Document:

<PAGE>

                                                                   EXHIBIT 10.29

                                 AVANTGO, INC.

                      ADDENDUM TO SERIES D PREFERRED STOCK

                               PURCHASE AGREEMENT
                               ------------------

     This Addendum to Series D Preferred Stock Purchase Agreement (the

"Addendum") is made as of the 7th day of April, 2000 by and among AvantGo, Inc.,
 --------
a Delaware corporation (the "Company"), and the entities listed on Exhibit A
                             -------
attached hereto  (the "Additional Purchasers").
                       ---------------------

                                    RECITALS

     On March 8, 2000, the Company entered into a Series D Preferred Stock
Purchase Agreement (the "Purchase Agreement") with certain investors set forth
                         ------------------
on Exhibit A attached thereto, which provides that the Company may sell all of
   ---------
the shares of the Company's authorized but unissued Series D Preferred Stock
(the "Additional Shares") to the Additional Purchasers and that, under
      -----------------
conditions set forth therein, the Additional Purchasers may become parties to
the Purchase Agreement and the Ancillary Agreements (as defined in the Purchase
Agreement).  All terms not defined herein shall have the meaning ascribed
thereto in the Purchase Agreement.

                                   AGREEMENT

     In consideration of the mutual promises, covenants and conditions
hereinafter set forth, the parties hereto mutually agree as follows:

1.   Sale of Preferred Stock.

     Subject to the terms and conditions hereof, at the Closing (as defined in
Section 2.1 hereof) the Company will issue and sell to each Additional
Purchaser, and each Additional Purchaser severally agrees to purchase from the
Company, that number of Additional Shares specified opposite such Additional
Purchaser's name on Exhibit A hereto, at a cash purchase price of $8.36 per
                    ---------
share. Each of the Additional Purchasers, by their signatures hereto, shall
hereby (i) become parties to the Purchase Agreement, (ii) be considered a
"Purchaser" for all purposes under the Purchase Agreement and (iii) have all the
----------
rights and obligations of a Purchaser thereunder. The Additional Shares acquired
by the Additional Purchasers hereunder shall be considered "Series D Preferred
                                                            ------------------
Stock" for all purposes under the Purchase Agreement, as amended.
-----

2.   Closing; Delivery.

     2.1  Closing.

          The closing of the purchase and sale of the Additional Shares
hereunder (the "Closing") shall be held at the offices of Perkins Coie LLP,
Menlo Park, California, at 1:00 PM., on April 7th, 2000, or at such other time
and place as the Company and the Additional Purchasers may agree.

<PAGE>

     2.2  Delivery.

          At the Closing, the Company will deliver to each Additional Purchaser
a certificate representing the number of Additional Shares set forth opposite
such Additional Purchaser's name on Exhibit A, against payment of the purchase
                                    ---------
price therefor by each Additional Purchaser by check payable to the Company or
by wire transfer to the Company at its account maintained by Perkins Coie LLP,
or by any combination thereof.

3.   Disclosure.

          Each Additional Purchaser hereby acknowledges receipt of the Purchase
Agreement and the exhibits thereto. The Company affirms to each Additional
Purchaser that:

          (i)  The representations and warranties of the Company set forth in
Section 2 of the Purchase Agreement were true and accurate when made;

          (ii) The representations and warranties set forth in Section 2 of the
Purchase Agreement, which are incorporated herein by reference and made a part
hereof, remain true and accurate as of the date hereof, except (A) for changes
resulting from the transactions contemplated in the Purchase Agreement and (B)
as set forth in the Schedule of Exceptions to Representations and Warranties
attached hereto as Exhibit B.
                   ---------

          (iii)  The conditions to closing set forth in Section 4 of the
Purchase Agreement and in Section 5 hereof have been satisfied, provided that
the conditions set forth in Section 4.1 of the Purchase Agreement shall include
references to changes in the Company's representations and warranties and the
Company's status, respectively, as set forth herein and in the Exhibits attached
hereto, and resulting from the consummation of the transactions contemplated by
the Purchase Agreement.

