Document:

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                                                                     EXHIBIT 4.3

THIS WARRANT AND THE SHARES ISSUABLE HEREUNDER HAVE NOT BEEN REGISTERED UNDER
THE SECURITIES ACT OF 1933, AS AMENDED, AND MAY NOT BE SOLD, PLEDGED, OR
OTHERWISE TRANSFERRED WITHOUT AN EFFECTIVE REGISTRATION THEREOF UNDER SUCH ACT
OR PURSUANT TO RULE 144 OR AN OPINION OF COUNSEL REASONABLY SATISFACTORY TO THE
CORPORATION AND ITS COUNSEL, THAT SUCH REGISTRATION IS NOT REQUIRED.

                           WARRANT TO PURCHASE STOCK

Corporation: Crossworlds Software, Inc., a Delaware corporation
Number of Shares: 6,334
Class of Stock: Common Stock
Initial Exercise Price: $6.60 per share
Issue Date: August 9, 1999
Expiration Date: August 9, 2004

     THIS WARRANT CERTIFIES THAT, for the agreed upon value of $1.00 and for
other good and valuable consideration, SILICON VALLEY BANK ("Holder") is
entitled to purchase the number of fully paid and nonassessable shares of the
class of securities (the "Shares") of the corporation (the "Company") at the
initial exercise price per Share (the "Warrant Price") all as set forth above
and as adjusted pursuant to Article 2 of this Warrant, subject to the provisions
and upon the terms and conditions set forth in this Warrant.

ARTICLE 1. EXERCISE.
           --------

          1.1  Method of Exercise.  Holder may exercise this Warrant by
               ------------------
delivering a duly executed Notice of Exercise in substantially the form attached
as Appendix 1 to the principal office of the Company.  Unless Holder is
exercising the conversion right set forth in Section 1.2, Holder shall also
deliver to the Company a check for the aggregate Warrant Price for the Shares
being purchased.

          1.2  Conversion Right.  In lieu of exercising this Warrant as
               ----------------
specified in Section 1.1, Holder may from time to time convert this Warrant, in
whole or in part, into a number of Shares determined by dividing (a) the
aggregate fair market value of the Shares or other securities otherwise issuable
upon exercise of this Warrant minus the aggregate Warrant Price of such Shares
by (b) the fair market value of one Share.  The fair market value of the Shares
shall be determined pursuant to Section 1.4.

          1.3  Intentionally Omitted
               ---------------------

          1.4  Fair Market Value.  If the Shares are traded in a public market,
               -----------------
the fair market value of the Shares shall be the five day average closing price
of the Shares (or the five day average closing price of the Company's stock into
which the Shares are convertible).  If the exercise is in connection with an
initial public offering of the Company's Common Stock, and if the Company's
registration statement relating to such public offering has been declared
effective by the SEC, then the fair market value shall be the initial "Price to
the Public" specified in the final prospectus with respect to the offering.  If
the Shares are not traded in a public market, the Board of Directors of the
Company shall determine fair market value in its reasonable good faith judgment.
The foregoing notwithstanding, if Holder advises the Board of Directors in
writing that Holder disagrees with such determination, then the Company and
Holder shall promptly agree upon a reputable investment banking firm to
undertake such valuation.  If the valuation of such investment banking firm is
greater than that determined by the Board of Directors, then all fees and
expenses of such investment banking firm shall be paid by the Company.  In all
other circumstances, such fees and expenses shall be paid by Holder.

          1.5  Delivery of Certificate and New Warrant.  Promptly after Holder
               ---------------------------------------
exercises or converts this Warrant, the Company shall deliver to Holder
certificates for the Shares acquired and, if this Warrant has not been fully
exercised or converted and has not expired, a new Warrant representing the
Shares not so acquired.
<PAGE>

          1.6  Replacement of Warrants.  On receipt of evidence reasonably
               -----------------------
satisfactory to the Company of the loss, theft, destruction or mutilation of
this Warrant and, in the case of loss, theft or destruction, on delivery of an
indemnity agreement reasonably satisfactory in form and amount to the Company
or, in the case of mutilation, on surrender and cancellation of this Warrant,
the Company at its expense shall execute and deliver, in lieu of this Warrant, a
new warrant of like tenor.

          1.7  Repurchase on Sale, Merger, or Consolidation of the Company.
               -----------------------------------------------------------

               1.7.1. "Acquisition".  For the purpose of this Warrant,
                       -----------
"Acquisition" means any sale, license, or other disposition of all or
substantially all of the assets of the Company, or any reorganization,
consolidation, or merger of the Company where the holders of the Company's
securities before the transaction beneficially own less than 50% of the
outstanding voting securities of the surviving entity after the transaction.

