Document:

<PAGE>

                                                                   EXHIBIT 10.25

*    Represents confidential information for which Ariba, Inc. is seeking
     confidential treatment with the Securities and Exchange Commission.

                                December 10, 2001

Nihon Ariba K.K.
Tokyo Opera City Tower, 36th Floor
3-20-2, Nishi-Shinjuku
Shinjuku-ku
Tokyo 163-1436 Japan

Ariba, Inc.
807 11th Avenue,
Sunnyvale, CA 94089,
United States

Re:  Revenue Targets

Gentlemen:

     This Standby Purchase Agreement (this "Standby Purchase Agreement") sets
forth certain undertakings of SOFTBANK EC Holding Corp. ("SBEC") as to certain
Revenue Commitments described herein with respect to certain Software products
and services of Nihon Ariba K.K. (the "Company"). Certain capitalized terms used
herein shall have the respective meanings set forth for such terms in Exhibit A
attached hereto; others that are not otherwise defined herein shall have the
meaning given to them in the Amended Master Alliance Agreement (as defined in
Exhibit A).

     1. Revenue Targets.

          (a) Subject to Section 1(b), the Revenue Targets for each Revenue
     Period are as follows:

       ------------------------ ------------------------- ----------------------
              Revenue Period         Revenue Target           Revenue Date
       ------------------------ ------------------------- ----------------------
                    1.                    [*]                      [*]
       ------------------------ ------------------------- ----------------------
                    2.                    [*]                      [*]
       ------------------------ ------------------------- ----------------------
                    3.                    [*]                      [*]
       ------------------------ ------------------------- ----------------------
                    4.                    [*]                      [*]
       ------------------------ ------------------------- ----------------------
                    5.                    [*]                      [*]
       ------------------------ ------------------------- ----------------------
                    6.                    [*]                      [*]
       ------------------------ ------------------------- ----------------------

<PAGE>

       ------------------------ ------------------------- ----------------------
              Revenue Period         Revenue Target           Revenue Date
       ------------------------ ------------------------- ----------------------
                     7.                   [*]                      [*]
       ------------------------ ------------------------- ----------------------
                     8.                   [*]                      [*]
       ------------------------ ------------------------- ----------------------
                     9.                   [*]                      [*]
       ------------------------ ------------------------- ----------------------
                     10.                  [*]                      [*]
       ------------------------ ------------------------- ----------------------
       Total                              [*]
       ------------------------ ------------------------- ----------------------

          (b) Notwithstanding the foregoing, the Revenue Target(s) applicable to
     (i) the Revenue Period during which any of the following events or
     circumstances occurs and (ii) any succeeding Revenue Period(s) shall be
     reduced to zero, and SBEC shall have no [*] Payment obligations or other
     liabilities hereunder with respect to such Revenue Targets:

               (i) if either Ariba, Inc. ("Ariba") or the Company (except, in
          the case of the Company, while a [*] (as defined in the First Amended
          and Restated Shareholders Agreement by and among Softbank Corp., SBEC,
          Ariba and the Company ("Shareholders Agreement")) is in effect) has
          elected to terminate the [*] between them dated December 10, 2001 in
          accordance with the terms thereof (the "[*]"), or

               (ii) if the Company is dissolved, liquidated, or declared
          bankrupt or a filing for voluntary or involuntary bankruptcy, civil
          rehabilitation or for the application of other similar insolvency or
          rehabilitation procedures is made by the Company.

     2. Notice of Revenue. Within twenty (20) days after the end of each Revenue
Period, the Company will provide SBEC with a report, prepared in accordance with
the Company's records, the Purchase Orders and Payment Reports (each as defined
in the Amended Master Alliance Agreement), and summarizing in reasonable detail
the Qualifying Revenues received by the Company for such Revenue Period, with
appropriate documentation reasonably requested by SBEC to verify the calculation
of such Qualifying Revenues set out in the report (the "Qualifying Revenue
Report").

     3. [*] Payments.

          (a) If a [*] exists for a Revenue Period, then within ten (10) days
     after receiving the Qualifying Revenue Report for the applicable Revenue
     Period (such tenth day is described herein as the "[*] Date"), SBEC shall
     pay to the Company an irrevocable and nonrefundable amount equal to the [*]
     (the "[*] Payment"). SBEC shall receive a nonrefundable credit in the
     amount of each [*] Payment received by the Company (whether from SBEC
     pursuant hereto or from SOFTBANK Corp. pursuant to the Release,
     Reimbursement and Payment Agreement dated as of the date hereof among the
     parties hereto and SOFTBANK Corp. (the "Release")) as a credit to be
     applied to Qualifying Revenues paid to the Company for future Software
     product licenses (the "[*] Licenses") purchased prior to the final Revenue
     Date by Alliance Partner(s) pursuant to (i) the Amended Master Alliance
     Agreement; or (ii) an Approved Purchase Agreement. Section 3(c) hereof,
     together with the last sentence of this Section 3(a), shall govern the
     application of such credits. For purposes of calculating Qualifying
     Revenues for each Revenue Period, any Revenue arising from [*] Licenses
     shall be considered as arising in the Revenue Period in which the [*]
     resulting in such [*] Licenses occurred. For the avoidance of doubt, the
     parties acknowledge and agree that (i) SBEC shall not be entitled to a
     refund or to