4.   Representations and Warranties of Additional Purchasers.

     4.1  Incorporation of Representations.

     Each Additional Purchaser acknowledges that such Additional Purchaser has
reviewed the representations and warranties set forth in Section 3 of the
Purchase Agreement and agrees with the Company that such representations and
warranties, which are incorporated herein by this reference and made a part
hereof, are true and correct as of the date hereof as they relate to such
Additional Purchaser's purchase of the Additional Shares hereunder.

     4.2  Additional Representations by Foreign Purchasers.

     If an Additional Purchaser is not a United States person, such Additional
Purchaser hereby represents that he or she has satisfied himself or herself as
to the full observance of the laws of his or her jurisdiction in connection with
any invitation to subscribe for the Securities or any use of this Agreement,
including (i) the legal requirements within his jurisdiction for the purchase of
the Securities, (ii) any foreign exchange restrictions applicable to such
purchase, (iii) any governmental or other consents that may need to be obtained,
and (iv) the income tax

                                      -2-
<PAGE>

and other tax consequences, if any, that may be relevant to the purchase,
holding, redemption, sale, or transfer of the Securities. Such Additional
Purchaser's subscription and payment for, and his or her continued beneficial
ownership of the Securities, will not violate any applicable securities or other
laws of his or her jurisdiction.

5.   Conditions to Additional Purchasers' Obligations at Closing.

          The obligation of each Additional Purchaser to purchase the Additional
Shares at the Closing is subject to the fulfillment to such Additional
Purchaser's satisfaction at or prior to the Closing of the following conditions:

     5.1  Representations and Warranties Correct: Performance of Obligations.

          The representations and warranties made by the Company in Section 3
hereof, including the representations and warranties incorporated by reference
from Section 2 of the Purchase Agreement, were true and correct in all material
respects when made, and shall be true and correct in all material respects on
and as of the date of the Closing with the same force and effect as if they had
been made on and as of said date; and the Company shall have performed all
obligations and conditions herein required to be performed or observed by it at
or prior to the Closing.

     5.2  Legal Opinion.

          Each of the Additional Purchasers shall have received from Perkins
Coie LLP, legal counsel for the Company, an opinion, dated as of the Closing, in
substantially the form of Exhibit C.

     5.3  Compliance Certificate.

          The President of the Company shall deliver to the Purchasers at the
Closing a certificate certifying that the conditions specified in Section 5.1
have been fulfilled.

6.   Conditions to Company's Obligations at Closing.

          The obligations of the Company under Section 1 of this Addendum are
subject to the fulfillment at or before the Closing of each of the following
conditions:

     6.1  Representations and Warranties.

          The representations and warranties of each Additional Purchaser
contained in Section 4 hereof shall be true at the Closing.

7.   Miscellaneous.

     7.1  Survival of Warranties.

                                      -3-
<PAGE>

          Unless otherwise set forth in this Addendum the warranties,
representations and covenants of the Company and the Purchasers contained in or
made pursuant to this Addendum shall survive the execution and delivery of this
Addendum and the Closing.

     7.2  Incorporation by Reference.

          The provisions set forth in Section 6 of the Purchase Agreement (other
than Sections 6.1 and 6.6) are incorporated herein by this reference and made a
part hereof.

     7.3  Notices.

          Any notice required or permitted by this Addendum shall be in writing
and shall be deemed sufficient upon delivery, when delivered personally or by
overnight courier or sent by telegram or fax, or forty-eight (48) hours after
being deposited in the U.S. mail, as certified or registered mail, with postage
prepaid, addressed to the party to be notified at such party's address as set
forth below or on Exhibit A hereto, or as subsequently modified by written
                  ---------
notice, and if to the Company, with a copy to Perkins Coie LLP, 135 Commonwealth
Drive, Suite 250, Menlo Park, California 94025 fax (650) 752-6050, Attn: Ralph
L. Arnheim III.

     7.4  Counterparts.

          This Addendum may be executed in any number of counterparts, each of
which may be executed by less than all of the Additional Purchasers, each of
which shall be enforceable against the parties actually executing such
counterparts, and all of which together shall constitute one instrument.

                            [Signature Page Follows]

                                      -4-
<PAGE>

     The parties hereto have executed this Addendum as of the date first set
forth above.

                              AVANTGO, INC.