               1.7.2. Deemed Exercise or Assumption of Warrant.  If, on the
                      ----------------------------------------
closing date for any Acquisition, the fair market value of the Shares (or other
securities issuable upon exercise of this Warrant) is equal to or greater than
three (3) times the Initial Exercise Price, then the Warrant shall be deemed to
have been automatically exercised upon the closing date of such an Acquisition
and thereafter the Holder shall participate in the Acquisition as a holder of
the Shares (or other securities issuable upon exercise of the Warrant) on the
same terms as other holders of the same class of securities of the Company.  If,
on the closing date for any Acquisition, the fair market value of the Shares (or
other securities issuable upon exercise of this Warrant) is less than the three
(3) times the Initial Exercise Price, then upon the Acquisition, the successor
entity shall assume the obligations of the Warrant, and the Warrant shall be
exercisable for the same securities, cash, and property as would be payable for
the Shares issuable upon exercise of the unexercised portion of this Warrant as
if such Shares were outstanding on the record date for the Acquisition and
subsequent closing.

ARTICLE 2. ADJUSTMENTS TO THE SHARES.
           -------------------------

          2.1  Stock Dividends, Splits, Etc.   If the Company declares or pays a
               ----------------------------
dividend on its common stock (or the Shares if the Shares are securities other
than common stock) payable in common stock, or other securities, subdivides the
outstanding common stock into a greater amount of common stock, or, if the
Shares are securities other than common stock, subdivides the Shares in a
transaction that increases the amount of common stock into which the Shares are
convertible, then upon exercise of this Warrant, for each Share acquired, Holder
shall receive, without cost to Holder, the total number and kind of securities
to which Holder would have been entitled had Holder owned the Shares of record
as of the date the dividend or subdivision occurred.

          2.2  Reclassification, Exchange or Substitution.  Upon any
               ------------------------------------------
reclassification, exchange, substitution, or other event that results in a
change of the number and/or class of the securities issuable upon exercise or
conversion of this Warrant, Holder shall be entitled to receive, upon exercise
or conversion of this Warrant, the number and kind of securities and property
that Holder would have received for the Shares if this Warrant had been
exercised immediately before such reclassification, exchange, substitution, or
other event. Such an event shall include any automatic conversion of the
outstanding or issuable securities of the Company of the same class or series as
the Shares to common stock pursuant to the terms of the Company's Certificate of
Incorporation upon the closing of a registered public offering of the Company's
common stock. The Company or its successor shall promptly issue to Holder a new
Warrant for such new securities or other property. The new Warrant shall provide
for adjustments which shall be as nearly equivalent as may be practicable to the
adjustments provided for in this Article 2 including, without limitation,
adjustments to the Warrant Price and to the number of securities or property
issuable upon exercise of the new Warrant. The provisions of this Section 2.2
shall similarly apply to successive reclassifications, exchanges, substitutions,
or other events.

          2.3  Adjustments for Combinations, Etc.  If the outstanding shares are
               ---------------------------------
combined or consolidated, by reclassification or otherwise, into a lesser number
of shares, the Warrant Price shall be proportionately increased.

                                       2
<PAGE>

          2.4  No Impairment.  The Company shall not, by amendment of its
               -------------
Articles of Incorporation or through a reorganization, transfer of assets,
consolidation, merger, dissolution, issue, or sale of securities or any other
voluntary action, avoid or seek to avoid the observance or performance of any of
the terms to be observed or performed under this Warrant by the Company, but
shall at all times in good faith assist in carrying out of all the provisions of
this Article 2 and in taking all such action as may be necessary or appropriate
to protect Holder's rights under this Article against impairment. If the Company
takes any action affecting the Shares or its common stock other than as
described above that adversely affects Holder's rights under this Warrant, the
Warrant Price shall be adjusted downward and the number of Shares issuable upon
exercise of this Warrant shall be adjusted upward in such a manner that the
aggregate Warrant Price of this Warrant is unchanged.

          2.5  Fractional Shares.  No fractional Shares shall be issuable upon
               -----------------
exercise or conversion of the Warrant and the number of Shares to be issued
shall be rounded down to the nearest whole Share.  If a fractional share
interest arises upon any exercise or conversion of the Warrant, the Company
shall eliminate such fractional share interest by paying Holder an amount
computed by multiplying the fractional interest by the fair market value of a
full Share.

          2.6  Certificate as to Adjustments.  Upon each adjustment of the
               -----------------------------
Warrant Price, the Company at its expense shall promptly compute such
adjustment, and furnish Holder with a certificate of its Chief Financial Officer
setting forth such adjustment and the facts upon which such adjustment is based.
The Company shall, upon written request, furnish Holder a certificate setting
forth the Warrant Price in effect upon the date thereof and the series of
adjustments leading to such Warrant Price.

ARTICLE 3. REPRESENTATIONS AND COVENANTS OF THE COMPANY.
           --------------------------------------------

          3.1  Representations and Warranties.  The Company hereby represents
               ------------------------------
and warrants to the Holder as follows:

               (a)  The initial Warrant Price referenced on the first page of
this Warrant is not greater than as determined in good faith by the Board of
Directors of the Company.