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     receive cash payment in lieu of credit against future Software product
     license fees or support fees, or to apply credits to any payments other
     than as expressly set forth in Section 3(c); (ii) all [*] Payments provided
     for hereunder must be made even if no modification, enhancement or other
     changes are made to the existing Software products and product suites as
     offered by the Company; (iii) without limiting any other obligations of
     SBEC set forth herein or otherwise or of any Alliance Partner, any [*] that
     has not been paid to the Company by March 31, 2004 shall be paid within 30
     days thereafter; and (iv) all credits towards [*] Licenses shall expire if
     not used prior to March 31, 2004.

          (b) For purposes of calculating the Qualifying Revenues and the [*]
     (if any) for any Revenue Period, Qualifying Revenues in yen during such
     Revenue Period shall be converted into U.S. Dollars at the exchange rate
     determined as follows: the dollar/yen exchange rate to be used for such
     Revenue Period shall be set on the first business day of such Revenue
     Period and shall equal the average of the daily closing Japanese Yen Spot
     Prices as quoted by Bloomberg on each day during the twenty business days
     up to and including such first business day; provided that (i) if such
     average is lower than [*] (e.g., [*]), then the exchange rate for such
     Revenue Period shall be [*] and (ii) if such average is higher than [*]
     (e.g., [*]), then the exchange rate for such Revenue Period shall be [*].

          (c) If, in a Revenue Period, Company receives Qualifying Revenue
     pursuant to the Amended Master Alliance Agreement or an Approved Purchase
     Agreement in excess of the Revenue Target for such Revenue Period, then
     within forty-five (45) days of Company's receipt of payment in cash for the
     entire amount of Qualifying Revenue for such Revenue Period, Company shall
     pay to SBEC, by wire transfer, an amount equal to the lesser of (a) the
     amount by which the Qualifying Revenue for such Revenue Period exceeds the
     Revenue Target for such Revenue Period and (b) the amount of [*] existing
     at the beginning of such Revenue Period. Notwithstanding the foregoing, the
     Company shall not be required to make any cash payment due hereunder for
     any Revenue Period unless the Company receives cash payment of all
     Qualifying Revenues for such Revenue Period within 60 days after the end of
     such Revenue Period.

     4. Notice of Objection.

          (a) After any [*] Payment has been made in compliance with Section
     3(a) for any Revenue Period and within sixty (60) days from the Revenue
     Date for such Revenue Period (the "Objection Notice Period"), SBEC may give
     the Company written notice that SBEC objects to the calculation of
     Qualifying Revenues set forth in such Qualifying Revenue Report (the
     "Objection Notice"). Neither the filing of an Objection Notice nor any
     pending dispute shall relieve SBEC of its obligation to promptly make any
     [*] Payment in accordance with Section 3(a) above.

          (b) Upon receipt of any Objection Notice, the parties will use
     reasonable efforts to resolve any objections. If the parties are unable to
     resolve the dispute within twenty (20) days from the date of the Objection
     Notice, the parties will jointly select an accounting firm of international
     standing to resolve the dispute. If the parties are unable to agree on the
     choice of such an accounting firm, they will select an accounting firm of
     international standing by lot (other than any accounting firms for any of
     the parties) (the "Accountant") which

                                       3

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     shall determine the Qualifying Revenue for the applicable Revenue Period.
     The Accountant shall deliver to each of the parties its determination
     within twenty (20) days after being selected, and the determination of the
     Accountant shall be binding upon the parties. The expenses of the
     Accountant shall be borne equally by the parties, provided that if SBEC's
     objection is resolved in SBEC's favor, the Company shall reimburse SBEC to
     the extent required so that the amount paid by SBEC pursuant to Section
     3(a) hereof less the amount of such reimbursement is in accordance with the
     resolution of the dispute. SBEC acknowledges and agrees that any Revenue
     recognized by the Company prior to or in a Revenue Period that constitutes
     Excluded Cash Payments (as defined below) shall not count as Revenue for
     purposes of satisfying the Revenue Targets.

     5. Company Records. The Company shall maintain complete and accurate
accounting records in accordance with sound accounting principles and will
preserve such records for a period of at least two (2) years. SBEC may
semi-annually, or at such additional time at its request, audit, or hire an
independent auditor to audit, the operations, books and records of the Company
required to be maintained pursuant to this Section.