                              By:   /s/ Felix Lin
                                    -------------------------------------------
                                    Felix Lin, Chairman of the Board

                              PURCHASER:

                              RESEARCH IN MOTION USA CORPORATION

                              25227 Grogan's Mill Road
                              Suite 125
                              The Woodlands, TX
                              77382-1020

                              By: /s/  Illegible for
                                 --------------------------------------

                              Printed Name: Charles B. Meyer

                              Title:        Director

                              ADDITIONAL PURCHASER:

                                      Thomas J. Meredith & Lynn M. Meredith,
                                                     Trustees
                                            Meredith Family Revocable Trust
                              -------------------------------------------------
                              (Purchaser Name)   u/a/d 12-16-94 amended 9-30-99

                              By: /s/ Pam Meredith
                                 ----------------------------------------------
                              Name: Thomas J. Meredith
                                   --------------------------------------------

                              Title: Trustee
                                    -------------------------------------------

                              Address: 70 Pascal Lane
                                      -----------------------------------------
                                      Austin, TX 78746
                              -------------------------------------------------

                              Fax:  512-329-0532
                                  ---------------------------------------------

                              ADDITIONAL PURCHASER:

                               /s/ R. Blumenthal
                              -------------------------------------------------
                              (Purchaser Name)

                              By: Randy Blumenthal
                                 ----------------------------------------------
                              Name:
                                   --------------------------------------------

                              Title:
                                    -------------------------------------------

                              Address: 2765 Sandhill Road
                                      -----------------------------------------
                                       Menlo Park, CA 94028
                              -------------------------------------------------

                              Fax:     650-234-3610
                                  ---------------------------------------------

                              ADDITIONAL PURCHASER:

                              Curtis H. Smith
                              -------------------------------------------------
                              (Purchaser Name)

                              By:/s/ Curtis H. Smith
                                 ----------------------------------------------
                              Name: Curtis H. Smith
                                   --------------------------------------------

                              Title:
                                    -------------------------------------------

                              Address: 15 San Antonio Place #303
                                      -----------------------------------------
                                       San Francisco, CA 94133
                              -------------------------------------------------

                              Fax: 650-320-2452
                                  ---------------------------------------------

                              ADDITIONAL PURCHASER:

                              TWB Investment Partnership L.P.
                              -------------------------------------------------
                              (Purchaser Name)

                              By: /s/ Robert E. Giles
                                 ----------------------------------------------
                              Name: Robert E. Giles
                                   --------------------------------------------

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

                              Address: 1201 Third Avenue 40th Floor
                                      -----------------------------------------
                                       Seattle, WA 98101
                              -------------------------------------------------

                              Fax:     206-583-8500
                                  ---------------------------------------------

                              ADDITIONAL PURCHASER:

                                Broadway SLP
                              -------------------------------------------------
                              (Purchaser Name)

                              By: /s/ Peter Mooney
                                 ----------------------------------------------
                              Name: Peter Mooney
                                   --------------------------------------------

                              Title: CFO of its GP Broadway Scottish LLC
                                    -------------------------------------------

                              Address:
                                      -----------------------------------------

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

                              Fax:
                                  ---------------------------------------------

                              ADDITIONAL PURCHASER:

                              SKGF Investments-2000-1, L.L.C.
                              -------------------------------------------------
                              (Purchaser Name)

                              By:/s/ Jorge A. Goldstein
                                 ----------------------------------------------
                              Name: Jorge A. Goldstein
                                   --------------------------------------------

                              Title: Manager
                                    -------------------------------------------

                              Address: 1100 New York Avenue, Suite 600 NW
                                      -----------------------------------------
                                       Washington, D.C. 20005
                              -------------------------------------------------

                              Fax: (202) 371-2540
                                  ---------------------------------------------

                                      -5-

<PAGE>

                              ADDITIONAL PURCHASER:

                               Allen & Company Incorporated
                              -------------------------------------------------
                              (Purchaser Name)

                              By:    /s/ Kim Wieland
                                 ----------------------------------------------
                              Name:  Kim M. Wieland
                                   --------------------------------------------

                              Title:  CFO & Managing Director
                                    -------------------------------------------

