (m) "IPO" means the initial offering of Stock to the public pursuant to a
registration statement filed by the Company with the Securities and Exchange
Commission.

     (n) "Offering Period" means a 24-month period with respect to which the
right to purchase Stock may be granted under the International Plan, as
determined pursuant to Section 3(a).

     (o) "Participant" means an Eligible Employee who elects to participate in
the International Plan, as provided in Section 3(c).

     (p) "Participating Company" means (i) the Company and (ii) each present or
future Subsidiary designated by the Committee or the Board as a Participating
Company.

     (q) "Purchase Price" means the price at which Participants may purchase
Stock under the International Plan, as determined pursuant to Section 7(b).

     (r) "Stock" means the Common Stock of the Company.

     (s) "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.

                                       9

<PAGE>

     (t) "U.S. Plan" means the Company's employee stock purchase plan for
employees of the Company who are residents of the United States.

                                       10

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