     6. Unconditional Obligation. SBEC's obligation to fully and promptly make
all [*] Payments is and shall remain unconditional and irrevocable
notwithstanding any breach or termination of this Standby Purchase Agreement,
the Amended Master Alliance Agreement or any related agreements or obligations
or the occurrence of a Modification Event (as defined in the Shareholders
Agreement) or Payment Failure (as defined in the [*] dated as of the date hereof
between Ariba, Inc. and the Company). SBEC expressly waives any defense to the
obligations set forth in either this Standby Purchase Agreement or the Amended
Master Alliance Agreement that it or any Alliance Partner may have now or
hereafter may have. Until all [*] Payments that are required to be paid pursuant
to Section 3(a) hereof have been made in full, SBEC and Alliance Partners
expressly waive any right to enforce any remedy which SBEC or Alliance Partners
now has or hereafter may have against Ariba in connection with the Transaction
Agreements, Approved Purchase Agreements, and any other agreements between
Softbank Corp. or its affiliates and Ariba or its affiliates relating to the
Company; provided that such enforcement rights shall be restored upon the
payment in full of any [*] Payments that are required to be paid pursuant to
Section 3(a) hereof. Any right to enforce any obligation under this Standby
Purchase Agreement or any other agreement shall not affect the waivers of SBEC
set forth in this Section 6. Alliance Partners and SBEC expressly waive all
setoffs and counterclaims and all presentments, demands for performance, notices
of nonperformance, protests, notices of protest, notices of dishonor, and all
other notices of any kind or nature whatsoever with respect to the Revenue
Commitments and [*] Payments. Alliance Partners and SBEC expressly waive, to the
fullest extent allowed by law, the benefit of any statute of limitations
affecting Alliance Partners' or SBEC's liability hereunder.

     7. Term; Effect of Termination.

          (a) This Standby Purchase Agreement shall become effective on the
     Attachment Effective Date and shall continue until the later of (A) March
     31, 2004 or (B) when SBEC shall have paid all [*] Payments required to be
     paid by it pursuant hereto.

          (b) The Revenue Commitment and the obligation to pay any unfulfilled
     [*] Payments (whether currently due or for future Revenue Periods) set
     forth in

                                       4

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     Section 3 above, and the Company's obligations under Section 3(c) above as
     limited by the last sentence of Section 3(c), shall survive any expiration
     or termination of this Standby Purchase Agreement or the Amended Master
     Alliance Agreement.

     8. Governing Law; Dispute Resolution. The validity, construction and
enforceability of this Standby Purchase Agreement and all related agreements,
collectively or separately, shall be governed by and construed in accordance
with the laws of the State of California. The parties shall attempt to resolve
all disputes between the parties arising out of or relating to this Standby
Purchase Agreement and all related agreements, collectively or separately (other
than disputes with respect to the selection of the Accountant, which shall be
governed by Section 4(b)) amicably through good faith discussions upon the
written request of any party. In the event that any such dispute cannot be
resolved thereby within a period of sixty (60) days after such notice has been
given (the last day of such sixty (60) day period being herein referred to as
the "Arbitration Date"), such dispute shall be finally settled by arbitration in
San Francisco, California, using the English language in accordance with the
Arbitration Rules and Procedures of JAMS then in effect, by one or more
commercial arbitrator(s) with substantial experience in resolving complex
commercial contract disputes, who may or may not be selected from the
appropriate list of JAMS arbitrators. If the Parties cannot agree upon the
number and identity of the arbitrators within fifteen (15) days following the
Arbitration Date, then a single arbitrator shall be selected on an expedited
basis in accordance with the Arbitration Rules and Procedures of JAMS. Any
arbitrator so selected shall have substantial experience in the software
industry. The arbitrator(s) shall have the authority to grant specific
performance and to allocate between the parties the costs of arbitration
(including service fees, arbitrator fees and all other fees related to the
arbitration) in such equitable manner as the arbitrator(s) may determine. The
prevailing party in the arbitration shall be entitled to receive reimbursement
of its reasonable expenses (including reasonable attorneys' fees, expert witness
fees and all other expenses) incurred in connection therewith. Judgment upon the
award so rendered may be entered in a court having jurisdiction or application
may be made to such court for judicial acceptance of any award and an order of
enforcement, as the case may be. Notwithstanding the foregoing, each Party shall
have the right to institute an action in a court of proper jurisdiction for
preliminary injunctive relief pending a final decision by the arbitrator(s),
provided that a permanent injunction and damages shall only be awarded by the
arbitrator(s). For all purposes of this Section 8, the parties consent to
exclusive jurisdiction and venue in the United States federal Courts located in
the Northern District of California. For the avoidance of doubt, the validity,
construction, and enforceability of this Agreement and the resolution of
disputes arising out of and relating to this Agreement and any related
agreements (other than an action solely between Nihon Ariba K.K. and Softbank
Commerce Corporation relating solely to the Amended Master Alliance Agreement),
collectively or separately, shall be governed solely by this Section 8,
notwithstanding that (i) the Amended Master Alliance Agreement is governed by
Japanese law and uses a different dispute resolution procedure or (ii) disputes
arising out of or relating to this Agreement are, or are asserted to, in any way
relate to or be based on similar facts as disputes arising out of or relating to
the Amended Master Alliance Agreement.