                              Address:  74 Fifth Ave
                                      -----------------------------------------
                                        NY, NY 10022
                              -------------------------------------------------

                              Fax:  212-832-7116
                                  ---------------------------------------------

                              ADDITIONAL PURCHASER:

                              Write Image Limited
                              -------------------------------------------------
                              (Purchaser Name)

                              By:    /s/ Stephen Ellis
                                 ----------------------------------------------
                              Name:  Stephen Ellis
                                   --------------------------------------------

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

                              Address:  271 Regent Street
                                      -----------------------------------------
                               London, WIR 8BP UK
                              -------------------------------------------------
                              Fax:  44(0) 20 7493 5499
                                  ---------------------------------------------

                              ADDITIONAL PURCHASER:

                              ANGEL (0) INVESTORS II, L.P.
                              -------------------------------------------------
                              (Purchaser Name)

                              By:    ArchAngel II, LLC its general partner
                                 ----------------------------------------------
                              Name:  /s/ J. Casey McGlynn
                                   --------------------------------------------
                                     J. Casey McGlynn
                              Title:  Member
                                    -------------------------------------------

                              Address:  c/o Wilson Sonsini Goodrich & Rosati
                                      -----------------------------------------
                                       650 Page Mill Road, Palo Alto, CA 94304
                              -------------------------------------------------

                              Fax:  650-496-4082
                                  ---------------------------------------------

                              ADDITIONAL PURCHASER:

                              SCOTT BONHAM

                              -------------------------------------------------
                              (Purchaser Name)

                              By:    /s/ S Bonham
                                 ----------------------------------------------
                              Name:  Scott Bonham
                                   --------------------------------------------

                              Title:  Vice President, Capital Group
                                    -------------------------------------------

                              Address:  253 30th Avenue
                                      -----------------------------------------
                                San Francisco, CA 94121
                              -------------------------------------------------

                              Fax:
                                  ---------------------------------------------

                              ADDITIONAL PURCHASER:

                              DRW VENTURE PARTNERS LP
                              -------------------------------------------------
                              (Purchaser Name)

                              By:    /s/ Mary Zimmer
                                 ----------------------------------------------
                              Name:  Mary Zimmer
                                   --------------------------------------------

                              Title:  Director Finance & Administration
                                    -------------------------------------------

                              Address:  60 South 6th Street
                                      -----------------------------------------
                               Minneapolis, MN 55402
                              -------------------------------------------------

                              Fax:  612-373-1610
                                  ---------------------------------------------

                              ADDITIONAL PURCHASER:

                                THE LEASING GROUP PLC
                              -------------------------------------------------
                              (Purchaser Name)

                              By:    /s/ Tom Melvin
                                 ----------------------------------------------
                              Name:  Tom Melvin
                                   --------------------------------------------

                              Title:  Group Director
                                    -------------------------------------------

                              Address:  42 Kenavon Drive
                                      -----------------------------------------
                                 Reading, Berkshire RGI 3DJ
                              -------------------------------------------------

                              Fax:  011 44 1189 293561
                                  ---------------------------------------------

                                      -6-
<PAGE>

                                   EXHIBIT A

                       SCHEDULE OF ADDITIONAL PURCHASERS

    Name and Address of
    -------------------
    Additional Purchaser
    --------------------

RIM USA Capital Corporation
295 Phillip Street
Waterloo, Ontario
Canada N2L 3W8
Fax: (519) 888-6906

Broadview SLP
950 Tower Lane, 18th Floor
Foster City, CA 94404-2130
Fax: 650 378-4710

DRW Venture Partners L.P.
Dain Rauscher Plaza
60 South Sixth Street
Minneapolis, MN 55402
Fax: (612) 373-1610

Allen & Company Incorporated
711 Fifth Avenue
New York, NY 10022
Fax: (212) 508-5839

Angel (Q) Investors II, L.P.
C/O J. Casey McGlynn
650 Page Mill Road
Palo Alto, CA 94304
Fax: (650) 493-6811

The Leasing Group, plc
42 Kenavon Drive
Reading
Berkshire RG1 3DJ

Write Image Limited
271 Regent Street
London W1R 8BP
<PAGE>

    Name and Address of          Number of Shares        Total Purchase Price
    -------------------          ----------------        --------------------
    Additional Purchaser
    --------------------