               (b)  All Shares which may be issued upon the exercise of the
purchase right represented by this Warrant, and all securities, if any, issuable
upon conversion of the Shares, shall, upon issuance, be duly authorized, validly
issued, fully paid and nonassessable, and free of any liens and encumbrances
except for restrictions on transfer provided for herein or under applicable
federal and state securities laws.

               (c)  The Capitalization Table attached to this Warrant is true
and complete as of the Issue Date.

          3.2  Notice of Certain Events.  If the Company proposes at any time
               ------------------------
(a) to declare any dividend or distribution upon its common stock, whether in
cash, property, stock, or other securities and whether or not a regular cash
dividend; (b) to offer for subscription pro rata to the holders of shares of
Common Stock; (c) to effect any reclassification or recapitalization of common
stock; or (d) to merge or consolidate with or into any other corporation, or
sell, lease, license, or convey all or substantially all of its assets, or to
liquidate, dissolve or wind up, then, in connection with each such event, the
Company shall give Holder (1) at least 10 business days prior written notice of
the date on which a record will be taken for such dividend, distribution, or
subscription rights (and specifying the date on which the holders of common
stock will be entitled thereto) or for determining rights to vote, if any, in
respect of the matters referred to in (c) and (d) above; and (2) in the case of
the matters referred to in (c) and (d) above at least 10 days prior written
notice of the date when the same will take place (and specifying the date on
which the holders of common stock will be entitled to exchange their common
stock for securities or other property deliverable upon the occurrence of such
event).

          3.3  Information Rights.  So long as the Holder holds this Warrant
               ------------------
and/or any of the Shares, the Company shall deliver to the Holder (a) promptly
after mailing, copies of all notices or other written communications to the
shareholders of the Company, (b) within ninety (90) days after the end of

                                       3
<PAGE>

each fiscal year of the Company, the annual audited financial statements of the
Company certified by independent public accountants of recognized standing and
(c) such other financial statements required under and in accordance with any
loan documents between Holder and the Company (or if there are no such
requirements [or if the subject loan(s) no longer are outstanding]), then within
forty-five (45) days after the end of each of the first three quarters of each
fiscal year, the Company's quarterly, unaudited financial statements.

     ARTICLE 4. REPRESENTATIONS, WARRANTIES OF THE HOLDER.
                -----------------------------------------

     The Holder hereby represents and warrants to the Company as follows:

          4.1  Purchase for Own Account.  This Warrant and the securities to be
               ------------------------
acquired upon exercise of this Warrant by the Holder hereunder will be  acquired
for investment for the Holder's own account, not as a nominee or agent, and not
with a view to the public resale or distribution thereof within the meaning of
the 1933 Act, and the Holder has no present intention of selling, granting any
participation in, or otherwise distributing the same.  If not an individual, the
Holder also represents that the Holder has not been formed for the specific
purpose of acquiring this Warrant or the Shares.

          4.2  Disclosure of Information.  The Holder has received or has had
               -------------------------
full access to all the information it considers necessary or appropriate to make
an informed investment decision with respect to the acquisition of this Warrant
and its underlying securities.  The Holder further has had an opportunity to ask
questions and receive answers from the Company regarding the terms and
conditions of the offering of this Warrant and its underlying securities and to
obtain additional information (to the extent the Company possessed such
information or could acquire it without unreasonable effort or expense)
necessary to verify any information furnished to the Holder or to which the
Holder has access.

          4.3  Investment Experience.  The Holder understands that the purchase
               ---------------------
of this Warrant and its underlying securities involves substantial risk.  The
Holder:  (i) has experience as an investor in securities of companies in the
development stage and acknowledges that the Holder is able to fend for itself,
can bear the economic risk of such Holder's investment in this Warrant and its
underlying securities and has such knowledge and experience in financial or
business matters that the Holder is capable of evaluating the merits and risks
of its investment in this Warrant and its underlying securities and/or (ii) has
a preexisting personal or business relationship with the Company and certain of
its officers, directors or controlling persons of a nature and duration that
enables the Holder to be aware of the character, business acumen and financial
circumstances of such persons.

          4.4  No Public Market.  The Holder understands that no public market
               ----------------
currently exists for any Company securities, and that the Company has made no
statement that a public market will ever exist for Company securities.

          4.5  Accredited Investor Status.  The Holder is an "accredited
               --------------------------
investor" within the meaning of Regulation D promulgated under the 1933 Act.

          4.6  Lockup Period.  (a) The undersigned hereby agrees that, during
               -------------
the period of duration specified by the Company and an underwriter of common
stock or other securities of the Company, following the effective date of a
registration statement of the Company filed under the Securities Act of 1933, as
amended, it shall not, to the extent requested by the Company and such
underwriter, directly or indirectly sell, offer to sell, contract to sell
(including, without limitation, any short sale), grant any option to purchase or
otherwise transfer or dispose of (other than to donees who agree to be similarly
bound) any securities of the Company held by it as of the effective date except
common stock included in such registration; provided, however, that:

               (i)  all officers and directors of the Company enter into similar
agreements; and

               (ii) such market stand-off time period shall not exceed one
hundred eighty (180) days without the consent of the undersigned.