                                       5

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     9. Sole Obligation. Notwithstanding anything contained herein to the
contrary, the Parties acknowledge and agree that the sole obligation of SBEC
with respect to Revenue Targets, Revenue Commitments and [*] shall be to timely
make any [*] Payments in accordance with the terms hereof.

     10. Third Party Beneficiary. The parties acknowledge that Ariba is a third
party beneficiary of all of the Company's rights and all of SBEC's obligations
under this Agreement. Ariba may directly enforce any such rights and
obligations.

                                       6

<PAGE>

     Please indicate your acceptance of the foregoing by signing this Standby
Purchase Agreement in the space provided below.

                                       Very truly yours,

                                       SOFTBANK EC HOLDING CORP.

                                       By /s/ Ken Miyauchi
                                          --------------------------------------
                                          Name:  Ken Miyauchi
                                          Title:  President & CEO

Agreed and Accepted:

NIHON ARIBA K.K.

By: /s/ Kuniaki Watanabe
    ------------------------------
Name:  Kuniaki Watanabe
Title:  President and CEO

ARIBA, INC.

By: /s/ Robert M. Calderoni
    ------------------------------
Name:  Robert M. Calderoni
Title:  President & CEO

<PAGE>

                                    EXHIBIT A
                                   DEFINITIONS

     Alliance Partners: SOFTBANK Corp., SBEC, SOFTBANK Commerce Corp. and any
other entity Controlled by SOFTBANK Corp., that has been expressly authorized to
market, distribute, resell and/or license the Software and related services
under, and pursuant to the terms of, the Amended Master Alliance Agreement by
and between Nihon Ariba and SOFTBANK Commerce Corporation dated December 10,
2001 (including the Attachment for Reselling and the Addendum to the Attachment
for Reselling as each is incorporated therein, the "Amended Master Alliance
Agreement") or an Approved Purchase Agreement. "Controlled" means, with respect
to such entity, more than fifty percent (50%) of the outstanding shares of
securities of which (representing the right to vote for the election of
directors or other managing authority) are owned, directly or indirectly, by
SOFTBANK, but only so long as such ownership shall continue.

     Approved Purchase Agreement: Approved Purchase Agreement means an agreement
for the purchase of Software products from the Company by an Alliance Partner
that is approved by each of the Company and Ariba in writing in advance in its
sole discretion. Ariba's approval must include the approval of (i) an officer of
Ariba who also serves as a director of the Company or (ii) the Chief Financial
Officer of Ariba.

     [*]: Potential customers of the Company (i) listed on a schedule to be
provided by SBEC and approved by the Company, which consent shall not be
unreasonably withheld or (ii) mutually agreed upon by the Company and SBEC as
follows:

          Prior to commencing substantial sales efforts with respect to any
     potential [*] (a "Target"), SBEC shall notify the Company in writing
     identifying such Target, and provide the Company with any such
     documentation relating to such Target as may be reasonably requested by the
     Company. [*].

     Qualifying Revenue: The aggregate Revenue to the Company received after
September 1, 2001 from and only from each [*] (i) for support for the first year
for which support is rendered to such [*] (but no subsequent years) and (ii) for
Software product licensing (but not any revenue or other credit from consulting,
maintenance, training, education or other professional services). Qualifying
Revenue shall specifically exclude any Revenue attributable to or arising out of
Excluded Cash Payments.

     Excluded Cash Payments: Means [*] received by the Company in cash payments
prior to the date of this Standby Purchase Agreement which the parties agree are
associated with the end user licenses of Software products listed on Schedule I
hereto. The Parties hereto acknowledge that no Revenues attributable to such
Excluded Cash Payments shall constitute Qualifying Revenue or [*] Payments or
otherwise be applied towards satisfying the Revenue Commitments set forth herein
regardless of whether such payments are received before or after September 1,
2001. As a result, pursuant to this Standby Purchase Agreement, Nihon Ariba
shall be entitled to receive no less than [*] in cash payments in addition to
the Excluded Cash Payments.

                                      E-1

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     Revenue: Revenue shall mean amounts payable to the Company from Alliance
Partners represented on a Purchase Order with respect to Alliance Partner that
is received and accepted by the Company during the applicable Revenue Period.

     Revenue Commitment: Revenue Commitment shall mean, in each Revenue Period,
the amount of the Revenue Target that will be achieved either through the
payment of Qualifying Revenue by Alliance Partners or the payment of the [*] by
SBEC in accordance with this Standby Purchase Agreement (or both).

     Revenue Date: The last day of each respective Revenue Period as set forth
in Section 1(a) of this Standby Purchase Agreement.

     Revenue Period: The three month period that ends on each of the dates
specified in the table set forth in Section 1 of this Standby Purchase
Agreement, provided that the first Revenue Period shall be deemed to be a four
month period starting on September 1, 2001 and ending on December 31, 2001,
subject to the omission of all Revenue associated with Excluded Cash Payments,
as provided above.