Randy Blumenthal
2765 Sand Hill Road
Menlo Park, CA 94025

Meredith Family Revocable Trust
u/a/d 12/16/94, amended 9/30/99
C/O Thomas Meredith
70 Pascal Lane
Austin, TX 78746

Curtis Smith
15 San Antonio Place #303
San Francisco, CA 94133

Scott Bonham
283 30/th/ Avenue
San Francisco, CA 94121

TWB Investment Partnership
1201 Third Avenue, 40/th/ Floor
Seattle, WA 98101
Fax: (206) 587-8500

SKGF Investments-2000-1, L.L.C.
1100 New York Ave #600 N.W.
Washington, D.C. 20005

                                      -2-

<PAGE>
                                                                       Exhibit C

                       [LETTERHEAD OF PERKINS COIE LLP]

                                 April 7, 200O

To the Additional Purchasers Listed on the
Schedule of Investors to the AvantGo, Inc.
Addendum to Series D Preferred Stock
Purchase Agreement dated as of April 7, 200O

Ladies and Gentlemen:

          We have acted as counsel for AvantGo, Inc., a Delaware corporation
(the "Company"), in connection with the issuance and sale of an additional
436,599 shares of its Series D Preferred Stock pursuant to the AvantGo, Inc.
Addendum to Series D Preferred Stock Purchase Agreement dated as of April 7,
2000 (the "Addendum") between the Company and you. This opinion is being
rendered to you pursuant to Section 5.2 of the Addendum in connection with the
Additional Closing of the sale of the Series D Preferred Stock. Capitalized
terms not otherwise defined in this opinion have the meaning given them in that
certain Series D Preferred Stock Purchase Agreement dated as of March 8/th/,
2000.

          In connection with the opinions expressed herein we have made such
examination of matters of law and of fact as we considered appropriate or
advisable for purposes hereof. As to matters of fact material to the opinions
expressed herein, we have relied upon the representations and warranties as to
factual matters contained in and made by the Company pursuant to the Addendum, a
certificate of officers of the Company (the "Officers' Certificate") and other
certificates and statements of government officials. We have also examined
originals or copies of such corporate documents or records of the Company as we
have considered appropriate for the opinions expressed herein. We have assumed
for the purposes of this opinion that the signatures on documents and
instruments examined by us are authentic, that each document is what it purports
to be, and that all documents submitted to us as copies or facsimiles conform
with the originals, which facts we have not independently verified. We have not
conducted a docket search in any jurisdiction with respect to litigation that
may be pending against the Company or any of its officers or directors or
undertaken any further inquiry other than as stated herein.

          In rendering this opinion we have also assumed: (A) that the Addendum,
the Third Amended and Restated Investor Rights Agreement (the "Investor Rights
Agreement"), the Third

 ANCHORAGE BELLEUVE BOISE DENVER HONG KONG LOS ANGELES MENLO PARK PORTLAND SAN
              FRANCISCO SEATTLE SPOKANE TAIPEI WASHINGTON, D.C.
           STRATEGIC ALLIANCE: RUSSELL & DUMOULIN, VANCOUVER, CANADA
<PAGE>

To the Additional Purchasers Listed on the                         April 7 ,200O
Schedule of Investors to the AvantGo, Inc. Addendum                       Page 2
to Series D Preferred Stock Purchase Agreement

Amended and Restated Voting Agreement (the "Voting Agreement") and the Third
Amended and Restated Right of First Refusal and Co-Sale Agreement (the "Co-Sale
Agreement") (collectively, the "Transaction Documents") have been duly and
validly executed and delivered by you or on your behalf and constitute valid,
binding and enforceable obligations upon you; (B) that the representations and
warranties made in the Addendum by you are true and correct; (C) that any wire
transfers, drafts or checks tendered by you will be honored; (D) there are no
facts or circumstances relating to you that might prevent you from enforcing any
of the rights to which our opinion relates; and (E) that there are no extrinsic
agreements or understandings among the parties to the Transaction Documents that
would modify or interpret the terms of the Transaction Documents or the
respective rights or obligations of the parties thereunder.

