Document:

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                                                                   EXHIBIT 10.6

                            KABIRA TECHNOLOGIES, INC.

                                 2000 STOCK PLAN

      1. Purposes of the Plan. The purposes of this 2000 Stock Plan are:

            -     to attract and retain the best available personnel for
                  positions of substantial responsibility,

            -     to provide additional incentive to Employees, Directors and
                  Consultants, and

            -     to promote the success of the Company's business.

            Options granted under the Plan may be Incentive Stock Options or
Nonstatutory Stock Options, as determined by the Administrator at the time of
grant. Stock Purchase Rights may also be granted under the Plan.

      2. Definitions. As used herein, the following definitions shall apply:

            (a) "Administrator" means the Board or any of its Committees as
shall be administering the Plan, in accordance with Section 4 of the Plan.

            (b) "Applicable Laws" means the requirements relating to the
administration of stock option plans under U. S. state corporate laws, U.S.
federal and state securities laws, the Code, any stock exchange or quotation
system on which the Common Stock is listed or quoted and the applicable laws of
any foreign country or jurisdiction where Options or Stock Purchase Rights are,
or will be, granted under the Plan.

            (c) "Board" means the Board of Directors of the Company.

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

            (e) "Committee" means a committee of Directors appointed by the
Board in accordance with Section 4 of the Plan.

            (f) "Common Stock" means the common stock of the Company.

            (g) "Company" means Kabira Technologies, Inc., a Delaware
corporation.

            (h) "Consultant" means any person, including an advisor, engaged by
the Company or a Parent or Subsidiary to render services to such entity.

            (i) "Director" means a member of the Board.

            (j) "Disability" means total and permanent disability as defined in
Section 22(e)(3) of the Code.

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            (k) "Employee" means any person, including Officers and Directors,
employed by the Company or any Parent or Subsidiary of the Company. A Service
Provider shall not cease to be an Employee in the case of (i) any leave of
absence approved by the Company or (ii) transfers between locations of the
Company or between the Company, its Parent, any Subsidiary, or any successor.
For purposes of Incentive Stock Options, no such leave may exceed ninety days,
unless reemployment upon expiration of such leave is guaranteed by statute or
contract. If reemployment upon expiration of a leave of absence approved by the
Company is not so guaranteed, on the 181st day of such leave any Incentive Stock
Option held by the Optionee shall cease to be treated as an Incentive Stock
Option and shall be treated for tax purposes as a Nonstatutory Stock Option.
Neither service as a Director nor payment of a director's fee by the Company
shall be sufficient to constitute "employment" by the Company.

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

            (m) "Fair Market Value" means, as of any date, the value of Common
Stock determined as follows:

                     (i) If the Common Stock is listed on any established stock
exchange or a national market system, including without limitation the Nasdaq
National Market or The Nasdaq SmallCap Market of The Nasdaq Stock Market, its
Fair Market Value shall be the closing sales price for such stock (or the
closing bid, if no sales were reported) as quoted on such exchange or system for
the last market trading day prior to the time of determination, as reported in
The Wall Street Journal or such other source as the Administrator deems
reliable;

                     (ii) If the Common Stock is regularly quoted by a
recognized securities dealer but selling prices are not reported, the Fair
Market Value of a Share of Common Stock shall be the mean between the high bid
and low asked prices for the Common Stock on the last market trading day prior
to the day of determination, as reported in The Wall Street Journal or such
other source as the Administrator deems reliable; or

                     (iii) In the absence of an established market for the
Common Stock, the Fair Market Value shall be determined in good faith by the
Administrator.

            (n) "Incentive Stock Option" means an Option intended to qualify as
an incentive stock option within the meaning of Section 422 of the Code and the
regulations promulgated thereunder.

            (o) "Nonstatutory Stock Option" means an Option not intended to
qualify as an Incentive Stock Option.

            (p) "Notice of Grant" means a written or electronic notice
evidencing certain terms and conditions of an individual Option or Stock
Purchase Right grant. The Notice of Grant is part of the Option Agreement.

            (q) "Officer" means a person who is an officer of the Company within
the meaning of Section 16 of the Exchange Act and the rules and regulations
promulgated thereunder.

            (r) "Option" means a stock option granted pursuant to the Plan.

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            (s) "Option Agreement" means an agreement between the Company and an
Optionee evidencing the terms and conditions of an individual Option grant. The
Option Agreement is subject to the terms and conditions of the Plan.

            (t) "Option Exchange Program" means a program whereby outstanding
Options are surrendered in exchange for Options with a lower exercise price.

            (u) "Optioned Stock" means the Common Stock subject to an Option or
Stock Purchase Right.

            (v) "Optionee" means the holder of an outstanding Option or Stock
Purchase Right granted under the Plan.

            (w) "Parent" means a "parent corporation," whether now or hereafter
existing, as defined in Section 424(e) of the Code.

            (x) "Plan" means this Kabira Technologies, Inc. 2000 Stock Plan.

            (y) "Restricted Stock" means shares of Common Stock acquired
pursuant to a grant of Stock Purchase Rights under Section 11 of the Plan.

            (z) "Restricted Stock Purchase Agreement" means a written agreement
between the Company and the Optionee evidencing the terms and restrictions
applying to stock purchased under a Stock Purchase Right. The Restricted Stock
Purchase Agreement is subject to the terms and conditions of the Plan and the
Notice of Grant.

            (aa) "Rule 16b-3" means Rule 16b-3 of the Exchange Act or any
successor to Rule 16b-3, as in effect when discretion is being exercised with
respect to the Plan.

            (bb) "Section 16(b) " means Section 16(b) of the Exchange Act.

            (cc) "Service Provider" means an Employee, Director or Consultant.

            (dd) "Share" means a share of the Common Stock, as adjusted in
accordance with Section 13 of the Plan.

            (ee) "Stock Purchase Right" means the right to purchase Common Stock
pursuant to Section 11 of the Plan, as evidenced by a Notice of Grant.

            (ff) "Subsidiary" means a "subsidiary corporation", whether now or
hereafter existing, as defined in Section 424(f) of the Code.

      3. Stock Subject to the Plan. Subject to the provisions of Section 13 of
the Plan, the maximum aggregate number of Shares that may be optioned and sold
under the Plan is 4,000,000 Shares, plus an annual increase to be added on the
first day of the Company's fiscal year, beginning in 2001, equal to the least of
(i) 4,000,000 shares, (ii) 6% of the outstanding shares on such date, and (iii)
a lesser amount determined by the Board. The Shares may be authorized, but
unissued, or reacquired Common Stock.

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            If an Option or Stock Purchase Right expires or becomes
unexercisable without having been exercised in full, or is surrendered pursuant
to an Option Exchange Program, the unpurchased Shares which were subject thereto
shall become available for future grant or sale under the Plan (unless the Plan
has terminated); provided, however, that Shares that have actually been issued
under the Plan, whether upon exercise of an Option or Right, shall not be
returned to the Plan and shall not become available for future distribution
under the Plan, except that if Shares of Restricted Stock are repurchased by the
Company at their original purchase price, such Shares shall become available for
future grant under the Plan.

      4. Administration of the Plan.

            (a) Procedure.

                     (i) Multiple Administrative Bodies. Different Committees
with respect to different groups of Service Providers may administer the Plan.

                     (ii) Section 162(m). To the extent that the Administrator
determines it to be desirable to qualify Options granted hereunder as
"performance-based compensation" within the meaning of Section 162(m) of the
Code, the Plan shall be administered by a Committee of two or more "outside
directors" within the meaning of Section 162(m) of the Code.

                     (iii) Rule 16b-3. To the extent desirable to qualify
transactions hereunder as exempt under Rule 16b-3, the transactions contemplated
hereunder shall be structured to satisfy the requirements for exemption under
Rule 16b-3.

                     (iv) Other Administration. Other than as provided above,
the Plan shall be administered by (A) the Board or (B) a Committee, which
committee shall be constituted to satisfy Applicable Laws.

            (b) Powers of the Administrator. Subject to the provisions of the
Plan, and in the case of a Committee, subject to the specific duties delegated
by the Board to such Committee, the Administrator shall have the authority, in
its discretion:

                     (i) to determine the Fair Market Value;

                     (ii) to select the Service Providers to whom Options and
Stock Purchase Rights may be granted hereunder;

                     (iii) to determine the number of shares of Common Stock to
be covered by each Option and Stock Purchase Right granted hereunder;

                     (iv) to approve forms of agreement for use under the Plan;

                     (v) to determine the terms and conditions, not inconsistent
with the terms of the Plan, of any Option or Stock Purchase Right granted
hereunder. Such terms and conditions include, but are not limited to, the
exercise price, the time or times when Options or Stock Purchase Rights may be
exercised (which may be based on performance criteria), any vesting acceleration
or waiver of forfeiture restrictions, and any restriction or limitation
regarding any Option or Stock

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Purchase Right or the shares of Common Stock relating thereto, based in each
case on such factors as the Administrator, in its sole discretion, shall
determine;

                     (vi) to reduce the exercise price of
any Option or Stock Purchase Right to the then current Fair Market Value if the
Fair Market Value of the Common Stock covered by such Option or Stock Purchase
Right shall have declined since the date the Option or Stock Purchase Right was
granted;

                     (vii) to institute an Option Exchange Program;

                     (viii) to construe and interpret the terms of the Plan and
awards granted pursuant to the Plan;

                     (ix) to prescribe, amend and rescind rules and regulations
relating to the Plan, including rules and regulations relating to sub-plans
established for the purpose of qualifying for preferred tax treatment under
foreign tax laws;

                     (x) to modify or amend each Option or Stock Purchase Right
(subject to Section 15(c) of the Plan), including the discretionary authority to
extend the post-termination exercisability period of Options longer than is
otherwise provided for in the Plan;

                     (xi) to allow Optionees to satisfy withholding tax
obligations by electing to have the Company withhold from the Shares to be
issued upon exercise of an Option or Stock Purchase Right that number of Shares
having a Fair Market Value equal to the amount required to be withheld. The Fair
Market Value of the Shares to be withheld shall be determined on the date that
the amount of tax to be withheld is to be determined. All elections by an
Optionee to have Shares withheld for this purpose shall be made in such form and
under such conditions as the Administrator may deem necessary or advisable;

                     (xii) to authorize any person to execute on behalf of the
Company any instrument required to effect the grant of an Option or Stock
Purchase Right previously granted by the Administrator;

                     (xiii) to make all other determinations deemed necessary or
advisable for administering the Plan.

            (c) Effect of Administrator's Decision. The Administrator's
decisions, determinations and interpretations shall be final and binding on all
Optionees and any other holders of Options or Stock Purchase Rights.

      5. Eligibility. Nonstatutory Stock Options and Stock Purchase Rights may
be granted to Service Providers. Incentive Stock Options may be granted only to
Employees.