     Revenue Target: The targeted level of Qualifying Revenue for each Revenue
Period as set forth in Section 1 of this Standby Purchase Agreement.

     [*]: [*] shall mean, for any Revenue Period, the amount, if any, by which
the Qualifying Revenue is [*] than the Revenue Target, provided that such [*]
shall be [*] on a dollar-for-dollar basis by an amount equal to the amount, if
any, by which the aggregate amount of Qualifying Revenue and [*] Payments for
all prior Revenue Periods exceeds the sum of the Revenue Targets for all prior
Revenue Periods.

     [*]: [*] means the aggregate [*] Payments received by the Company in cash
pursuant to Section 3(a) less the aggregate amount of cash remitted to SBEC
pursuant to Section 3(c).

     U.S. GAAP: Generally accepted accounting principles of the United States of
America.

                                      E-2

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                                       [*]

                                       S-1<PAGE>
                                                                   EXHIBIT 10.26

*Represents confidential information for which Ariba, Inc. is seeking
confidential treatment with the Securities and Exchange Commission.

                  RELEASE, REIMBURSEMENT AND PAYMENT agreement

         This Release, Reimbursement and Payment Agreement (the "Agreement") is
made as of December 10, 2001 (the "Effective Date") by and among Ariba, Inc.
("Ariba"), Nihon Ariba K.K. ("Nihon Ariba"), SOFTBANK Corp. ("Softbank"), and
SOFTBANK EC Holdings Corp., which is previously known as SOFTBANK E-Commerce
Corp. ("Softbank ECH") (collectively, the "Parties"). Capitalized terms used and
not otherwise defined herein shall have meanings set forth in the Amended
Agreements (as defined below).

                                    RECITALS

WHEREAS, the Parties have individually and separately entered into the following
agreements, each (except for the Alliance Agreement described below) dated as of
October 19, 2000 (collectively, including the Alliance Agreement, the "Previous
Agreements"):

         1.   Stock Purchase Agreement by and among Nihon Ariba, Softbank and
Softbank ECH (the "Original Stock Purchase Agreement");

         2.   Shareholders Agreement by and among Softbank, Softbank ECH, Ariba
and Nihon Ariba;

         3.   Software License Agreement by and between Nihon Ariba and Ariba;

         4.   Letter agreement by and between Ariba and Softbank; and

         5. Master Alliance Agreement by and between Nihon Ariba and Softbank
Commerce Corporation dated April 1, 2001 (the "Alliance Agreement"), including
the Attachment for Reselling of the same date and the Addendum to the Attachment
for Reselling; Appointment of Dealers of the same date;

WHEREAS, concurrently herewith, the Parties have individually and separately
entered into the following agreements, each dated as of the Effective Date, in
order to amend, supplement and/or replace the Previous Agreements (collectively,
the "Amended Agreements"):

         1. Amendment No. 1 to Stock Purchase Agreement by and among Nihon
Ariba, Softbank and Softbank ECH (the Original Stock Purchase Agreement as
amended by such Amendment No. 1, the "Stock Purchase Agreement");

         2. First Amended and Restated Shareholders Agreement by and among,
Softbank, Softbank ECH, Ariba and Nihon Ariba (the "Shareholders Agreement");

         3. Distribution Agreement by and between Nihon Ariba and Ariba (the
"Distribution Agreement");

                                       1

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         4. Amended and restated letter agreement by and between Ariba and
Softbank (the "Letter Agreement");

         5. Standby Purchase Agreement by and between Softbank ECH, Nihon Ariba,
and Ariba (the "Standby Purchase Agreement"); and

         6. Amended Master Alliance Agreement by and between Nihon Ariba and
Softbank Commerce Corporation ("SBC") dated December 10, 2001 (the "Amended
Alliance Agreement"), including the Attachment for Reselling of the same date
(the "Attachment") and the Addendum to the Attachment for Reselling; Appointment
of Dealers of the same date (the "Addendum"); and

WHEREAS, the Parties have determined that a change in conditions has made the
Amended Agreements desirable for all Parties in order to adjust the Parties'
obligations to the current market for technology products and services.

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

                                   AGREEMENT.