                                       4
<PAGE>

               (b)  The undersigned agrees to provide to the other underwriters
of any public offering such further agreement as such underwriter may require in
connection with this market stand-off agreement. In order to enforce the
foregoing covenant, the Company may impose stop-transfer instructions with
respect to the Shares (and the shares or securities of every other person
subject to the foregoing restriction) until the end of such period.

ARTICLE 5. MISCELLANEOUS.
           -------------

          5.1  Term.  This Warrant is exercisable, in whole or in part, at any
               ----
time and from time to time on or before the Expiration Date set forth above.
The Company shall give Holder written notice of any Acquisition (as defined in
Section 1.7, above) at least 10 business days before the consummation of such
Acquisition.  If such notice is not received by Holder, and to the extent this
Warrant must be exercised pursuant to Section 1.7.2, above, the Expiration Date
shall automatically be extended until 10 business days after the date Holder
receives such notice.

          5.2  Legends.  This Warrant and the Shares (and the securities
               -------
issuable, directly or indirectly, upon conversion of the Shares, if any) shall
be imprinted with one or all of the following legends in substantially the
following form:

     (a) THIS SECURITY HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933,
     AS AMENDED, AND MAY NOT BE SOLD, PLEDGED OR OTHERWISE TRANSFERRED WITHOUT
     AN EFFECTIVE REGISTRATION THEREOF UNDER SUCH ACT OR PURSUANT TO RULE 144 OR
     AN OPINION OF COUNSEL REASONABLY SATISFACTORY TO THE CORPORATION AND ITS
     COUNSEL THAT SUCH REGISTRATION IS NOT REQUIRED.

     (b)  ANY LEGEND REQUIRED BY THE BLUE SKY LAWS OF ANY STATE TO THE EXTENT
     SUCH LAWS ARE APPLICABLE TO THE SHARES REPRESENTED BY THE CERTIFICATE SO
     LEGENDED.

          5.3  Compliance with Securities Laws on Transfer.  This Warrant and
               -------------------------------------------
the Shares issuable upon exercise this Warrant (and the securities issuable,
directly or indirectly, upon conversion of the Shares, if any) may not be
transferred or assigned in whole or in part without compliance with applicable
federal and state securities laws by the transferor and the transferee
(including, without limitation, the delivery of investment representation
letters and, if required by the Company, legal opinions reasonably satisfactory
to the Company, as reasonably requested by the Company).  The Company shall not
require Holder to provide an opinion of counsel if the transfer is to an
affiliate of Holder or if there is no material question as to the availability
of current information as referenced in Rule 144(c), Holder represents that it
has complied with Rule 144(d) and (e) in reasonable detail, the selling broker
represents that it has complied with Rule 144(f), and the Company is provided
with a copy of Holder's timely filed notice of proposed sale.

          5.4  Transfer Procedure.  Subject to the provisions of Section 4.3
               ------------------
Holder may transfer all or part of this Warrant or the Shares issuable upon
exercise of this Warrant (or the securities issuable, directly or indirectly,
upon conversion of the Shares, if any) at any time to Silicon Valley Bancshares
or The Silicon Valley Bank Foundation, or to any affiliate of Holder, or, to any
other transferree by giving the Company prior written notice of the portion of
the Warrant being transferred setting forth the name, address and taxpayer
identification number of the transferee and surrendering this Warrant to the
Company for reissuance to the transferee(s) (and Holder if applicable) provided
that Holder transfers a portion of the Warrant for the greater of 2,500 Shares
or all of the Shares subject to the Warrant, and provided further that in no
event shall the number of transfers of the rights and interest in the Warrant
exceeds three (3) transfers.  Unless the Company is filing financial information
with the SEC pursuant to the Securities Exchange Act of 1934, the Company shall
have the right to refuse to transfer any portion of this Warrant to any person
who directly competes with the Company.

          5.5  No Rights as Shareholder.  Until the exercise of this Warrant,
               ------------------------
the Holder of this Warrant shall not have or exercise any rights by virtue
hereof as a stockholder of the Company.

                                       5
<PAGE>

          5.6  Notices.  All notices and other communications from the Company
               -------
to the Holder, or vice versa, shall be deemed delivered and effective when given
personally or mailed by first-class registered or certified mail at such address
as may have been furnished to the Company or the Holder, as the case may be, in
writing by the Company or such holder from time to time.   All notices to be
provided under this Warrant shall be sent to the following address:

               Silicon Valley Bank
               Attn: Treasury Department
               3003 Tasman Drive
               Santa Clara, CA  95054

          5.7  Waiver.  This Warrant and any term hereof may be changed, waived,
               ------
discharged or terminated only by an instrument in writing signed by the party
against which enforcement of such change, waiver, discharge or termination is
sought.