      6. Limitations.

            (a) Each Option shall be designated in the Option Agreement as
either an Incentive Stock Option or a Nonstatutory Stock Option. However,
notwithstanding such designation, to the extent that the aggregate Fair Market
Value of the Shares with respect to which

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Incentive Stock Options are exercisable for the first time by the Optionee
during any calendar year (under all plans of the Company and any Parent or
Subsidiary) exceeds $100,000, such Options shall be treated as Nonstatutory
Stock Options. For purposes of this Section 6(a), Incentive Stock Options shall
be taken into account in the order in which they were granted. The Fair Market
Value of the Shares shall be determined as of the time the Option with respect
to such Shares is granted.

            (b) Neither the Plan nor any Option or Stock Purchase Right shall
confer upon an Optionee any right with respect to continuing the Optionee's
relationship as a Service Provider with the Company, nor shall they interfere in
any way with the Optionee's right or the Company's right to terminate such
relationship at any time, with or without cause.

            (c) The following limitations shall apply to grants of Options:

                     (i) No Service Provider shall be granted, in any fiscal
year of the Company, Options to purchase more than 1,000,000 Shares.

                     (ii) In connection with his or her initial service, a
Service Provider may be granted Options to purchase up to an additional
1,000,000 Shares, which shall not count against the limit set forth in
subsection (i) above.

                     (iii) The foregoing limitations shall be adjusted
proportionately in connection with any change in the Company's capitalization as
described in Section 13.

                     (iv) If an Option is cancelled in the same fiscal year of
the Company in which it was granted (other than in connection with a transaction
described in Section 13), the cancelled Option will be counted against the
limits set forth in subsections (i) and (ii) above. For this purpose, if the
exercise price of an Option is reduced, the transaction will be treated as a
cancellation of the Option and the grant of a new Option.

      7. Term of Plan. Subject to Section 19 of the Plan, the Plan shall become
effective upon its adoption by the Board. It shall continue in effect for a term
of ten (10) years unless terminated earlier under Section 15 of the Plan.

      8. Term of Option. The term of each Option shall be stated in the Option
Agreement. In the case of an Incentive Stock Option, the term shall be ten (10)
years from the date of grant or such shorter term as may be provided in the
Option Agreement. Moreover, in the case of an Incentive Stock Option granted to
an Optionee who, at the time the Incentive Stock Option is granted, owns stock
representing more than ten percent (10%) of the total combined voting power of
all classes of stock of the Company or any Parent or Subsidiary, the term of the
Incentive Stock Option shall be five (5) years from the date of grant or such
shorter term as may be provided in the Option Agreement.

      9. Option Exercise Price and Consideration.

            (a) Exercise Price. The per share exercise price for the Shares to
be issued pursuant to exercise of an Option shall be determined by the
Administrator, subject to the following:

                     (i) In the case of an Incentive Stock Option

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                        (A) granted to an Employee who, at the time the
Incentive Stock Option is granted, owns stock representing more than ten percent
(10%) of the voting power of all classes of stock of the Company or any Parent
or Subsidiary, the per Share exercise price shall be no less than 110% of the
Fair Market Value per Share on the date of grant.

                        (B) granted to any Employee other than an Employee
described in paragraph (A) immediately above, the per Share exercise price shall
be no less than 100% of the Fair Market Value per Share on the date of grant.

                     (ii) In the case of a Nonstatutory Stock Option, the per
Share exercise price shall be determined by the Administrator. In the case of a
Nonstatutory Stock Option intended to qualify as "performance-based
compensation" within the meaning of Section 162(m) of the Code, the per Share
exercise price shall be no less than 100% of the Fair Market Value per Share on
the date of grant.

                     (iii) Notwithstanding the foregoing, Options may be granted
with a per Share exercise price of less than 100% of the Fair Market Value per
Share on the date of grant pursuant to a merger or other corporate transaction.

            (b) Waiting Period and Exercise Dates. At the time an Option is
granted, the Administrator shall fix the period within which the Option may be
exercised and shall determine any conditions that must be satisfied before the
Option may be exercised.

            (c) Form of Consideration. The Administrator shall determine the
acceptable form of consideration for exercising an Option, including the method
of payment. In the case of an Incentive Stock Option, the Administrator shall
determine the acceptable form of consideration at the time of grant. Such
consideration may consist entirely of:

                     (i) cash;

                     (ii) check;

                     (iii) promissory note;

                     (iv) other Shares which (A) in the case of Shares acquired
upon exercise of an option, have been owned by the Optionee for more than six
months on the date of surrender, and (B) have a Fair Market Value on the date of
surrender equal to the aggregate exercise price of the Shares as to which said
Option shall be exercised;

                     (v) consideration received by the Company under a cashless
exercise program implemented by the Company in connection with the Plan;

                     (vi) a reduction in the amount of any Company liability to
the Optionee, including any liability attributable to the Optionee's
participation in any Company-sponsored deferred compensation program or
arrangement;

                     (vii) any combination of the foregoing methods of payment;
or

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                     (viii) such other consideration and method of payment for
the issuance of Shares to the extent permitted by Applicable Laws.

      10. Exercise of Option.

            (a) Procedure for Exercise; Rights as a Stockholder. Any Option
granted hereunder shall be exercisable according to the terms of the Plan and at
such times and under such conditions as determined by the Administrator and set
forth in the Option Agreement. Unless the Administrator provides otherwise,
vesting of Options granted hereunder shall be tolled during any unpaid leave of
absence. An Option may not be exercised for a fraction of a Share.

                  An Option shall be deemed exercised when the Company receives:
(i) written or electronic notice of exercise (in accordance with the Option
Agreement) from the person entitled to exercise the Option, and (ii) full
payment for the Shares with respect to which the Option is exercised. Full
payment may consist of any consideration and method of payment authorized by the
Administrator and permitted by the Option Agreement and the Plan. Shares issued
upon exercise of an Option shall be issued in the name of the Optionee or, if
requested by the Optionee, in the name of the Optionee and his or her spouse.
Until the Shares are issued (as evidenced by the appropriate entry on the books
of the Company or of a duly authorized transfer agent of the Company), no right
to vote or receive dividends or any other rights as a stockholder shall exist
with respect to the Optioned Stock, notwithstanding the exercise of the Option.
The Company shall issue (or cause to be issued) such Shares promptly after the
Option is exercised. No adjustment will be made for a dividend or other right
for which the record date is prior to the date the Shares are issued, except as
provided in Section 13 of the Plan.

                  Exercising an Option in any manner shall decrease the number
of Shares thereafter available, both for purposes of the Plan and for sale under
the Option, by the number of Shares as to which the Option is exercised.

            (b) Termination of Relationship as a Service Provider. If an
Optionee ceases to be a Service Provider, other than upon the Optionee's death
or Disability, the Optionee may exercise his or her Option within such period of
time as is specified in the Option Agreement to the extent that the Option is
vested on the date of termination (but in no event later than the expiration of
the term of such Option as set forth in the Option Agreement). In the absence of
a specified time in the Option Agreement, the Option shall remain exercisable
for three (3) months following the Optionee's termination. If, on the date of
termination, the Optionee is not vested as to his or her entire Option, the
Shares covered by the unvested portion of the Option shall revert to the Plan.
If, after termination, the Optionee does not exercise his or her Option within
the time specified by the Administrator, the Option shall terminate, and the
Shares covered by such Option shall revert to the Plan.

            (c) Disability of Optionee. If an Optionee ceases to be a Service
Provider as a result of the Optionee's Disability, the Optionee may exercise his
or her Option within such period of time as is specified in the Option Agreement
to the extent the Option is vested on the date of termination (but in no event
later than the expiration of the term of such Option as set forth in the Option
Agreement). In the absence of a specified time in the Option Agreement, the
Option shall remain exercisable for twelve (12) months following the Optionee's
termination. If, on the date of

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termination, the Optionee is not vested as to his or her entire Option, the
Shares covered by the unvested portion of the Option shall revert to the Plan.
If, after termination, the Optionee does not exercise his or her Option within
the time specified herein, the Option shall terminate, and the Shares covered by
such Option shall revert to the Plan.

            (d) Death of Optionee. If an Optionee dies while a Service Provider,
the Option may be exercised within such period of time as is specified in the
Option Agreement (but in no event later than the expiration of the term of such
Option as set forth in the Notice of Grant), by the Optionee's estate or by a
person who acquires the right to exercise the Option by bequest or inheritance,
but only to the extent that the Option is vested on the date of death. In the
absence of a specified time in the Option Agreement, the Option shall remain
exercisable for twelve (12) months following the Optionee's termination. If, at
the time of death, the Optionee is not vested as to his or her entire Option,
the Shares covered by the unvested portion of the Option shall immediately
revert to the Plan. The Option may be exercised by the executor or administrator
of the Optionee's estate or, if none, by the person(s) entitled to exercise the
Option under the Optionee's will or the laws of descent or distribution. If the
Option is not so exercised within the time specified herein, the Option shall
terminate, and the Shares covered by such Option shall revert to the Plan.

            (e) Buyout Provisions. The Administrator may at any time offer to
buy out for a payment in cash or Shares an Option previously granted based on
such terms and conditions as the Administrator shall establish and communicate
to the Optionee at the time that such offer is made.

      11. Stock Purchase Rights.

            (a) Rights to Purchase. Stock Purchase Rights may be issued either
alone, in addition to, or in tandem with other awards granted under the Plan
and/or cash awards made outside of the Plan. After the Administrator determines
that it will offer Stock Purchase Rights under the Plan, it shall advise the
offeree in writing or electronically, by means of a Notice of Grant, of the
terms, conditions and restrictions related to the offer, including the number of
Shares that the offeree shall be entitled to purchase, the price to be paid, and
the time within which the offeree must accept such offer. The offer shall be
accepted by execution of a Restricted Stock Purchase Agreement in the form
determined by the Administrator.

            (b) Repurchase Option. Unless the Administrator determines
otherwise, the Restricted Stock Purchase Agreement shall grant the Company a
repurchase option exercisable upon the voluntary or involuntary termination of
the purchaser's service with the Company for any reason (including death or
Disability). The purchase price for Shares repurchased pursuant to the
Restricted Stock Purchase Agreement shall be the original price paid by the
purchaser and may be paid by cancellation of any indebtedness of the purchaser
to the Company. The repurchase option shall lapse at a rate determined by the
Administrator.

            (c) Other Provisions. The Restricted Stock Purchase Agreement shall
contain such other terms, provisions and conditions not inconsistent with the
Plan as may be determined by the Administrator in its sole discretion.

            (d) Rights as a Stockholder. Once the Stock Purchase Right is
exercised, the purchaser shall have the rights equivalent to those of a
stockholder, and shall be a stockholder when

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his or her purchase is entered upon the records of the duly authorized transfer
agent of the Company. No adjustment will be made for a dividend or other right
for which the record date is prior to the date the Stock Purchase Right is
exercised, except as provided in Section 13 of the Plan.

      12. Non-Transferability of Options and Stock Purchase Rights. Unless
determined otherwise by the Administrator, an Option or Stock Purchase Right may
not be sold, pledged, assigned, hypothecated, transferred, or disposed of in any
manner other than by will or by the laws of descent or distribution and may be
exercised, during the lifetime of the Optionee, only by the Optionee. If the
Administrator makes an Option or Stock Purchase Right transferable, such Option
or Stock Purchase Right shall contain such additional terms and conditions as
the Administrator deems appropriate.