          Our opinions in paragraphs 1 and 2 below are based solely upon our
review of certificates of public officials in the relevant states.

          In connection with the opinion expressed in paragraph 4 below, we have
examined the Certificate of Incorporation, as amended and restated, the Bylaws,
the stock record books and journals of the Company in our possession, the
Company's stock certificate books and the Company's minute books in our
possession. The Company has represented to us that these records are complete
and accurate and constitute all of the Company's documents with respect to the
issuance of shares of its capital stock, options, warrants or other rights to
purchase shares of its capital stock. We have relied on the Company's
representation to us that the information expressed in paragraph 4 below with
respect to the outstanding options, warrants or other rights is true and
complete. We have also relied on the Company's representations to us as to the
nature of the consideration received for such shares. Although we have no
knowledge that the information as to outstanding stock, options, warrants and
other rights provided by the Company and reflected in paragraph 4 is incorrect,
based on the examination referred to above, we are not in a position to verify
its accuracy or completeness, other than to say that our records are not
inconsistent with such information.

          With respect to our opinion in paragraph 6 below, the term "Material
Agreements" is limited to agreements specifically identified on the Schedule of
Exceptions. In connection with our opinion relating to the Material Agreements
set forth on the Schedule of Exceptions, we express no opinion on parol evidence
bearing on interpretation or construction of such agreements. Moreover, to the
extent that any of the Material Agreements is governed by the laws of any
jurisdiction other than the federal laws of the United States or the laws of the
State of California, our opinion relating to those agreements and instruments is
based solely upon the plain meaning of their language without regard to
interpretation or construction that might be indicated by the laws governing
those agreements or instruments. In connection with our opinion relating to
violations of federal or California laws, rules or regulations applicable to the
Company, such
<PAGE>

To the Additional Purchasers Listed on the                         April 7, 2000
Schedule of Investors to the AvantGo, Inc. Addendum                       Page 3
to Series D Preferred Stock Purchase Agreement

opinion is limited to such laws, rules or regulations that in our experience are
typically applicable to a transaction of the nature contemplated by the
Transaction Documents.

          As used in this opinion, the expression "we are not aware" or the
phrase "to our knowledge" means as to matters of fact that, based on the actual
knowledge of individual attorneys within the firm principally responsible for
handling current matters for the Company and after an examination of documents
referred to herein and after inquiries of certain officers of the Company, we
find no reason to believe that the opinions expressed are factually incorrect,
but beyond that we have made no factual investigation for the purposes of
rendering this opinion. Specifically, but without limitation, we have made no
inquiries of securities holders or employees (other than obtaining
representations from certain officers of the Company as described above) of the
Company.

          This opinion relates solely to the laws of the State of California,
the General Corporation Law of the State of Delaware and the federal law of the
United States, and we express no opinion with respect to the effect or
application of any other laws.

          Based upon our examination of and reliance upon the foregoing and
subject to the limitations, exceptions, qualifications and assumptions set forth
below and except as set forth in the Addendum or the Schedule of Exceptions
thereto, we are of the opinion that as of the date hereof

          1.  The Company is a corporation duly organized, validly existing and
in good standing under the laws of the State of Delaware, with the requisite
corporate power and authority to own its properties and to conduct its business
as presently conducted.

          2.  The Company is qualified to do business in the State of
California.

          3.  The Company has the requisite corporate power and authority to
execute, deliver and perform its obligations under the Transaction Documents.
The execution, delivery and performance of the Transaction Documents have been
duly authorized by all necessary corporate action of the Company, and the
Transaction Documents have been duly executed and delivered by the Company. Each
of the Transaction Documents constitutes a legally valid and binding obligation
of the Company, enforceable against the Company according to its terms;
provided, however, that no opinion is expressed with respect to the
enforceability of the Voting Agreement or the indemnity obligations of Section
1.10 of the Investors' Rights Agreement.