          5.8  Attorneys Fees.  In the event of any dispute between the parties
               --------------
concerning the terms and provisions of this Warrant, the party prevailing in
such dispute shall be entitled to collect from the other party all costs
incurred in such dispute, including reasonable attorneys' fees.

          5.9  Governing Law.  This Warrant shall be governed by and construed
               -------------
in accordance with the laws of the State of California, without giving effect to
its principles regarding conflicts of law.

                                    "COMPANY"

                                    CROSSWORLDS SOFTWARE, INC.

                                    By:  ________________________________

                                    Name:  ______________________________
                                           (Print)
                                    Title: Chairman of the Board, President or
                                           Vice President

                                    By:  ________________________________

                                    Name:  ______________________________
                                           (Print)
                                    Title: Chief Financial Officer, Secretary,
                                           Assistant Treasurer or Assistant
                                           Secretary

                                       6
<PAGE>

                                  APPENDIX 1

                              NOTICE OF EXERCISE
                              ------------------

     1.   The undersigned hereby elects to purchase _____________ shares of the
Common/Preferred Series ___ [Strike one] Stock of ______________. pursuant to
the terms of the attached Warrant, and tenders herewith payment of the purchase
price of such shares in full.

     1.   The undersigned hereby elects to convert the attached Warrant into
Shares/cash [strike one] in the manner specified in the Warrant.  This
conversion is exercised with respect to _____________________ of the Shares
covered by the Warrant.

     [Strike paragraph that does not apply.]

     2.   Please issue a certificate or certificates representing said shares in
the name of the undersigned or in such other name as is specified below:

               ___________________________________________
                    (Name)
               ___________________________________________

               ___________________________________________
                    (Address)

     3.   The undersigned represents it is acquiring the shares solely for its
own account and not as a nominee for any other party and not with a view toward
the resale or distribution thereof except in compliance with applicable
securities laws.

___________________________________          _____________________
     (Signature)                             Date<PAGE>
                                                                     Exhibit 4.5

THE SECURITIES REPRESENTED BY THIS CERTIFICATE HAVE NOT BEEN REGISTERED UNDER
THE SECURITIES ACT OF 1933, AND HAVE BEEN ACQUIRED FOR INVESTMENT AND NOT WITH A
VIEW TO, OR IN CONNECTION WITH, THE SALE OR DISTRIBUTION THEREOF. NO SUCH SALE
OR DISTRIBUTION MAY BE EFFECTED WITHOUT AN EFFECTIVE REGISTRATION STATEMENT
RELATED THERETO OR AN OPINION OF COUNSEL IN A FORM SATISFACTORY TO THE COMPANY
THAT SUCH REGISTRATION IS NOT REQUIRED UNDER THE SECURITIES ACT OF 1933.
--------------------------------------------------------------------------------

Warrant No.                                         Number of Shares:
Date of Issuance: February 2, 2000                  (subject to adjustment)

                           CROSSWORLDS SOFTWARE, INC.

                          Common Stock Purchase Warrant

         CrossWorlds Software, Inc. (the "Company"), for value received, hereby
certifies that ________________________________________________________, or its
registered assigns (the "Registered Holder"), is entitled, subject to the terms
set forth below, to purchase from the Company, at any time after the date hereof
and on or before the Expiration Date (as defined in Section 5 below), up to
_____________________ shares (as adjusted from time to time pursuant to the
provisions of this Warrant) of Common Stock of the Company, at a purchase price
of $11.00 per share. The shares purchasable upon exercise of this Warrant and
the purchase price per share, as adjusted from time to time pursuant to the
provisions of this Warrant, are hereinafter referred to as the "Warrant Stock"
and the "Purchase Price," respectively.

         1.       Exercise.

                  (a) Manner of Exercise. This Warrant may be exercised by the
Registered Holder, in whole or in part, by surrendering this Warrant, with the
purchase/exercise form appended hereto as Exhibit A duly executed by such
Registered Holder or by such Registered Holder's duly authorized attorney, at
the principal office of the Company, or at such other office or agency as the
Company may designate, accompanied by payment in full of the Purchase Price
payable in respect of the number of shares of Warrant Stock purchased upon such
exercise. The Purchase Price may be paid by cash, check, wire transfer or by the
surrender of promissory notes or other instruments representing indebtedness of
the Company to the Registered Holder.

                  (b) Effective Time of Exercise. Each exercise of this Warrant
shall be deemed to have been effected immediately prior to the close of business
on the day on which this Warrant shall have been surrendered to the Company as
provided in Section 1(a) above. At such time, the person or persons in whose
name or names any certificates for Warrant Stock shall be issuable upon such
exercise as provided in Section 1(d) below shall be deemed to have become the
holder or holders of record of the Warrant Stock represented by such
certificates.

                  (c) Net Issue Exercise.