      13. Adjustments Upon Changes in Capitalization, Dissolution, Merger or
Asset Sale.

            (a) Changes in Capitalization. Subject to any required action by the
stockholders of the Company, the number of shares of Common Stock covered by
each outstanding Option and Stock Purchase Right, and the number of shares of
Common Stock which have been authorized for issuance under the Plan but as to
which no Options or Stock Purchase Rights have yet been granted or which have
been returned to the Plan upon cancellation or expiration of an Option or Stock
Purchase Right, as well as the price per share of Common Stock covered by each
such outstanding Option or Stock Purchase Right, shall be proportionately
adjusted for any increase or decrease in the number of issued shares of Common
Stock resulting from a stock split, reverse stock split, stock dividend,
combination or reclassification of the Common Stock, or any other increase or
decrease in the number of issued shares of Common Stock effected without receipt
of consideration by the Company; provided, however, that conversion of any
convertible securities of the Company shall not be deemed to have been "effected
without receipt of consideration." Such adjustment shall be made by the Board,
whose determination in that respect shall be final, binding and conclusive.
Except as expressly provided herein, no issuance by the Company of shares of
stock of any class, or securities convertible into shares of stock of any class,
shall affect, and no adjustment by reason thereof shall be made with respect to,
the number or price of shares of Common Stock subject to an Option or Stock
Purchase Right.

            (b) Dissolution or Liquidation. In the event of the proposed
dissolution or liquidation of the Company, the Administrator shall notify each
Optionee as soon as practicable prior to the effective date of such proposed
transaction. The Administrator in its discretion may provide for an Optionee to
have the right to exercise his or her Option until ten (10) days prior to such
transaction as to all of the Optioned Stock covered thereby, including Shares as
to which the Option would not otherwise be exercisable. In addition, the
Administrator may provide that any Company repurchase option applicable to any
Shares purchased upon exercise of an Option or Stock Purchase Right shall lapse
as to all such Shares, provided the proposed dissolution or liquidation takes
place at the time and in the manner contemplated. To the extent it has not been
previously exercised, an Option or Stock Purchase Right will terminate
immediately prior to the consummation of such proposed action.

            (c) Merger or Asset Sale. In the event of a merger of the Company
with or into another corporation, or the sale of substantially all of the assets
of the Company, each outstanding Option and Stock Purchase Right shall be
assumed or an equivalent option or right substituted by the

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successor corporation or a Parent or Subsidiary of the successor corporation. In
the event that the successor corporation refuses to assume or substitute for the
Option or Stock Purchase Right, the Optionee shall fully vest in and have the
right to exercise the Option or Stock Purchase Right as to all of the Optioned
Stock, including Shares as to which it would not otherwise be vested or
exercisable. If an Option or Stock Purchase Right becomes fully vested and
exercisable in lieu of assumption or substitution in the event of a merger or
sale of assets, the Administrator shall notify the Optionee in writing or
electronically that the Option or Stock Purchase Right shall be fully vested and
exercisable for a period of fifteen (15) days from the date of such notice, and
the Option or Stock Purchase Right shall terminate upon the expiration of such
period. For the purposes of this paragraph, the Option or Stock Purchase Right
shall be considered assumed if, following the merger or sale of assets, the
option or right confers the right to purchase or receive, for each Share of
Optioned Stock subject to the Option or Stock Purchase Right immediately prior
to the merger or sale of assets, the consideration (whether stock, cash, or
other securities or property) received in the merger or sale of assets by
holders of Common Stock for each Share held on the effective date of the
transaction (and if holders were offered a choice of consideration, the type of
consideration chosen by the holders of a majority of the outstanding Shares);
provided, however, that if such consideration received in the merger or sale of
assets is not solely common stock of the successor corporation or its Parent,
the Administrator may, with the consent of the successor corporation, provide
for the consideration to be received upon the exercise of the Option or Stock
Purchase Right, for each Share of Optioned Stock subject to the Option or Stock
Purchase Right, to be solely common stock of the successor corporation or its
Parent equal in fair market value to the per share consideration received by
holders of Common Stock in the merger or sale of assets.

      14. Date of Grant. The date of grant of an Option or Stock Purchase Right
shall be, for all purposes, the date on which the Administrator makes the
determination granting such Option or Stock Purchase Right, or such other later
date as is determined by the Administrator. Notice of the determination shall be
provided to each Optionee within a reasonable time after the date of such grant.

      15. Amendment and Termination of the Plan.

            (a) Amendment and Termination. The Board may at any time amend,
alter, suspend or terminate the Plan.

            (b) Stockholder Approval. The Company shall obtain stockholder
approval of any Plan amendment to the extent necessary and desirable to comply
with Applicable Laws.

            (c) Effect of Amendment or Termination. No amendment, alteration,
suspension or termination of the Plan shall impair the rights of any Optionee,
unless mutually agreed otherwise between the Optionee and the Administrator,
which agreement must be in writing and signed by the Optionee and the Company.
Termination of the Plan shall not affect the Administrator's ability to exercise
the powers granted to it hereunder with respect to Options granted under the
Plan prior to the date of such termination.

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      16. Conditions Upon Issuance of Shares.

            (a) Legal Compliance. Shares shall not be issued pursuant to the
exercise of an Option or Stock Purchase Right unless the exercise of such Option
or Stock Purchase Right and the issuance and delivery of such Shares shall
comply with Applicable Laws and shall be further subject to the approval of
counsel for the Company with respect to such compliance.

            (b) Investment Representations. As a condition to the exercise of an
Option or Stock Purchase Right, the Company may require the person exercising
such Option or Stock Purchase Right to represent and warrant at the time of any
such exercise that the Shares are being purchased only for investment and
without any present intention to sell or distribute such Shares if, in the
opinion of counsel for the Company, such a representation is required.

      17. Inability to Obtain Authority. The inability of the Company to obtain
authority from any regulatory body having jurisdiction, which authority is
deemed by the Company's counsel to be necessary to the lawful issuance and sale
of any Shares hereunder, shall relieve the Company of any liability in respect
of the failure to issue or sell such Shares as to which such requisite authority
shall not have been obtained.

      18. Reservation of Shares. The Company, during the term of this Plan, will
at all times reserve and keep available such number of Shares as shall be
sufficient to satisfy the requirements of the Plan.

      19. Stockholder Approval. The Plan shall be subject to approval by the
stockholders of the Company within twelve (12) months after the date the Plan is
adopted. Such stockholder approval shall be obtained in the manner and to the
degree required under Applicable Laws.

                                      -12-
<PAGE>   13
[KABIRA LOGO]

                            KABIRA TECHNOLOGIES, INC.
                                 2000 STOCK PLAN

                          NOTICE OF STOCK OPTION GRANT

Unless otherwise defined herein, the terms defined in the Plan shall have the
same defined meanings in this Option Agreement.

You have been granted an option to purchase Common Stock of the Company, subject
to the terms and conditions of the Plan and this Option Agreement, as follows:

<TABLE>
<S>                                                  <C>
         OPTIONEE NAME:                              ____________________________________________

         Date of Grant:                              ____________________________________________

         Vesting Commencement Date:                  ____________________________________________

         Exercise Price per Share:                   $___________________________________________

         Total Number of Shares Granted:             ____________________________________________

         Total Exercise Price:                       $___________________________________________

         Type of Option:                             Incentive / Nonstatutory Stock Option

         Term/Expiration Date:                       ____________________________________________
</TABLE>

         Vesting Schedule:
         ----------------

         This Option may be exercised, in whole or in part, in accordance with
         the following schedule:

              25% OF THE SHARES SUBJECT TO THE OPTION SHALL VEST TWELVE MONTHS
              AFTER THE VESTING COMMENCEMENT DATE, AND 1/48 OF THE SHARES
              SUBJECT TO THE OPTION SHALL VEST EACH MONTH THEREAFTER, SUBJECT TO
              THE OPTIONEE CONTINUING TO BE A SERVICE PROVIDER ON SUCH DATES.

         Termination Period:
         ------------------

         This Option may be exercised for one month after Optionee ceases to be
         a Service Provider. Upon the death or Disability of the Optionee, this
         Option may be exercised for twelve months after Optionee ceases to be a
         Service Provider. In no event shall this Option be exercised later than
         the Term/Expiration Date as provided above.

By your signature and the signature of the Company's representative below, you
and the Company agree that this option is granted under and governed by the
terms and conditions of the 2000 Stock Plan and the Stock Option Agreement, both
of which are attached to and made a part of this document.

<TABLE>
<S>                                         <C>
OPTIONEE:                                   KABIRA TECHNOLOGIES, INC.

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

                                            Title:  Vice President - Finance
-----------------------------------               ------------------------------
Print Name
</TABLE>

                                      -1-
<PAGE>   14
[KABIRA LOGO]

                            KABIRA TECHNOLOGIES, INC.
                                 2000 STOCK PLAN

                             STOCK OPTION AGREEMENT

A.   GRANT OF OPTION.

     The Plan Administrator of the Company hereby grants to the Optionee named
in the Notice of Grant attached as Part I of this Agreement (the "Optionee") an
option (the "Option") to purchase the number of Shares, as set forth in the
Notice of Grant, at the exercise price per share set forth in the Notice of
Grant (the "Exercise Price"), subject to the terms and conditions of the Plan,
which is incorporated herein by reference. Subject to Section 15(c) of the Plan,
in the event of a conflict between the terms and conditions of the Plan and the
terms and conditions of this Option Agreement, the terms and conditions of the
Plan shall prevail.

     If designated in the Notice of Grant as an Incentive Stock Option ("ISO"),
this Option is intended to qualify as an Incentive Stock Option under Section
422 of the Code. However, if this Option is intended to be an Incentive Stock
Option, to the extent that it exceeds the $100,000 rule of Code Section 422(d)
it shall be treated as a Nonstatutory Stock Option ("NSO").

B.  EXERCISE OF OPTION.

     (a) Right to Exercise. This Option is exercisable during its term in
         accordance with the Vesting Schedule set out in the Notice of Grant and
         the applicable provisions of the Plan and this Option Agreement.

     (b) Method of Exercise. This Option is exercisable by delivery of an
         exercise notice, in the form attached as Exhibit A (the "Exercise
         Notice"), which shall state the election to exercise the Option, the
         number of Shares in respect of which the Option is being exercised (the
         "Exercised Shares"), and such other representations and agreements as
         may be required by the Company pursuant to the provisions of the Plan.
         The Exercise Notice shall be completed by the Optionee and delivered to
         the Vice President - Finance of the Company. The Exercise Notice shall
         be accompanied by payment of the aggregate Exercise Price as to all
         Exercised Shares. This Option shall be deemed to be exercised upon
         receipt by the Company of such fully executed Exercise Notice
         accompanied by such aggregate Exercise Price.