1.   Release.
     --------
         (a) Each Party does hereby release and forever discharge the other
Parties and each of their respective past, present and future shareholders,
directors, officers, employees, affiliates and agents and their respective
successors and assigns (collectively, the "Released Persons") of and from any
and all claims, debts, liabilities, costs, actions, demands, contracts, suits,
expenses, damages, actions and causes of action of any kind or nature (known or
unknown) which a Party giving such release may now or hereafter have or claim to
have against the Released Persons for whose benefit the release is given which
in any way arise from, relate to or are connected to the Stock Purchase
Agreement by and among Nihon Ariba, Softbank and Softbank ECH dated October 19,
2000, the Shareholders Agreement by and among Softbank, Softbank ECH, Ariba and
Nihon Ariba dated October 19, 2000, the Software License Agreement by and
between Nihon Ariba and Ariba dated October 19, 2000, the Letter Agreement by
and between Ariba and Softbank dated October 19, 2000, and the Master Alliance
Agreement by and between Nihon Ariba and Softbank Commerce Corporation dated
April 1, 2001, including the Attachment for Reselling of the same date and the
Addendum to the Attachment for Reselling; Appointment of Dealers of the same
date in each case prior to its being amended, supplemented, or replaced on the
Effective Date. However, such release and discharge specifically excludes any
and all claims, debts, liabilities, costs, actions, demands, contracts, suits,
expenses, damages, actions and causes of action arising out of or related to (a)
a breach by Softbank Commerce Corporation of Sections 2 or 10 of the Alliance
Agreement, (b) any payment obligations owing from Nihon Ariba to Ariba, and (c)
any obligations contained in the agreements entered into by the Parties relating
to Ariba Korea Ltd., including Stock Purchase Agreement, Schedule of Exceptions,
Shareholders Agreement, License Agreement, Letter Amending the Stock Purchase
Agreement, Non-Disclosure Agreement, Side Letter, and Asset Transfer Agreement.
This release shall not affect the rights and obligations of the Parties to the
Amended Agreements, which shall be in full

                                       2

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force and effect.

         (b) Each Party agrees that it will forever refrain and forebear from
instituting, commencing, or prosecuting any litigation, action or other
proceeding against the Released Persons based on, or arising out of or in
connection with any claim, debt, liability, obligation, demand, contract, costs,
expense, action or cause of action that is released and discharged by reason of
this Agreement.

         (c) Each Party hereby waives and relinquishes any and all rights and
benefits afforded by Section 1542 of the Civil Code of the State of California
(or any analogous law or regulation) which reads as follows:

         "A general release does not extend to claims which the creditor does
         not know or suspect to exist in his favor at the time of executing the
         release, which if known by him must have materially affected his
         settlement with the debtor."

2. Reimbursement for Nihon Ariba Employees. The Parties agree that as marketing
   ---------------------------------------
assistance, Softbank ECH shall, with respect to each calendar quarter during the
Support Period, pay Nihon Ariba an amount equal to [*], in each case for the
applicable quarter. For the purposes of this paragraph, [*]. Softbank ECH's
obligations hereunder relate to quarters during the "Support Period," which
shall mean the period commencing on [*] and continuing until [*]. The "[*]"
shall mean, for a calendar quarter during the Support Period, the [*] for whom
Softbank ECH shall reimburse the [*] to Nihon Ariba. The [*] shall be determined
as follows based on [*]:

         [*]

"Employee(s)," for the purposes of this Section 2, means the (A) person(s)
employed by Nihon Ariba at the end of the applicable quarter, and (B) open
full-time work position(s) for which Nihon Ariba is seeking to hire new
employee(s) in good faith at the end of the applicable quarter.

Promptly following the end of each calendar quarter during the Support Period,
Nihon Ariba shall deliver to Softbank ECH a written statement of the
reimbursement payment owed by Softbank ECH for such quarter, including (i) a
calculation of the [*] for the quarter, (ii) [*] and (iii) [*] at the end of the
quarter. Not later than three (3) business days following its receipt of such
statement, Softbank ECH shall pay the reimbursement amount set forth in such
statement.

3. Payment Obligations. To induce Nihon Ariba to enter into the Amended Alliance
   -------------------
Agreement and for other good and valuable consideration, the receipt of which is
hereby acknowledged, Softbank, hereby intending to be legally bound,
unconditionally and irrevocably agrees to pay to Nihon Ariba and Ariba, whether
on payment due dates or by acceleration or otherwise, the following amounts due
and interest:

         [*] Payments. If on any [*] Date (as defined in the Standby Purchase
Agreement) Softbank ECH fails to make a [*] Payment (as defined in the Standby
Purchase Agreement) when due for any reason, then Softbank shall make such [*]
Payment in accordance with Section 3 of the Standby Purchase Agreement by
paying, within two (2) business days of such [*] Date,

                                       3

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the [*] Payment amount otherwise required to be paid by Softbank ECH in
accordance with the Standby Purchase Agreement with respect to the Revenue
Commitment (as defined in the Standby Purchase Agreement) in question.

         (b) Fee Payments. If on any date which any payment is due under Section
             ------------
4.1 of the Amended Alliance Agreement (each a "Fee Payment," and together with
the [*] Payments, and the payments of Variable Costs required under Section 2
above the "Payments"), Nihon Ariba does not receive such Fee Payment in full for
any reason, then Softbank shall make such payment in accordance with Section 4.1
of the Amended Alliance Agreement by paying, within two (2) business days of
such Fee Payment due date, the unpaid amount of such Fee Payment. The obligation
of Softbank to make Fee Payments to Nihon Ariba pursuant to this Section 3(b)
shall terminate when Nihon Ariba shall have received an aggregate of [*] in cash
for Qualifying Revenues (as defined in the Standby Purchase Agreement),
including [*] Payments. For the avoidance of doubt, any Excluded Cash Payments
(as defined in the Standby Purchase Agreement) received by Nihon Ariba shall not
be included as part of such [*].