<PAGE>

                  (i) In lieu of exercising this Warrant in the manner
provided above in Section 1(a), the Registered Holder may elect to receive
shares equal to the value of this Warrant (or the portion thereof being
canceled) by surrender of this Warrant at the principal office of the Company
together with notice of such election on the purchase/exercise form appended
hereto as Exhibit A duly executed by such Registered Holder or such Registered
Holder's duly authorized attorney, in which event the Company shall issue to
holder a number of shares of Common Stock computed using the following formula:

                                    X =     Y (A - B)
                                            --------
                                               A

Where     X = The number of shares of Common Stock to be issued to the
              Registered Holder.

          Y = The number of shares of Common Stock purchasable under this
              Warrant (at the date of such calculation).

          A = The fair market value of one share of Common Stock (at the date
              of such calculation).

          B = The Purchase Price (as adjusted to the date of such calculation).

                  (ii) For purposes of this Section 1(c), the fair market
value of one share of Common Stock on the date of calculation shall mean:

                (A) if the exercise is in connection with an initial public
offering of the Company's Common Stock, and if the Company's Registration
Statement relating to such public offering has been declared effective by the
Securities and Exchange Commission, then the fair market value per share of
Common Stock shall be the initial "Price to Public" specified in the final
prospectus with respect to the offering;

                (B) if this Warrant is exercised after, and not in connection
with, the Company's initial public offering, and if the Company's Common Stock
is traded on a securities exchange or The Nasdaq Stock Market or actively traded
over-the-counter:

                (1) if the Company's Common Stock is traded on a securities
exchange or The Nasdaq Stock Market, the fair market value shall be deemed to be
the average of the closing prices over a thirty (30) day period ending three
days before date of calculation; or

                (2) if the Company's Common Stock is actively traded over-the-
counter, the fair market value shall be deemed to be the average of the closing
bid or sales price (whichever is applicable) over the thirty (30) day period
ending three days before the date of calculation; or

                (C) if neither (A) nor (B) is applicable, the fair market value
shall be at the highest price per share which the Company could obtain on the
date of calculation

                                      -2-

<PAGE>

from a willing buyer (not a current employee or director) for shares of Common
Stock sold by the Company, from authorized but unissued shares, as agreed by the
Company and the Registered Holder, unless the Company is at such time subject to
an acquisition as described in Section 5(b) below, in which case the fair market
value per share of Common Stock shall be deemed to be the value of the
consideration per share received by the holders of such stock pursuant to such
acquisition.

                (d) Delivery to Holder. As soon as practicable after the
exercise of this Warrant in whole or in part, and in any event within ten (10)
days thereafter, the Company at its expense will cause to be issued in the name
of, and delivered to, the Registered Holder, or as such Holder (upon payment by
such Holder of any applicable transfer taxes) may direct:

                (i) a certificate or certificates for the number of shares of
Warrant Stock to which such Registered Holder shall be entitled, and

                (ii) in case such exercise is in part only, a new warrant or
warrants (dated the date hereof) of like tenor, calling in the aggregate on the
face or faces thereof for the number of shares of Warrant Stock equal (without
giving effect to any adjustment therein) to the number of such shares called for
on the face of this Warrant minus the number of such shares purchased by the
Registered Holder upon such exercise as provided in Section 1(a) above.

        2. Adjustments.

                (a) Stock Splits and Dividends. If outstanding shares of the
Company's Common Stock shall be subdivided into a greater number of shares or a
dividend in Common Stock shall be paid in respect of Common Stock, the Purchase
Price in effect immediately prior to such subdivision or at the record date of
such dividend shall simultaneously with the effectiveness of such subdivision or
immediately after the record date of such dividend be proportionately reduced.
If outstanding shares of Common Stock shall be combined into a smaller number of
shares, the Purchase Price in effect immediately prior to such combination
shall, simultaneously with the effectiveness of such combination, be
proportionately increased. When any adjustment is required to be made in the
Purchase Price, the number of shares of Warrant Stock purchasable upon the
exercise of this Warrant shall be changed to the number determined by dividing
(i) an amount equal to the number of shares issuable upon the exercise of this
Warrant immediately prior to such adjustment, multiplied by the Purchase Price
in effect immediately prior to such adjustment, by (ii) the Purchase Price in
effect immediately after such adjustment.

                (b) Reclassification, Etc. In case of any reclassification or
change of the outstanding securities of the Company or of any reorganization of
the Company (or any other corporation the stock or securities of which are at
the time receivable upon the exercise of this Warrant) or any similar corporate
reorganization on or after the date hereof, then and in each such case the
holder of this Warrant, upon the exercise hereof at any time after the
consummation of such reclassification, change, reorganization, merger or
conveyance, shall be entitled to receive, in lieu of the stock or other
securities and property receivable upon the exercise hereof prior to such
consummation, the stock or other securities or property to which such holder
would

                                      -3-

<PAGE>

have been entitled upon such consummation if such holder had exercised
this Warrant immediately prior thereto, all subject to further adjustment as
provided in Section 2(a); and in each such case, the terms of this Section 2
shall be applicable to the shares of stock or other securities properly
receivable upon the exercise of this Warrant after such consummation.