         No Shares shall be issued pursuant to the exercise of this Option
         unless such issuance and exercise complies with Applicable Laws.
         Assuming such compliance, for income tax purposes the Exercised Shares
         shall be considered transferred to the Optionee on the date the Option
         is exercised with respect to such Exercised Shares.

C.   NON-TRANSFERABILITY OF OPTION.

     This Option may not be transferred in any manner otherwise than by will or
by the laws of descent or distribution and may be exercised during the lifetime
of Optionee only by the Optionee. The terms of the Plan and this Option
Agreement shall be binding upon the executors, administrators, heirs, successors
and assigns of the Optionee.

                                      -2-

<PAGE>   15
D.   METHOD OF PAYMENT.

     Payment of the aggregate Exercise Price shall be by any of the following,
or a combination thereof, at the election of the Optionee:

     (a) cash or check; or

     (b) consideration received by the Company under a cashless exercise program
         implemented by the Company in connection with the Plan; or

     (c) surrender of other Shares which (i) in the case of Shares acquired upon
exercise of an option, have been owned by the Optionee for more than six (6)
months on the date of surrender, and (ii) have a Fair Market Value on the date
of surrender equal to the aggregate Exercise Price of the Exercised Shares.

E.   TERM OF OPTION.

     This Option may be exercised only within the term set out in the Notice of
Grant, and may be exercised during such term only in accordance with the Plan
and the terms of this Option Agreement.

F.   ACCELERATED VESTING

     If (i) the Company is subject to a "Change in Control" (as defined herein)
before the Optionee's status as a Service Provider is terminated and (ii) there
is an "Involuntary Termination" (as defined herein) with respect to the Optionee
within twelve (12) months following the Change in Control, this Option shall
immediately vest and become exercisable as to 100% of the then unvested Shares
subject to the Option.

     For purposes of this Option Agreement, "Involuntary Termination" shall mean
the termination of the Optionee's status as a Service Provider that occurs by
reason of the Optionee's involuntary dismissal or discharge by the Company for
reasons other than Misconduct, or the Optionee's voluntary resignation following
(A) a reduction in his or her level of cash compensation (including base salary
and participation in cash bonus or cash incentive program), but not the
substitution of substantially equivalent compensation, or (B) a relocation of
the Optionee'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 Optionee's consent.

     For purposes of this Option Agreement, "Misconduct" shall mean the
commission of any act of fraud, embezzlement or dishonesty by the Optionee, any
unauthorized use or disclosure by the Optionee of confidential information or
trade secrets of the Company (or any Parent or Subsidiary), or any other
intentional misconduct by the Optionee 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 other Service
Provider.

     For purposes of this Option Agreement, "Change in Control" shall mean: (i)
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
shareholders 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 (A) the continuing or surviving entity and (B) any direct or indirect
parent corporation of such continuing or surviving entity; or (ii) the sale,
transfer or other disposition of all or substantially all of the Company's
assets. Notwithstanding the foregoing, 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.

                                      -3-

<PAGE>   16
G.   TAX CONSEQUENCES.

     Some of the federal tax consequences relating to this Option, as of the
date of this Option, are set forth below. THIS SUMMARY IS NECESSARILY
INCOMPLETE, AND THE TAX LAWS AND REGULATIONS ARE SUBJECT TO CHANGE. THE OPTIONEE
SHOULD CONSULT A TAX ADVISER BEFORE EXERCISING THIS OPTION OR DISPOSING OF THE
SHARES.

H.   EXERCISING THE OPTION.

     1. Nonstatutory Stock Option. The Optionee may incur regular federal income
     tax liability upon exercise of a NSO. The Optionee will be treated as
     having received compensation income (taxable at ordinary income tax rates)
     equal to the excess, if any, of the Fair Market Value of the Exercised
     Shares on the date of exercise over their aggregate Exercise Price. If the
     Optionee is an Employee or a former Employee, the Company will be required
     to withhold from his or her compensation or collect from Optionee and pay
     to the applicable taxing authorities an amount in cash equal to a
     percentage of this compensation income at the time of exercise, and may
     refuse to honor the exercise and refuse to deliver Shares if such
     withholding amounts are not delivered at the time of exercise.

     2. Incentive Stock Option. If this Option qualifies as an ISO, the Optionee
     will have no regular federal income tax liability upon its exercise,
     although the excess, if any, of the Fair Market Value of the Exercised
     Shares on the date of exercise over their aggregate Exercise Price will be
     treated as an adjustment to alternative minimum taxable income for federal
     tax purposes and may subject the Optionee to alternative minimum tax in the
     year of exercise. In the event that the Optionee ceases to be an Employee
     but remains a Service Provider, any Incentive Stock Option of the Optionee
     that remains unexercised shall cease to qualify as an Incentive Stock
     Option and will be treated for tax purposes as a Nonstatutory Stock Option
     on the date three (3) months and one (1) day following such change of
     status.

     3. Disposition of Shares.

     (a) NSO. If the Optionee holds NSO Shares for at least one year, any gain
         realized on disposition of the Shares will be treated as long-term
         capital gain for federal income tax purposes.

     (b) ISO. If the Optionee holds ISO Shares for at least one year after
         exercise and two years after the grant date, any gain realized on
         disposition of the Shares will be treated as long-term capital gain for
         federal income tax purposes. If the Optionee disposes of ISO Shares
         within one year after exercise or two years after the grant date, any
         gain realized on such disposition will be treated as compensation
         income (taxable at ordinary income rates) to the extent of the excess,
         if any, of the lesser of (A) the difference between the Fair Market
         Value of the Shares acquired on the date of exercise and the aggregate
         Exercise Price, or (B) the difference between the sale price of such
         Shares and the aggregate Exercise Price. Any additional gain will be
         taxed as capital gain, short-term or long-term depending on the period
         that the ISO Shares were held.

     (c) Notice of Disqualifying Disposition of ISO Shares. If the Optionee
         sells or otherwise disposes of any of the Shares acquired pursuant to
         an ISO on or before the later of (i) two years after the grant date, or
         (ii) one year after the exercise date, the Optionee shall immediately
         notify the Company in writing of such disposition. The Optionee agrees
         that he or she may be subject to income tax withholding by the Company
         on the compensation income recognized from such early disposition of
         ISO Shares by payment in cash or out of the current earnings paid to
         the Optionee.

                                      -4-

<PAGE>   17

I.   ENTIRE AGREEMENT; GOVERNING LAW.

     The Plan is incorporated herein by reference. The Plan and this Option
Agreement constitute the entire agreement of the parties with respect to the
subject matter hereof and supersede in their entirety all prior undertakings and
agreements of the Company and Optionee with respect to the subject matter
hereof, and may not be modified adversely to the Optionee's interest except by
means of a writing signed by the Company and Optionee. This agreement is
governed by the internal substantive laws, but not the choice of law rules, of
California.

J.   NO GUARANTEE OF CONTINUED SERVICE.

OPTIONEE ACKNOWLEDGES AND AGREES THAT THE VESTING OF SHARES PURSUANT TO THE
VESTING SCHEDULE HEREOF IS EARNED ONLY BY CONTINUING AS A SERVICE PROVIDER AT
THE WILL OF THE COMPANY (AND NOT THROUGH THE ACT OF BEING HIRED, BEING GRANTED
AN OPTION OR PURCHASING SHARES HEREUNDER). OPTIONEE FURTHER ACKNOWLEDGES AND
AGREES THAT THIS AGREEMENT, THE TRANSACTIONS CONTEMPLATED HEREUNDER AND THE
VESTING SCHEDULE SET FORTH HEREIN DO NOT CONSTITUTE AN EXPRESS OR IMPLIED
PROMISE OF CONTINUED ENGAGEMENT AS A SERVICE PROVIDER FOR THE VESTING PERIOD,
FOR ANY PERIOD, OR AT ALL, AND SHALL NOT INTERFERE WITH OPTIONEE'S RIGHT OR THE
COMPANY'S RIGHT TO TERMINATE OPTIONEE'S RELATIONSHIP AS A SERVICE PROVIDER AT
ANY TIME, WITH OR WITHOUT CAUSE.

By your signature and the signature of the Company's representative on the
Notice of Option Grant, you and the Company agree that this Option is granted
under and governed by the terms and conditions of the Plan and this Option
Agreement. Optionee has reviewed the Plan and this Option Agreement in their
entirety, has had an opportunity to obtain the advice of counsel prior to
executing this Option Agreement and fully understands all provisions of the Plan
and Option Agreement. Optionee hereby agrees to accept as binding, conclusive
and final all decisions or interpretations of the Administrator upon any
questions relating to the Plan and Option Agreement. Optionee further agrees to
notify the Company upon any change in their residence address.

                                   -5-
<PAGE>   18
                            KABIRA TECHNOLOGIES, INC.
                                 2000 STOCK PLAN
                          NOTICE OF STOCK OPTION GRANT

Unless otherwise defined herein, the terms defined in the Plan shall have the
same defined meanings in this Option Agreement.

You have been granted an option to purchase Common Stock of the Company, subject
to the terms and conditions of the Plan and this Option Agreement, as follows:

<TABLE>
<CAPTION>
<S>                                                  <C>

         OPTIONEE NAME:                              ____________________________________________

         Date of Grant:                              ____________________________________________

         Vesting Commencement Date:                  ____________________________________________

         Exercise Price per Share:                   $___________________________________________

         Total Number of Shares Granted:             ____________________________________________

         Total Exercise Price:                       $___________________________________________

         Type of Option:                             Incentive / Nonstatutory Stock Option

         Term/Expiration Date:                       ____________________________________________
</TABLE>

         Vesting Schedule:

         This Option may be exercised, in whole or in part, in accordance with
the following schedule:

              25% OF THE SHARES SUBJECT TO THE OPTION SHALL VEST TWELVE MONTHS
              AFTER THE VESTING COMMENCEMENT DATE, AND 1/48 OF THE SHARES
              SUBJECT TO THE OPTION SHALL VEST EACH MONTH THEREAFTER, SUBJECT TO
              THE OPTIONEE CONTINUING TO BE A SERVICE PROVIDER ON SUCH DATES.

         Termination Period:

         This Option may be exercised for one month after Optionee ceases to be
         a Service Provider. Upon the death or Disability of the Optionee, this
         Option may be exercised for twelve months after Optionee ceases to be a
         Service Provider. In no event shall this Option be exercised later than
         the Term/Expiration Date as provided above.

By your signature and the signature of the Company's representative below, you
and the Company agree that this option is granted under and governed by the
terms and conditions of the 2000 Stock Plan and the Stock Option Agreement, both
of which are attached to and made a part of this document.

OPTIONEE:                                      KABIRA TECHNOLOGIES, INC.