         (c) Variable Cost Payments. If on any date which any payment of [*] is
             ----------------------
due under Section 2 above (each, a "[*]"), Softbank ECH fails to make such
payment when due for any reason, then Softbank shall make such payments in
accordance with Section 2 above by paying, within two (2) business days of such
[*], the amount otherwise required to be paid by Softbank ECH in accordance with
Section 2 above.

         (d) Continuing Nature of Payment Obligations. The payment obligations
             ----------------------------------------
of Sections 3(a), 3(b) and 3(c) are continuing payment obligations, including
obligations under future transactions that either increase or continue the
Payments, or from time to time, renew Payments that have been satisfied.

         (e) Independent Payment Obligation. The payment obligations of Softbank
             ------------------------------
hereunder are independent of all other obligations of Softbank, Softbank ECH,
SBC or any other party affiliated with Softbank (collectively, the "Softbank
Parties") under any agreement, and Nihon Ariba and/or Ariba may, upon occurrence
of any default hereunder, proceed in the enforcement hereof independently of,
and without affecting any other right or remedy that Nihon Ariba and/or Ariba
may at any time have or hold with respect to any obligations of Softbank or any
affiliate under any agreement. Nihon Ariba and/or Ariba may proceed with an
action against Softbank regardless of whether action is brought with respect to
any of Softbank ECH or SBC. The liability of Softbank hereunder to Nihon Ariba
and/or Ariba shall be reinstated and revived, and the rights of Nihon Ariba and
Ariba shall continue, with respect to any Payment which thereafter shall be
required to be restored or returned by Nihon Ariba and/or Ariba for any reason
as though such amount had not been paid. The liability of Softbank hereunder and
the enforceability of this Section 3 shall remain effective with respect to the
full amount and extent of all Payments and interest on such Payments, even
though the obligations of this Section 3 or any part thereof may be or hereafter
may become invalid or otherwise unenforceable as against any of Softbank or
Softbank ECH or SBC. For the avoidance of doubt, the obligation of Softbank
under this Section 3 shall remain in full force and effect notwithstanding the
termination of the Standby Purchase Agreement, the Distribution Agreement or the
Amended Alliance Agreement (including, without limitation, the Attachment and
Addendum) or the

                                       4

<PAGE>

occurrence of a Modification Event or a Payment Failure (as such terms are
defined in the Distribution Agreement).

         (f) Waiver of Defenses. Softbank expressly waives any right to require
             -------------------
Nihon Ariba and/or Ariba, prior to or as a condition to the enforcement of this
Section 3, to proceed against Softbank ECH or SBC or pursue any other remedy in
Nihon Ariba's or Ariba's power. Softbank expressly waives any defense to the
obligations set forth in this Section 3 that it may have for itself or exercise
on behalf of Softbank ECH or SBC. Until all Payments have been paid in full,
Softbank shall have no right of subrogation, and expressly waives any right to
enforce any remedy which Softbank ECH or SBC now has or hereafter may have
against Nihon Ariba and/or Ariba. Softbank expressly waives all setoffs and
counterclaims and all presentments, demands for performance, notices of
nonperformance, protests, notices of protest, notices of dishonor, and all other
notices of any kind or nature whatsoever with respect to the Payments, and
notices of acceptance of the obligations set forth in this Section 3 and of the
existence, creation, or incurring of new or additional Payments. Softbank
waives, to the fullest extent allowed by law, the benefit of any statute of
limitations affecting Softbank's liability hereunder or the enforcement of this
Section 3. Softbank assumes all responsibility for being and keeping itself
informed of both Softbank ECH's and SBC's financial condition and agrees that
neither Nihon Ariba nor Ariba shall have any duty to advise Softbank of
information regarding such condition or any such circumstances.

         (g) Insolvency. If any of Softbank ECH or SBC becomes insolvent or is
             -----------
adjudicated bankrupt or files a petition for reorganization, arrangement,
composition or similar relief under any present or future provision of
applicable bankruptcy laws, or if such a petition is filed against any of
Softbank ECH or SBC, and in any such proceeding some or all of the Payments are
terminated or rejected or any of the Payments are modified or abrogated, or if
the Payments are otherwise avoided for any reason, Softbank's undertakings and
obligations hereunder shall not thereby be affected or modified and shall
continue in full force and effect as if no such action or proceeding had
occurred. This Agreement shall continue to be effective or be reinstated, as the
case may be, if Ariba must return any payment received with respect to the
Payments upon the insolvency, bankruptcy or reorganization of any of Softbank
ECH or SBC, Softbank, or otherwise, as though such payment had not been made.

The parties acknowledge and agree that, without in any way diminishing any
obligations set forth herein, or any of the rights or remedies of Nihon Ariba
K.K. or Ariba hereunder or otherwise, Softbank and Softbank ECH SB shall be
jointly and severally liable for the obligations set forth in this Section 3.