                (c) Adjustment Certificate. When any adjustment is required to
be made in the Warrant Stock or the Purchase Price pursuant to this Section 2,
the Company shall promptly mail to the Registered Holder a certificate setting
forth (i) a brief statement of the facts requiring such adjustment, (ii) the
Purchase Price after such adjustment and (iii) the kind and amount of stock or
other securities or property into which this Warrant shall be exercisable after
such adjustment.

        3. Transfers.

                (a) Unregistered Security. Each holder of this Warrant
acknowledges that this Warrant and the Warrant Stock have not been registered
under the Securities Act of 1933, as amended (the "Securities Act"), and agrees
not to sell, pledge, distribute, offer for sale, transfer or otherwise dispose
of this Warrant or any Warrant Stock issued upon its exercise in the absence of
(i) an effective registration statement under the Act as to this Warrant or such
Warrant Stock and registration or qualification of this Warrant or such Warrant
Stock under any applicable U.S. federal or state securities law then in effect
or (ii) an opinion of counsel, satisfactory to the Company, that such
registration and qualification are not required. Each certificate or other
instrument for Warrant Stock issued upon the exercise of this Warrant shall bear
a legend substantially to the foregoing effect.

                (b) Transferability. Subject to the provisions of Section 3(a)
hereof and of Section 1.11 of the Investors' Rights Agreement dated October 1,
1999 among the Company and certain holders of the Company's securities, this
Warrant and all rights hereunder are transferable, in whole or in part, upon
surrender of the Warrant with a properly executed assignment (in the form of
Exhibit B hereto) at the principal office of the Company.

                (c) Warrant Register. The Company will maintain a register
containing the names and addresses of the Registered Holders of this Warrant.
Until any transfer of this Warrant is made in the warrant register, the Company
may treat the Registered Holder of this Warrant as the absolute owner hereof for
all purposes; provided, however, that if this Warrant is properly assigned in
blank, the Company may (but shall not be required to) treat the bearer hereof as
the absolute owner hereof for all purposes, notwithstanding any notice to the
contrary. Any Registered Holder may change such Registered Holder's address as
shown on the warrant register by written notice to the Company requesting such
change.

        4. No Impairment. The Company will not, by amendment of its charter or
through reorganization, consolidation, merger, dissolution, sale of assets or
any other voluntary action, avoid or seek to avoid the observance or performance
of any of the terms of this Warrant, but will at all times in good faith assist
in the carrying out of all such terms and in the taking of all such action as
may be necessary or appropriate in order to protect the rights of the holder of
this Warrant against impairment.

                                      -4-

<PAGE>

        5. Termination. This Warrant (and the right to purchase securities upon
exercise hereof) shall terminate upon the earliest to occur of the following
(the "Expiration Date"): (a) February 2, 2005, (b) the sale, conveyance or
disposal of all or substantially all of the Company's property or business or
the Company's merger into or consolidation with any other corporation (other
than a wholly-owned subsidiary of the Company) or any other transaction or
series of related transactions in which more than fifty percent (50%) of the
voting power of the Company is disposed of, provided that this Section 5(b)
shall not apply to a merger effected exclusively for the purpose of changing the
domicile of the Company, or (c) five (5) years after the closing of the initial
public offering of the Company's Common Stock pursuant to a registration
statement under the Securities Act.

        6. Notices of Certain Transactions. In case:

                (a) the Company shall take a record of the holders of its
Common Stock (or other stock or securities at the time deliverable upon the
exercise of this Warrant) for the purpose of entitling or enabling them to
receive any dividend or other distribution, or to receive any right to subscribe
for or purchase any shares of stock of any class or any other securities, or to
receive any other right, to subscribe for or purchase any shares of stock of any
class or any other securities, or to receive any other right, or

                (b) of any capital reorganization of the Company, any
reclassification of the capital stock of the Company, any consolidation or
merger of the Company, any consolidation or merger of the Company with or into
another corporation (other than a consolidation or merger in which the Company
is the surviving entity), or any transfer of all or substantially all of the
assets of the Company, or

                (c) of the voluntary or involuntary dissolution, liquidation or
winding-up of the Company,

then, and in each such case, the Company will mail or cause to be mailed to the
Registered Holder of this Warrant a notice specifying, as the case may be, (i)
the date on which a record is to be taken for the purpose of such dividend,
distribution or right, and stating the amount and character of such dividend,
distribution or right, or (ii) the effective date on which such reorganization,
reclassification, consolidation, merger, transfer, dissolution, liquidation or
winding-up is to take place, and the time, if any is to be fixed, as of which
the holders of record of Common Stock (or such other stock or securities at the
time deliverable upon such reorganization, reclassification, consolidation,
merger, transfer, dissolution, liquidation or winding-up) are to be determined.
Such notice shall be mailed at least ten (10) days prior to the record date or
effective date for the event specified in such notice.