_________________________________          By: _________________________________

_________________________________          Title:  Vice President - Finance
Print Name

                                      -1-

<PAGE>   19

                            KABIRA TECHNOLOGIES, INC.
                                 2000 STOCK PLAN

                             STOCK OPTION AGREEMENT

A.       GRANT OF OPTION.

         The Plan Administrator of the Company hereby grants to the Optionee
named in the Notice of Grant attached as Part I of this Agreement (the
"Optionee") an option (the "Option") to purchase the number of Shares, as set
forth in the Notice of Grant, at the exercise price per share set forth in the
Notice of Grant (the "Exercise Price"), subject to the terms and conditions of
the Plan, which is incorporated herein by reference. Subject to Section 15(c) of
the Plan, in the event of a conflict between the terms and conditions of the
Plan and the terms and conditions of this Option Agreement, the terms and
conditions of the Plan shall prevail.

         If designated in the Notice of Grant as an Incentive Stock Option
("ISO"), this Option is intended to qualify as an Incentive Stock Option under
Section 422 of the Code. However, if this Option is intended to be an Incentive
Stock Option, to the extent that it exceeds the $100,000 rule of Code Section
422(d) it shall be treated as a Nonstatutory Stock Option ("NSO").

B.       EXERCISE OF OPTION.

         (a)      Right to Exercise. This Option is exercisable during its term
                  in accordance with the Vesting Schedule set out in the Notice
                  of Grant and the applicable provisions of the Plan and this
                  Option Agreement.

         (b)      Method of Exercise. This Option is exercisable by delivery of
                  an exercise notice, in the form attached as Exhibit A (the
                  "Exercise Notice"), which shall state the election to exercise
                  the Option, the number of Shares in respect of which the
                  Option is being exercised (the "Exercised Shares"), and such
                  other representations and agreements as may be required by the
                  Company pursuant to the provisions of the Plan. The Exercise
                  Notice shall be completed by the Optionee and delivered to the
                  Vice President - Finance of the Company. The Exercise Notice
                  shall be accompanied by payment of the aggregate Exercise
                  Price as to all Exercised Shares. This Option shall be deemed
                  to be exercised upon receipt by the Company of such fully
                  executed Exercise Notice accompanied by such aggregate
                  Exercise Price.

                  No Shares shall be issued pursuant to the exercise of this
                  Option unless such issuance and exercise complies with
                  Applicable Laws. Assuming such compliance, for income tax
                  purposes the Exercised Shares shall be considered transferred
                  to the Optionee on the date the Option is exercised with
                  respect to such Exercised Shares.

C.       NON-TRANSFERABILITY OF OPTION.

                  This Option may not be transferred in any manner otherwise
than by will or by the laws of descent or distribution and may be exercised
during the lifetime of Optionee only by the Optionee. The terms of the Plan and
this Option Agreement shall be binding upon the executors, administrators,
heirs, successors and assigns of the Optionee.

                                      -2-

<PAGE>   20

D.       METHOD OF PAYMENT.

         Payment of the aggregate Exercise Price shall be by any of the
following, or a combination thereof, at the election of the Optionee:

          (a)     cash or check; or

          (b)     consideration received by the Company under a cashless
                  exercise program implemented by the Company in connection with
                  the Plan; or

          (c)     surrender of other Shares which (i) in the case of Shares
                  acquired upon exercise of an option, have been owned by the
                  Optionee for more than six (6) months on the date of
                  surrender, and (ii) have a Fair Market Value on the date of
                  surrender equal to the aggregate Exercise Price of the
                  Exercised Shares.

E.       TERM OF OPTION.

         This Option may be exercised only within the term set out in the Notice
of Grant, and may be exercised during such term only
in accordance with the Plan and the terms of this Option Agreement.

F.       ACCELERATED VESTING

         If (i) the Company is subject to a "Change in Control" (as defined
herein) before the Optionee's status as a Service Provider is terminated and
(ii) there is an "Involuntary Termination" (as defined herein) with respect to
the Optionee within twelve (12) months following the Change in Control, this
Option shall immediately vest and become exercisable as to 100% of the then
unvested Shares subject to the Option.

         For purposes of this Option Agreement, "Involuntary Termination" shall
mean the termination of the Optionee's status as a Service Provider that occurs
by reason of the Optionee's involuntary dismissal or discharge by the Company
for reasons other than Misconduct, or the Optionee's voluntary resignation
following (A) a reduction in his or her level of cash compensation (including
base salary and participation in cash bonus or cash incentive program), but not
the substitution of substantially equivalent compensation, or (B) a relocation
of the Optionee's place of employment by more than fifty (50) miles, (C) a
change in his or her position with the Company which materially reduces his or
her level of responsibility (but not a change resulting solely from the fact
that the Company is no longer an independent company), provided and only if such
change, reduction or relocation is effected by the Company without the
Optionee's consent.

         For purposes of this Option Agreement, "Misconduct" shall mean the
commission of any act of fraud, embezzlement or dishonesty by the Optionee, any
unauthorized use or disclosure by the Optionee of confidential information or
trade secrets of the Company (or any Parent or Subsidiary), or any other
intentional misconduct by the Optionee 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 other Service
Provider.

         For purposes of this Option Agreement, "Change in Control" shall mean:
(i) 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
shareholders 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 (A) the continuing or surviving entity and (B) any direct or indirect
parent corporation of such continuing or surviving entity; or (ii) the sale,
transfer or other disposition of all or substantially all of the Company's
assets. Notwithstanding the foregoing, 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.

                                      -3-

<PAGE>   21

G.       TAX CONSEQUENCES.

         Some of the federal tax consequences relating to this Option, as of the
date of this Option, are set forth below. THIS SUMMARY IS NECESSARILY
INCOMPLETE, AND THE TAX LAWS AND REGULATIONS ARE SUBJECT TO CHANGE. THE OPTIONEE
SHOULD CONSULT A TAX ADVISER BEFORE EXERCISING THIS OPTION OR DISPOSING OF THE
SHARES.

H.       EXERCISING THE OPTION.

1.       Nonstatutory Stock Option. The Optionee may incur regular federal
         income tax liability upon exercise of a NSO. The Optionee will be
         treated as having received compensation income (taxable at ordinary
         income tax rates) equal to the excess, if any, of the Fair Market Value
         of the Exercised Shares on the date of exercise over their aggregate
         Exercise Price. If the Optionee is an Employee or a former Employee,
         the Company will be required to withhold from his or her compensation
         or collect from Optionee and pay to the applicable taxing authorities
         an amount in cash equal to a percentage of this compensation income at
         the time of exercise, and may refuse to honor the exercise and refuse
         to deliver Shares if such withholding amounts are not delivered at the
         time of exercise.

2.       Incentive Stock Option. If this Option qualifies as an ISO, the
         Optionee will have no regular federal income tax liability upon its
         exercise, although the excess, if any, of the Fair Market Value of the
         Exercised Shares on the date of exercise over their aggregate Exercise
         Price will be treated as an adjustment to alternative minimum taxable
         income for federal tax purposes and may subject the Optionee to
         alternative minimum tax in the year of exercise. In the event that the
         Optionee ceases to be an Employee but remains a Service Provider, any
         Incentive Stock Option of the Optionee that remains unexercised shall
         cease to qualify as an Incentive Stock Option and will be treated for
         tax purposes as a Nonstatutory Stock Option on the date three (3)
         months and one (1) day following such change of status.

3.       DISPOSITION OF SHARES.

         (a)      NSO. If the Optionee holds NSO Shares for at least one year,
                  any gain realized on disposition of the Shares will be treated
                  as long-term capital gain for federal income tax purposes.

         (b)      ISO. If the Optionee holds ISO Shares for at least one year
                  after exercise and two years after the grant date, any gain
                  realized on disposition of the Shares will be treated as
                  long-term capital gain for federal income tax purposes. If the
                  Optionee disposes of ISO Shares within one year after exercise
                  or two years after the grant date, any gain realized on such
                  disposition will be treated as compensation income (taxable at
                  ordinary income rates) to the extent of the excess, if any, of
                  the lesser of (A) the difference between the Fair Market Value
                  of the Shares acquired on the date of exercise and the
                  aggregate Exercise Price, or (B) the difference between the
                  sale price of such Shares and the aggregate Exercise Price.
                  Any additional gain will be taxed as capital gain, short-term
                  or long-term depending on the period that the ISO Shares were
                  held.

         (c)      Notice of Disqualifying Disposition of ISO Shares. If the
                  Optionee sells or otherwise disposes of any of the Shares
                  acquired pursuant to an ISO on or before the later of (i) two
                  years after the grant date, or (ii) one year after the
                  exercise date, the Optionee shall immediately notify the
                  Company in writing of such disposition. The Optionee agrees
                  that he or she may be subject to income tax withholding by the
                  Company on the compensation income recognized from such early
                  disposition of ISO Shares by payment in cash or out of the
                  current earnings paid to the Optionee.

                                      -4-

<PAGE>   22

I. ENTIRE AGREEMENT; GOVERNING LAW.

         The Plan is incorporated herein by reference. The Plan and this Option
Agreement constitute the entire agreement of the parties with respect to the
subject matter hereof and supersede in their entirety all prior undertakings and
agreements of the Company and Optionee with respect to the subject matter
hereof, and may not be modified adversely to the Optionee's interest except by
means of a writing signed by the Company and Optionee. This agreement is
governed by the internal substantive laws, but not the choice of law rules, of
California.

J. NO GUARANTEE OF CONTINUED SERVICE.

OPTIONEE ACKNOWLEDGES AND AGREES THAT THE VESTING OF SHARES PURSUANT TO THE
VESTING SCHEDULE HEREOF IS EARNED ONLY BY CONTINUING AS A SERVICE PROVIDER AT
THE WILL OF THE COMPANY (AND NOT THROUGH THE ACT OF BEING HIRED, BEING GRANTED
AN OPTION OR PURCHASING SHARES HEREUNDER). OPTIONEE FURTHER ACKNOWLEDGES AND
AGREES THAT THIS AGREEMENT, THE TRANSACTIONS CONTEMPLATED HEREUNDER AND THE
VESTING SCHEDULE SET FORTH HEREIN DO NOT CONSTITUTE AN EXPRESS OR IMPLIED
PROMISE OF CONTINUED ENGAGEMENT AS A SERVICE PROVIDER FOR THE VESTING PERIOD,
FOR ANY PERIOD, OR AT ALL, AND SHALL NOT INTERFERE WITH OPTIONEE'S RIGHT OR THE
COMPANY'S RIGHT TO TERMINATE OPTIONEE'S RELATIONSHIP AS A SERVICE PROVIDER AT
ANY TIME, WITH OR WITHOUT CAUSE.

By your signature and the signature of the Company's representative on the
Notice of Option Grant, you and the Company agree that this Option is granted
under and governed by the terms and conditions of the Plan and this Option
Agreement. Optionee has reviewed the Plan and this Option Agreement in their
entirety, has had an opportunity to obtain the advice of counsel prior to
executing this Option Agreement and fully understands all provisions of the Plan
and Option Agreement. Optionee hereby agrees to accept as binding, conclusive
and final all decisions or interpretations of the Administrator upon any
questions relating to the Plan and Option Agreement. Optionee further agrees to
notify the Company upon any change in their residence address.