4. Governing Law; Dispute Resolution. The validity, construction and
   ---------------------------------
enforceability of this Agreement and the Amended Agreements (except the Amended
Master Alliance Agreement only to the extent that an action completely arises
solely between Nihon Ariba K.K. and Softbank Commerce Corporation and solely out
of the Amended Master Alliance Agreement), collectively or separately, shall be
governed by and construed in accordance with the laws of the State of
California. The Parties shall attempt to resolve all disputes between the
Parties arising out of or relating to this Agreement and the Amended Agreements
amicably through good faith discussions upon the written request of any Party.
In the event that any such dispute cannot be

                                       5

<PAGE>

resolved thereby within a period of sixty (60) days after such notice has been
given (the last day of such sixty (60) day period being herein referred to as
the "Arbitration Date"), such dispute shall be finally settled by arbitration in
San Francisco, California, using the English language in accordance with the
Arbitration Rules and Procedures of JAMS then in effect, by one or more
commercial arbitrator(s) with substantial experience in resolving complex
commercial contract disputes, who may or may not be selected from the
appropriate list of JAMS arbitrators. If the Parties cannot agree upon the
number and identity of the arbitrators within fifteen (15) days following the
Arbitration Date, then a single arbitrator shall be selected on an expedited
basis in accordance with the Arbitration Rules and Procedures of JAMS. Any
arbitrator so selected shall have substantial experience in the software
industry. The arbitrator(s) shall have the authority to grant specific
performance and to allocate between the Parties the costs of arbitration
(including service fees, arbitrator fees and all other fees related to the
arbitration) in such equitable manner as the arbitrator(s) may determine. The
prevailing Party in the arbitration shall be entitled to receive reimbursement
of its reasonable expenses (including reasonable attorneys' fees, expert witness
fees and all other expenses) incurred in connection therewith. Judgment upon the
award so rendered may be entered in a court having jurisdiction or application
may be made to such court for judicial acceptance of any award and an order of
enforcement, as the case may be. Notwithstanding the foregoing, each Party shall
have the right to institute an action in a court of proper jurisdiction for
preliminary injunctive relief pending a final decision by the arbitrator(s),
provided that a permanent injunction and damages shall only be awarded by the
arbitrator(s). For all purposes of this Section 4, the Parties consent to
exclusive jurisdiction and venue in the United States federal Courts located in
the Northern District of California. For the avoidance of doubt, the validity,
construction, and enforceability of this Agreement and the resolution of
disputes arising out of and relating to this Agreement and any related
agreements (other than an action solely between Nihon Ariba K.K. and Softbank
Commerce Corporation relating solely to the Amended Master Alliance Agreement),
collectively or separately, shall be governed solely by this Section 4,
notwithstanding that (i) the Amended Master Alliance Agreement is governed by
Japanese law and uses a different dispute resolution procedure or (ii) disputes
arising out of or relating to this Agreement are, or are asserted to, in any way
relate to or be based on similar facts as disputes arising out of or relating to
the Amended Master Alliance Agreement.

5. General. Except as expressly modified by this Agreement, all terms,
   -------
conditions and provisions of the Amended Agreements shall continue in full force
and effect in accordance with their terms. In the event of a conflict between
the terms and conditions of this Agreement, and the terms of any of the Amended
Agreements, the terms and conditions of this Agreement shall prevail. Each Party
represents and warrants to the other Parties that its execution and delivery of
this Agreement has been duly authorized, and that this Agreement constitutes its
valid and legally binding obligation. Each Party agrees that together with the
Amended Agreements, this Agreement, constitutes the complete and exclusive
statement of the agreement between the Parties, and supersedes all proposals and
understandings, oral and written, relating to the subject matter of this
Agreement and the Amended Agreements. From the date hereof, references to the
Amended Agreements shall be deemed to be the Transaction Agreements as
supplemented by this Agreement. This Agreement may not be modified or rescinded
except in a writing signed by each of the Parties.

                                       6

<PAGE>

         IN WITNESS WHEREOF, the Parties have caused this Agreement to be
executed by their respective duly authorized representatives:

Nihon Ariba K.K.                              SOFTBANK Corp.

By:     /s/ Kuniaki Watanabe                  By:    /s/ Masayoshi Son
        --------------------------------             ---------------------------
Name:   Kuniaki Watanabe                      Name:  Masayoshi Son
        --------------------------------             ---------------------------
Title:  President and CEO                     Title: President and CEO
        --------------------------------             ---------------------------

Ariba, Inc.                                   SOFTBANK EC Holdings Corp.

By:     /s/ Robert M. Calderoni               By:    /s/ Ken Miyauchi
        --------------------------------             ---------------------------
Name:   Robert M. Calderoni                   Name:  Ken Miyauchi
        --------------------------------             ---------------------------
Title:  President and CEO                     Title: President and CEO
        --------------------------------             ---------------------------

         SIGNATURE PAGE TO RELEASE, REIMBURSEMENT AND PAYMENT AGREEMENT

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