        7. Reservation of Stock. The Company will at all times reserve and keep
available, solely for the issuance and delivery upon the exercise of this
Warrant, such shares of Warrant Stock and other stock, securities and property,
as from time to time shall be issuable upon the exercise of this Warrant.

                                      -5-

<PAGE>

        8. Exchange of Warrants. Upon the surrender by the Registered Holder of
any Warrant or Warrants, properly endorsed, to the Company at the principal
office of the Company, the Company will, subject to the provisions of Section 3
hereof, issue and deliver to or upon the order of such Holder, at the Company's
expense, a new Warrant or Warrants of like tenor, in the name of such Registered
Holder or as such Registered Holder (upon payment by such Registered Holder of
any applicable transfer taxes) may direct, calling in the aggregate on the face
or faces thereof for the number of shares of Common Stock called for on the face
or faces of the Warrant or Warrants so surrendered.

        9. Replacement of Warrants. Upon receipt of evidence reasonably
satisfactory to the Company of the loss, theft, destruction or mutilation of
this Warrant and (in the case of loss, theft or destruction) upon delivery of an
indemnity agreement (with surety if reasonably required) in an amount reasonably
satisfactory to the Company, or (in the case of mutilation) upon surrender and
cancellation of this Warrant, the Company will issue, in lieu thereof, a new
Warrant of like tenor.

        10. Notices. Any notice required or permitted by this Warrant shall be
in writing and shall be deemed sufficient upon receipt, when delivered
personally or by courier, overnight delivery service or confirmed facsimile, or
forty-eight (48) hours after being deposited in the regular mail as certified or
registered mail (airmail if sent internationally) with postage prepaid,
addressed (a) if to the Registered Holder, to the address of the Registered
Holder most recently furnished in writing to the Company and (b) if to the
Company, to the address set forth below or subsequently modified by written
notice to the Registered Holder.

        11. No Rights as Stockholder. Until the exercise of this Warrant, the
Registered Holder of this Warrant shall not have or exercise any rights by
virtue hereof as a stockholder of the Company.

        12. No Fractional Shares. No fractional shares of Common Stock will be
issued in connection with any exercise hereunder. In lieu of any fractional
shares which would otherwise be issuable, the Company shall pay cash equal to
the product of such fraction multiplied by the fair market value of one share of
Common Stock on the date of exercise, as determined in good faith by the
Company's Board of Directors.

        13. Amendment or Waiver. Any term of this Warrant may be amended or
waived only by an instrument in writing signed by the party against which
enforcement of the amendment or waiver is sought.

        14. Headings. The headings in this Warrant are for purposes of
reference only and shall not limit or otherwise affect the meaning of any
provision of this Warrant.

        15. Governing Law. This Warrant shall be governed, construed and
interpreted in accordance with the laws of the State of California, without
giving effect to principles of conflicts of law.

                                      -6-

<PAGE>

                                           CROSSWORLDS SOFTWARE, INC.

                                           By: _________________________________
                                           Mark R. Kent, Chief Financial Officer

                                           Address: 577 Airport Blvd., Suite 800
                                                    Burlingame, CA 94010

AGREED AND ACCEPTED:

WARRANT HOLDER

Name (print): __________________________________

Signature: _____________________________________

Title (if applicable): ______________________________

Address:

                                      -7-

<PAGE>

                                    EXHIBIT A

                             PURCHASE/EXERCISE FORM

To: CrossWorlds Software, Inc.                                Dated:

    The undersigned, pursuant to the provisions set forth in the attached
Warrant No. _____, hereby irrevocably elects to (a) purchase _______ shares of
the Common Stock covered by such Warrant and herewith makes payment of
$_________, representing the full purchase price for such shares at the price
per share provided for in such Warrant, or (b) exercise such Warrant for _______
shares purchasable under the Warrant pursuant to the Net Issue Exercise
provisions of Section 1(c) of such Warrant.

    The undersigned further acknowledges that it has reviewed the market
standoff provisions set forth in Section 1.11 of the Investors' Rights Agreement
dated October 1, 1999 among the Company and certain holders of the Company's
securities and agrees to be bound by such provisions.

                                        Signature: _____________________________

                                        Name (print): __________________________

                                        Title (if applic.) _____________________

                                        Company (if applic.): __________________

<PAGE>

                                    EXHIBIT B

                                 ASSIGNMENT FORM

        FOR VALUE RECEIVED, _________________________________________ hereby
sells, assigns and transfers all of the rights of the undersigned under the
attached Warrant with respect to the number of shares of Common Stock covered
thereby set forth below, unto:

Name of Assignee                  Address/Fax Number              No. of Shares

Dated:_________________               Signature: _______________________________

                                                 _______________________________

                                      Witness:   _______________________________

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