                                      -5-
<PAGE>   23

                                    EXHIBIT A

                            KABIRA TECHNOLOGIES, INC.

                                 2000 STOCK PLAN

                                 EXERCISE NOTICE

Kabira Technologies, Inc.
One McInnis Parkway
San Rafael, CA 94903

Attention:  [Title]

        1. Exercise of Option. Effective as of today, ________________, _____,
the undersigned ("Purchaser") hereby elects to purchase ______________ shares
(the "Shares") of the Common Stock of Kabira Technologies, Inc. (the "Company")
under and pursuant to the 2000 Stock Plan (the "Plan") and the Stock Option
Agreement dated, _____ (the "Option Agreement"). The purchase price for the
Shares shall be $_____, as required by the Option Agreement.

        2. Delivery of Payment. Purchaser herewith delivers to the Company the
full purchase price for the Shares.

        3. Representations of Purchaser. Purchaser acknowledges that Purchaser
has received, read and understood the Plan and the Option Agreement and agrees
to abide by and be bound by their terms and conditions.

        4. Rights as Shareholder. Until the issuance (as evidenced by the
appropriate entry on the books of the Company or of a duly authorized transfer
agent of the Company) of the Shares, no right to vote or receive dividends or
any other rights as a shareholder shall exist with respect to the Optioned
Stock, notwithstanding the exercise of the Option. The Shares so acquired shall
be issued to the Optionee as soon as practicable after exercise of the Option.
No adjustment will be made for a dividend or other right for which the record
date is prior to the date of issuance, except as provided in Section 13 of the
Plan.

        5. Tax Consultation. Purchaser understands that Purchaser may suffer
adverse tax consequences as a result of Purchaser's purchase or disposition of
the Shares. Purchaser represents that Purchaser has consulted with any tax
consultants Purchaser deems advisable in connection with the purchase or
disposition of the Shares and that Purchaser is not relying on the Company for
any tax advice.

<PAGE>   24

        6. Entire Agreement; Governing Law. The Plan and Option Agreement are
incorporated herein by reference. This Agreement, the Plan and the Option
Agreement constitute the entire agreement of the parties with respect to the
subject matter hereof and supersede in their entirety all prior undertakings and
agreements of the Company and Purchaser with respect to the subject matter
hereof, and may not be modified adversely to the Purchaser's interest except by
means of a writing signed by the Company and Purchaser. This Agreement is
governed by the internal substantive laws, but not the choice of law rules, of
California.

Submitted by:                             Accepted by:

PURCHASER:                                KABIRA TECHNOLOGIES, INC.

-------------------------------           -------------------------------------
Signature                                 By

-------------------------------           -------------------------------------
Print Name            Its

Address:                                  Address:

                                          One McInnis Parkway
-------------------------------           San Rafael, CA 94903

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

                                          --------------------------------------
                                          Date Received

                                      -2-<PAGE>   1
                                                                    EXHIBIT 10.7

                            KABIRA TECHNOLOGIES, INC.

                        2000 EMPLOYEE STOCK PURCHASE PLAN

          The following constitute the provisions of the 2000 Employee Stock
Purchase Plan of Kabira Technologies, Inc.

          1.   Purpose. The purpose of the Plan is to provide employees of the
Company and its Designated Subsidiaries with an opportunity to purchase Common
Stock of the Company through accumulated payroll deductions. It is the intention
of the Company to have the Plan qualify as an "Employee Stock Purchase Plan"
under Section 423 of the Internal Revenue Code of 1986, as amended. The
provisions of the Plan, accordingly, shall be construed so as to extend and
limit participation in a manner consistent with the requirements of that section
of the Code.

          2.   Definitions.

               (a) "Board" shall mean the Board of Directors of the Company or
any committee thereof designated by the Board of Directors of the Company in
accordance with Section 14 of the Plan.

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

               (c) "Common Stock" shall mean the common stock of the Company.

               (d) "Company" shall mean Kabira Technologies, Inc. and any
Designated Subsidiary of the Company.

               (e) "Compensation" shall mean all base gross earnings, bonuses,
and commissions, including payments for overtime, shift premium, incentive
compensation, incentive payments, bonuses and other compensation.

               (f) "Designated Subsidiary" shall mean any Subsidiary that has
been designated by the Board from time to time in its sole discretion as
eligible to participate in the Plan.

               (g) "Employee" shall mean any individual who is an Employee of
the Company for tax purposes whose customary employment with the Company is at
least twenty (20) hours per week and more than five (5) months in any calendar
year. For purposes of the Plan, the employment relationship shall be treated as
continuing intact while the individual is on sick leave or other leave of
absence approved by the Company. Where the period of leave exceeds 90 days and
the individual's right to reemployment is not guaranteed either by statute or by
contract, the employment relationship shall be deemed to have terminated on the
91st day of such leave.

               (h) "Enrollment Date" shall mean the first Trading Day of each
Offering Period.

               (i) "Exercise Date" shall mean the last Trading Day of each
Purchase Period.

               (j) "Fair Market Value" shall mean, as of any date, the value of
Common Stock determined as follows:

<PAGE>   2

                  (i) If the Common Stock is listed on any established stock
exchange or a national market system, including without limitation the Nasdaq
National Market or The Nasdaq SmallCap Market of The Nasdaq Stock Market, its
Fair Market Value shall be the closing sales price for such stock (or the
closing bid, if no sales were reported) as quoted on such exchange or system for
the last market trading day prior to the date of determination, as reported in
The Wall Street Journal or such other source as the Board deems reliable;

                  (ii) If the Common Stock is regularly quoted by a recognized
securities dealer but selling prices are not reported, its Fair Market Value
shall be the mean of the closing bid and asked prices for the Common Stock prior
to the date of determination, as reported in The Wall Street Journal or such
other source as the Board deems reliable;

                  (iii) In the absence of an established market for the Common
Stock, the Fair Market Value thereof shall be determined in good faith by the
Board; or

                  (iv) For purposes of the Enrollment Date of the first Offering
Period under the Plan, the Fair Market Value shall be the initial price to the
public as set forth in the final prospectus included within the registration
statement in Form S-1 filed with the Securities and Exchange Commission for the
initial public offering of the Company's Common Stock (the "Registration
Statement").

               (k) "Offering Periods" shall mean the periods of approximately
twenty-four (24) months during which an option granted pursuant to the Plan may
be exercised, commencing on the first Trading Day on or after February 1 and
August 1 of each year and terminating on the last Trading Day in the periods
ending twenty-four months later; provided, however, that the first Offering
Period under the Plan shall commence with the first Trading Day on or after the
date on which the Securities and Exchange Commission declares the Company's
Registration Statement effective and ending on the last Trading Day on or before
July 31, 2002. The duration and timing of Offering Periods may be changed
pursuant to Section 4 of this Plan.

               (l) "Plan" shall mean this 2000 Employee Stock Purchase Plan.

               (m) "Purchase Period" shall mean the approximately six month
period commencing after one Exercise Date and ending with the next Exercise
Date, except that the first Purchase Period of any Offering Period shall
commence on the Enrollment Date and end with the next Exercise Date.

               (n) "Purchase Price" shall mean 85% of the Fair Market Value of a
share of Common Stock on the Enrollment Date or on the Exercise Date, whichever
is lower; provided however, that the Purchase Price may be adjusted by the Board
pursuant to Section 20.

               (o) "Reserves" shall mean the number of shares of Common Stock
covered by each option under the Plan which have not yet been exercised and the
number of shares of Common Stock which have been authorized for issuance under
the Plan but not yet placed under option.

               (p) "Subsidiary" shall mean a corporation, domestic or foreign,
of which not less than 50% of the voting shares are held by the Company or a
Subsidiary, whether or not such corporation now exists or is hereafter organized
or acquired by the Company or a Subsidiary.

               (q) "Trading Day" shall mean a day on which national stock
exchanges and the Nasdaq System are open for trading.

                                      -2-

<PAGE>   3

          3.   Eligibility.

               (a) Any Employee who shall be employed by the Company on a given
Enrollment Date shall be eligible to participate in the Plan.

               (b) Any provisions of the Plan to the contrary notwithstanding,
no Employee shall be granted an option under the Plan (i) to the extent that,
immediately after the grant, such Employee (or any other person whose stock
would be attributed to such Employee pursuant to Section 424(d) of the Code)
would own capital stock of the Company and/or hold outstanding options to
purchase such stock possessing five percent (5%) or more of the total combined
voting power or value of all classes of the capital stock of the Company or of
any Subsidiary, or (ii) to the extent that his or her rights to purchase stock
under all employee stock purchase plans of the Company and its subsidiaries
accrues at a rate which exceeds Twenty-Five Thousand Dollars ($25,000) worth of
stock (determined at the fair market value of the shares at the time such option
is granted) for each calendar year in which such option is outstanding at any
time.

          4.   Offering Periods. The Plan shall be implemented by consecutive,
overlapping Offering Periods with a new Offering Period commencing on the first
Trading Day on or after February 1 and August 1 each year, or on such other date
as the Board shall determine, and continuing thereafter until terminated in
accordance with Section 20 hereof; provided, however, that the first Offering
Period under the Plan shall commence with the first Trading Day on or after the
date on which the Securities and Exchange Commission declares the Company's
Registration Statement effective and ending on the last Trading Day on or before
July 31, 2002. The Board shall have the power to change the duration of Offering
Periods (including the commencement dates thereof) with respect to future
offerings without shareholder approval if such change is announced at least five
(5) days prior to the scheduled beginning of the first Offering Period to be
affected thereafter.

          5.   Participation.

               (a) An eligible Employee may become a participant in the Plan by
completing a subscription agreement authorizing payroll deductions in the form
of Exhibit A to this Plan and filing it with the Company's payroll office prior
to the applicable Enrollment Date.

               (b) Payroll deductions for a participant shall commence on the
first payroll following the Enrollment Date and shall end on the last payroll in
the Offering Period to which such authorization is applicable, unless sooner
terminated by the participant as provided in Section 10 hereof.

          6.   Payroll Deductions.

               (a) At the time a participant files his or her subscription
agreement, he or she shall elect to have payroll deductions made on each pay day
during the Offering Period in an amount not exceeding fifteen percent (15%) of
the Compensation which he or she receives on each pay day during the Offering
Period.

               (b) All payroll deductions made for a participant shall be
credited to his or her account under the Plan and shall be withheld in whole
percentages only. A participant may not make any additional payments into such
account.

               (c) A participant may discontinue his or her participation in the
Plan as provided in Section 10 hereof, or may increase or decrease the rate of
his or her payroll deductions during the Offering Period by completing or filing
with the Company a new subscription agreement authorizing a change in

                                      -3-

<PAGE>   4

payroll deduction rate. The Board may, in its discretion, limit the number of
participation rate changes during any Offering Period. The change in rate shall
be effective with the first full payroll period following five (5) business days
after the Company's receipt of the new subscription agreement unless the Company
elects to process a given change in participation more quickly. A participant's
subscription agreement shall remain in effect for successive Offering Periods
unless terminated as provided in Section 10 hereof.

               (d) Notwithstanding the foregoing, to the extent necessary to
comply with Section 423(b)(8) of the Code and Section 3(b) hereof, a
participant's payroll deductions may be decreased to zero percent (0%) at any
time during a Purchase Period. Payroll deductions shall recommence at the rate
provided in such participant's subscription agreement at the beginning of the
first Purchase Period which is scheduled to end in the following calendar year,
unless terminated by the participant as provided in Section 10 hereof.

               (e) At the time the option is exercised, in whole or in part, or
at the time some or all of the Company's Common Stock issued under the Plan is
disposed of, the participant must make adequate provision for the Company's
federal, state, or other tax withholding obligations, if any, which arise upon
the exercise of the option or the disposition of the Common Stock. At any time,
the Company may, but shall not be obligated to, withhold from the participant's
compensation the amount necessary for the Company to meet applicable withholding
obligations, including any withholding required to make available to the Company
any tax deductions or benefits attributable to sale or early disposition of
Common Stock by the Employee.

          7.   Grant of Option. On the Enrollment Date of each Offering Period,
each eligible Employee participating in such Offering Period shall be granted an
option to purchase on each Exercise Date during such Offering Period (at the
applicable Purchase Price) up to a number of shares of the Company's Common
Stock determined by dividing such Employee's payroll deductions accumulated
prior to such Exercise Date and retained in the Participant's account as of the
Exercise Date by the applicable Purchase Price; provided that in no event shall
an Employee be permitted to purchase during each Purchase Period more than
10,000 shares of the Company's Common Stock (subject to any adjustment pursuant
to Section 19), and provided further that such purchase shall be subject to the
limitations set forth in Sections 3(b) and 12 hereof. The Board may, for future
Offering Periods, increase or decrease, in its absolute discretion, the maximum
number of shares of the Company's Common Stock an Employee may purchase during
each Purchase Period of such Offering Period. Exercise of the option shall occur
as provided in Section 8 hereof, unless the participant has withdrawn pursuant
to Section 10 hereof. The option shall expire on the last day of the Offering
Period.

          8.   Exercise of Option.

               (a) Unless a participant withdraws from the Plan as provided in
Section 10 hereof, his or her option for the purchase of shares shall be
exercised automatically on the Exercise Date, and the maximum number of full
shares subject to option shall be purchased for such participant at the
applicable Purchase Price with the accumulated payroll deductions in his or her
account. No fractional shares shall be purchased; any payroll deductions
accumulated in a participant's account which are not sufficient to purchase a
full share shall be retained in the participant's account for the subsequent
Purchase Period or Offering Period, subject to earlier withdrawal by the
participant as provided in Section 10 hereof. Any other monies left over in a
participant's account after the Exercise Date shall be returned to the
participant. During a participant's lifetime, a participant's option to purchase
shares hereunder is exercisable only by him or her.

               (b) If the Board determines that, on a given Exercise Date, the
number of shares with respect to which options are to be exercised may exceed
(i) the number of shares of Common Stock that were available for sale under the
Plan on the Enrollment Date of the applicable Offering Period, or (ii) the
number of shares available for sale under the Plan on such Exercise Date, the
Board may in its sole discretion (x) provide that the Company shall make a pro
rata allocation of the shares of Common Stock available for

                                      -4-

<PAGE>   5

purchase on such Enrollment Date or Exercise Date, as applicable, in as uniform
a manner as shall be practicable and as it shall determine in its sole
discretion to be equitable among all participants exercising options to purchase
Common Stock on such Exercise Date, and continue all Offering Periods then in
effect, or (y) provide that the Company shall make a pro rata allocation of the
shares available for purchase on such Enrollment Date or Exercise Date, as
applicable, in as uniform a manner as shall be practicable and as it shall
determine in its sole discretion to be equitable among all participants
exercising options to purchase Common Stock on such Exercise Date, and terminate
any or all Offering Periods then in effect pursuant to Section 20 hereof. The
Company may make pro rata allocation of the shares available on the Enrollment
Date of any applicable Offering Period pursuant to the preceding sentence,
notwithstanding any authorization of additional shares for issuance under the
Plan by the Company's shareholders subsequent to such Enrollment Date.

          9.   Delivery. As promptly as practicable after each Exercise Date
on which a purchase of shares occurs, the Company shall arrange the delivery to
each participant, as appropriate, of a certificate representing the shares
purchased upon exercise of his or her option.

          10.  Withdrawal.

               (a) A participant may withdraw all but not less than all the
payroll deductions credited to his or her account and not yet used to exercise
his or her option under the Plan at any time by giving written notice to the
Company in the form of Exhibit B to this Plan. All of the participant's payroll
deductions credited to his or her account shall be paid to such participant
promptly after receipt of notice of withdrawal and such participant's option for
the Offering Period shall be automatically terminated, and no further payroll
deductions for the purchase of shares shall be made for such Offering Period. If
a participant withdraws from an Offering Period, payroll deductions shall not
resume at the beginning of the succeeding Offering Period unless the participant
delivers to the Company a new subscription agreement.

               (b) A participant's withdrawal from an Offering Period shall not
have any effect upon his or her eligibility to participate in any similar plan
which may hereafter be adopted by the Company or in succeeding Offering Periods
which commence after the termination of the Offering Period from which the
participant withdraws.

          11.  Termination of Employment.

               Upon a participant's ceasing to be an Employee, for any reason,
he or she shall be deemed to have elected to withdraw from the Plan and the
payroll deductions credited to such participant's account during the Offering
Period but not yet used to exercise the option shall be returned to such
participant or, in the case of his or her death, to the person or persons
entitled thereto under Section 15 hereof, and such participant's option shall be
automatically terminated. The preceding sentence notwithstanding, a participant
who receives payment in lieu of notice of termination of employment shall be
treated as continuing to be an Employee for the participant's customary number
of hours per week of employment during the period in which the participant is
subject to such payment in lieu of notice.

          12.  Interest. No interest shall accrue on the payroll deductions
of a participant in the Plan.

          13.  Stock.

               (a) Subject to adjustment upon changes in capitalization of the
Company as provided in Section 19 hereof, the maximum number of shares of the
Company's Common Stock which shall be made available for sale under the Plan
shall be 1,000,000 shares, plus an annual increase to be added on the first day

                                      -5-

<PAGE>   6

of the Company's fiscal year beginning in 2001, equal to the least of (i)
1,000,000 shares, (ii) 1.5% of the outstanding shares on such date, and (iii) a
lesser amount determined by the Board.

               (b) The participant shall have no interest or voting right in
shares covered by his option until such option has been exercised.

               (c) Shares to be delivered to a participant under the Plan shall
be registered in the name of the participant or in the name of the participant
and his or her spouse.

          14.  Administration. The Plan shall be administered by the Board
or a committee of members of the Board appointed by the Board. The Board or its
committee shall have full and exclusive discretionary authority to construe,
interpret and apply the terms of the Plan, to determine eligibility and to
adjudicate all disputed claims filed under the Plan. Every finding, decision and
determination made by the Board or its committee shall, to the full extent
permitted by law, be final and binding upon all parties.

          15.  Designation of Beneficiary.

               (a) A participant may file a written designation of a beneficiary
who is to receive any shares and cash, if any, from the participant's account
under the Plan in the event of such participant's death subsequent to an
Exercise Date on which the option is exercised but prior to delivery to such
participant of such shares and cash. In addition, a participant may file a
written designation of a beneficiary who is to receive any cash from the
participant's account under the Plan in the event of such participant's death
prior to exercise of the option. If a participant is married and the designated
beneficiary is not the spouse, spousal consent shall be required for such
designation to be effective.

               (b) Such designation of beneficiary may be changed by the
participant at any time by written notice. In the event of the death of a
participant and in the absence of a beneficiary validly designated under the
Plan who is living at the time of such participant's death, the Company shall
deliver such shares and/or cash to the executor or administrator of the estate
of the participant, or if no such executor or administrator has been appointed
(to the knowledge of the Company), the Company, in its discretion, may deliver
such shares and/or cash to the spouse or to any one or more dependents or
relatives of the participant, or if no spouse, dependent or relative is known to
the Company, then to such other person as the Company may designate.

          16.  Transferability. Neither payroll deductions credited to a
participant's account nor any rights with regard to the exercise of an option or
to receive shares under the Plan may be assigned, transferred, pledged or
otherwise disposed of in any way (other than by will, the laws of descent and
distribution or as provided in Section 15 hereof) by the participant. Any such
attempt at assignment, transfer, pledge or other disposition shall be without
effect, except that the Company may treat such act as an election to withdraw
funds from an Offering Period in accordance with Section 10 hereof.

          17.  Use of Funds. All payroll deductions received or held by the
Company under the Plan may be used by the Company for any corporate purpose, and
the Company shall not be obligated to segregate such payroll deductions.

          18.  Reports. Individual accounts shall be maintained for each
participant in the Plan. Statements of account shall be given to participating
Employees at least annually, which statements shall set forth the amounts of
payroll deductions, the Purchase Price, the number of shares purchased and the
remaining cash balance, if any.

                                      -6-

<PAGE>   7

          19.  Adjustments Upon Changes in Capitalization, Dissolution,
Liquidation, Merger or Asset Sale.

               (a) Changes in Capitalization. Subject to any required action by
the shareholders of the Company, the Reserves, the maximum number of shares each
participant may purchase each Purchase Period (pursuant to Section 7), as well
as the price per share and the number of shares of Common Stock covered by each
option under the Plan which has not yet been exercised shall be proportionately
adjusted for any increase or decrease in the number of issued shares of Common
Stock resulting from a stock split, reverse stock split, stock dividend,
combination or reclassification of the Common Stock, or any other increase or
decrease in the number of shares of Common Stock effected without receipt of
consideration by the Company; provided, however, that conversion of any
convertible securities of the Company shall not be deemed to have been "effected
without receipt of consideration." Such adjustment shall be made by the Board,
whose determination in that respect shall be final, binding and conclusive.
Except as expressly provided herein, no issuance by the Company of shares of
stock of any class, or securities convertible into shares of stock of any class,
shall affect, and no adjustment by reason thereof shall be made with respect to,
the number or price of shares of Common Stock subject to an option.

               (b) Dissolution or Liquidation. In the event of the proposed
dissolution or liquidation of the Company, the Offering Period then in progress
shall be shortened by setting a new Exercise Date (the "New Exercise Date"), and
shall terminate immediately prior to the consummation of such proposed
dissolution or liquidation, unless provided otherwise by the Board. The New
Exercise Date shall be before the date of the Company's proposed dissolution or
liquidation. The Board shall notify each participant in writing, at least ten
(10) business days prior to the New Exercise Date, that the Exercise Date for
the participant's option has been changed to the New Exercise Date and that the
participant's option shall be exercised automatically on the New Exercise Date,
unless prior to such date the participant has withdrawn from the Offering Period
as provided in Section 10 hereof.

               (c) Merger or Asset Sale. In the event of a proposed sale of all
or substantially all of the assets of the Company, or the merger of the Company
with or into another corporation, each outstanding option shall be assumed or an
equivalent option substituted by the successor corporation or a Parent or
Subsidiary of the successor corporation. In the event that the successor
corporation refuses to assume or substitute for the option, any Purchase Periods
then in progress shall be shortened by setting a new Exercise Date (the "New
Exercise Date") and any Offering Periods then in progress shall end on the New
Exercise Date. The New Exercise Date shall be before the date of the Company's
proposed sale or merger. The Board shall notify each participant in writing, at
least ten (10) business days prior to the New Exercise Date, that the Exercise
Date for the participant's option has been changed to the New Exercise Date and
that the participant's option shall be exercised automatically on the New
Exercise Date, unless prior to such date the participant has withdrawn from the
Offering Period as provided in Section 10 hereof.

          20.  Amendment or Termination.

               (a) The Board of Directors of the Company may at any time and for
any reason terminate or amend the Plan. Except as provided in Section 19 hereof,
no such termination can affect options previously granted, provided that an
Offering Period may be terminated by the Board of Directors on any Exercise Date
if the Board determines that the termination of the Offering Period or the Plan
is in the best interests of the Company and its shareholders. Except as provided
in Section 19 and this Section 20 hereof, no amendment may make any change in
any option theretofore granted which adversely affects the rights of any
participant. To the extent necessary to comply with Section 423 of the Code (or
any successor rule or provision or any other applicable law, regulation or stock
exchange rule), the Company shall obtain shareholder approval in such a manner
and to such a degree as required.

                                      -7-

<PAGE>   8

               (b) Without shareholder consent and without regard to whether any
participant rights may be considered to have been "adversely affected," the
Board (or its committee) shall be entitled to change the Offering Periods, limit
the frequency and/or number of changes in the amount withheld during an Offering
Period, establish the exchange ratio applicable to amounts withheld in a
currency other than U.S. dollars, permit payroll withholding in excess of the
amount designated by a participant in order to adjust for delays or mistakes in
the Company's processing of properly completed withholding elections, establish
reasonable waiting and adjustment periods and/or accounting and crediting
procedures to ensure that amounts applied toward the purchase of Common Stock
for each participant properly correspond with amounts withheld from the
participant's Compensation, and establish such other limitations or procedures
as the Board (or its committee) determines in its sole discretion advisable
which are consistent with the Plan.

               (c) In the event the Board determines that the ongoing operation
of the Plan may result in unfavorable financial accounting consequences, the
Board may, in its discretion and, to the extent necessary or desirable, modify
or amend the Plan to reduce or eliminate such accounting consequence including,
but not limited to:

                  (i) altering the Purchase Price for any Offering Period
including an Offering Period underway at the time of the change in Purchase
Price;

                  (ii) shortening any Offering Period so that Offering Period
ends on a new Exercise Date, including an Offering Period underway at the time
of the Board action; and

                  (iii) allocating shares.

               Such modifications or amendments shall not require stockholder
approval or the consent of any Plan participants.

          21.  Notices. All notices or other communications by a participant to
the Company under or in connection with the Plan shall be deemed to have been
duly given when received in the form specified by the Company at the location,
or by the person, designated by the Company for the receipt thereof.

          22.  Conditions Upon Issuance of Shares. Shares shall not be issued
with respect to an option unless the exercise of such option and the issuance
and delivery of such shares pursuant thereto shall comply with all applicable
provisions of law, domestic or foreign, including, without limitation, the
Securities Act of 1933, as amended, the Securities Exchange Act of 1934, as
amended, the rules and regulations promulgated thereunder, and the requirements
of any stock exchange upon which the shares may then be listed, and shall be
further subject to the approval of counsel for the Company with respect to such
compliance.

               As a condition to the exercise of an option, the Company may
require the person exercising such option to represent and warrant at the time
of any such exercise that the shares are being purchased only for investment and
without any present intention to sell or distribute such shares if, in the
opinion of counsel for the Company, such a representation is required by any of
the aforementioned applicable provisions of law.

          23.  Term of Plan. The Plan shall become effective upon the earlier to
occur of its adoption by the Board of Directors or its approval by the
shareholders of the Company. It shall continue in effect for a term of ten (10)
years unless sooner terminated under Section 20 hereof.

          24.  Automatic Transfer to Low Price Offering Period. To the extent
permitted by any applicable laws, regulations, or stock exchange rules if the
Fair Market Value of the Common Stock on any Exercise Date in an Offering Period
is lower than the Fair Market Value of the Common Stock on the Enrollment Date
of such Offering Period, then all participants in such Offering Period shall be
automatically withdrawn from such Offering Period immediately after the exercise
of their option on such Exercise Date and automatically re-enrolled in the
immediately following Offering Period as of the first day thereof.

                                      -8-

<PAGE>   9
                                              PLEASE SUBMIT THIS FORM, VIA FAX,
                                              TO BENEFITS ADMINISTRATOR AT
                                              415-446-5197

                                    EXHIBIT A

                            KABIRA TECHNOLOGIES, INC.
                        2000 EMPLOYEE STOCK PURCHASE PLAN
                             SUBSCRIPTION AGREEMENT

   _______  ORIGINAL APPLICATION               ENROLLMENT DATE: _______________
   _______  CHANGE IN PAYROLL DEDUCTION RATE
   _______  CHANGE OF BENEFICIARY(IES)

1.       ____________________ hereby elects to participate in the Kabira
         Technologies, Inc. Employee Stock Purchase Plan (the "Employee Stock
         Purchase Plan") and subscribes to purchase shares of the Company's
         Common Stock in accordance with this Subscription Agreement and the
         Employee Stock Purchase Plan.

2.       I hereby authorize payroll deductions from each paycheck in the amount
         of ____% of my Compensation on each payday (from 0 to 15%) during the
         Offering Period in accordance with the Employee Stock Purchase Plan.
         (Please note that no fractional percentages are permitted.)

              PLEASE NOTE: IF YOU WISH TO PARTICIPATE IN THE FIRST OFFERING
              PERIOD UNDER THIS PLAN, YOU WILL BE REQUIRED TO CONFIRM YOUR
              ELECTION TO PARTICIPATE WITHIN THREE BUSINESS DAYS AFTER THE
              EFFECTIVE DATE OF THE REGISTRATION STATEMENT RELATING TO THE
              COMPANY'S INITIAL PUBLIC OFFERING. YOU WILL RECEIVE A WRITTEN OR
              E-MAIL MESSAGE REQUESTING CONFIRMATION. IF YOU DO NOT RESPOND
              AFFIRMATIVELY WITHIN THE SPECIFIED PERIOD, YOU WILL NOT BE
              ELIGIBLE TO PARTICIPATE IN THE INITIAL OFFERING PERIOD.

3.       I understand that said payroll deductions shall be accumulated for the
         purchase of shares of Common Stock at the applicable Purchase Price
         determined in accordance with the Employee Stock Purchase Plan. I
         understand that if I do not withdraw from an Offering Period, any
         accumulated payroll deductions will be used to automatically exercise
         my option.

4.       I have received a copy of the complete Employee Stock Purchase Plan. I
         understand that my participation in the Employee Stock Purchase Plan is
         in all respects subject to the terms of the Plan. I understand that my
         ability to exercise the option under this Subscription Agreement is
         subject to shareholder approval of the Employee Stock Purchase Plan.

5.       Shares purchased for me under the Employee Stock Purchase Plan should
         be issued in the name(s) of (Employee or Employee and Spouse only).

6.       I understand that if I dispose of any shares received by me pursuant to
         the Plan within 2 years after the Enrollment Date (the first day of the
         Offering Period during which I purchased such shares) or one year after
         the Exercise Date, I will be treated for federal income tax purposes as
         having received ordinary income at the time of such disposition in an
         amount equal to the excess of the fair market value of the shares at
         the time such shares were purchased by me over the price which I paid
         for the shares. I hereby agree to notify the Company in writing within
         30 days after the date of any disposition of my shares and I will make
         adequate provision for Federal, state or other tax withholding
         obligations, if any, which arise upon the disposition of the Common
         Stock.

<PAGE>   10

         The Company may, but will not be obligated to, withhold from my
         compensation the amount necessary to meet any applicable withholding
         obligation including any withholding necessary to make available to the
         Company any tax deductions or benefits attributable to sale or early
         disposition of Common Stock by me. If I dispose of such shares at any
         time after the expiration of the 2-year and 1-year holding periods, I
         understand that I will be treated for federal income tax purposes as
         having received income only at the time of such disposition, and that
         such income will be taxed as ordinary income only to the extent of an
         amount equal to the lesser of (1) the excess of the fair market value
         of the shares at the time of such disposition over the purchase price
         which I paid for the shares, or (2) 15% of the fair market value of the
         shares on the first day of the Offering Period. The remainder of the
         gain, if any, recognized on such disposition will be taxed as capital
         gain.

7.       I hereby agree to be bound by the terms of the Employee Stock Purchase
         Plan. The effectiveness of this Subscription Agreement is dependent
         upon my eligibility to participate in the Employee Stock Purchase Plan.

8.       In the event of my death, I hereby designate the following as my
         beneficiary(ies) to receive all payments and shares due me under the
         Employee Stock Purchase Plan:

         BENEFICIARY NAME: (Please print) _____________________________________
                                          First            Middle          Last

         _________________________        _____________________________________
         Relationship
                                          _____________________________________
                                          Address

         Employee's Social
         Security Number:               _______________________________________

         Employee's Address:            _______________________________________

                                        _______________________________________

I UNDERSTAND THAT THIS SUBSCRIPTION AGREEMENT SHALL REMAIN IN EFFECT THROUGHOUT
SUCCESSIVE OFFERING PERIODS UNLESS TERMINATED BY ME.

         Dated:__________________       _______________________________________
                                                     Signature of Employee

                                        ________________________________________
                                                      Spouse's Signature
                                             (If beneficiary other than spouse)

                                      -2-

<PAGE>   11

                                    EXHIBIT B

                            KABIRA TECHNOLOGIES, INC.

                        2000 EMPLOYEE STOCK PURCHASE PLAN

                              NOTICE OF WITHDRAWAL

         The undersigned participant in the Offering Period of the Kabira
Technologies, Inc. Employee Stock Purchase Plan that began on ____________,
20___ (the "Enrollment Date") hereby notifies the Company that he or she hereby
withdraws from the Offering Period. He or she hereby directs the Company to pay
to the undersigned as promptly as practicable all the payroll deductions
credited to his or her account with respect to such Offering Period. The
undersigned understands and agrees that his or her option for such Offering
Period will be automatically terminated. The undersigned understands further
that no further payroll deductions will be made for the purchase of shares in
the current Offering Period and the undersigned shall be eligible to participate
in succeeding Offering Periods only by delivering to the Company a new
Subscription Agreement.

                                          Name and Address of Participant:

                                          _____________________________________

                                          _____________________________________

                                          _____________________________________

                                          Signature:

                                          _____________________________________

                                          Date:________________________________

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