          4.  The authorized capitalization of the Company is as follows:

              (a)  Preferred Stock. 16,472,082 shares of Preferred Stock (the
                   ---------------
 "Preferred Stock"), (i) 4,434,156 of which shares have been designated Series A
 Preferred Stock,
<PAGE>

To the Additional Purchasers Listed on the                         April 7, 2000
Schedule of Investors to the AvantGo, Inc. Addendum                       Page 4
to Series D Preferred Stock Purchase Agreement

all of which are issued and outstanding; (ii) 3,301,886 of which shares have
been designated Series B Preferred Stock, all of which are issued and
outstanding; (iii) 3,736,040 of which shares have been designated Series C
Preferred Stock, all of which are issued and outstanding prior to the Closing,
and (iv) 5,000,OOO of which shares have been designated Series D Preferred
Stock, 3,289,495 of which are issued and outstanding immediately prior to the
Closing. The shares of Series A Preferred Stock, Series B Preferred Stock,
Series C Preferred Stock and Series D Preferred Stock have been duly authorized
and validly issued, and, to our knowledge, are fully paid and nonassessable.

              (b)  Common Stock. 40,000,OOO shares of Common Stock, 9,840,562
                   ------------
shares of which are issued and outstanding immediately prior to the Closing. All
of the outstanding shares of Common Stock have been duly authorized, fully paid
and are, to our knowledge, nonassessable and issued in compliance with all
applicable federal and state securities laws. The Company has reserved (i)
16,472,082 shares of Common Stock for issuance upon conversion of the Preferred
Stock and (ii) 9,213,600 shares of Common Stock for issuance to officers,
directors, employees and consultants of the Company under the Company's 1997
Stock Option Plan (the "1997 Plan"), of which (A) options to purchase 4,311,958
shares of Common stock are issued and outstanding, (B) options to purchase
3,278,562 shares of Common Stock have been exercised and are included in the
Company's outstanding Common Stock, (C) options to purchase 1,187,080 shares are
available for future issuance under the 1997 Plan and (D) 436,000 shares were
exercised and subsequently repurchased by the Company and are not available for
reissuance under the 1997 Plan.

              (C)  Except for (i) conversion privileges of the Preferred Stock,
(ii) outstanding options issued pursuant to the 1997 Plan, (iii) a Warrant to
purchase 117,558 shares of Series D Preferred Stock, (iv) a Warrant to purchase
117,558 shares of (A) the class of Preferred Stock issued in the Company's most
recent financing round prior to the date on which certain contractual
obligations of the Company occur (the "Trigger Date"); or (B) Common Stock if
the most recent financing round prior to the Trigger Date is the Company's
initial underwritten public offering pursuant to the Securities Act of 1933, as
amended (the "IPO"); (v) a Warrant to purchase 358,851 shares of Series D
Preferred Stock; (vi) certain rights held by each of (A) Ford Motor Company; (B)
The Goldman Sachs Group, Inc., Stonestreet Fund 2000, L.P., Bridge Street
Special Opportunity Fund 2000, L.P. and Goldman Sachs Investments Limited,
collectively; and (C) and Imagine Health, Inc. to purchase $5M, $3M and $3M of
shares of Common Stock, respectively, in a private financing to occur
contemporaneous with an IPO (if at all); (vii) the IPO participation right set
forth in Section 2.4 of the Investor Rights Agreement; and (viii) the rights of
first refusal set forth in the Investors Rights Agreement and Co-Sale Agreement,
there are, to our knowledge, no outstanding options, warrants, rights (including
conversion or preemptive rights and rights of first refusal or similar rights)
or agreements, orally or in writing, for the purchase or acquisition from the
Company of any shares of its capital stock.
<PAGE>

To the Additional Purchasers Listed on the                         April 7, 2000
Schedule of Investors to the AvantGo, Inc. Addendum                       Page 5
to Series D Preferred Stock Purchase Agreement

          5.  The shares of Series D Preferred Stock when issued in compliance
with the provisions of the Stock Purchase Agreement, will be duly authorized,
validly issued, nonassessable and fully paid. The Common Stock issuable upon
conversion of the Series D Preferred Stock has been duly and validly reserved
for issuance and, when and if issued upon such conversion in accordance with the
Company's Certificate of Incorporation, as amended and restated, will be validly
issued, fully paid and nonassessable. The issuance of the Series D Preferred
Stock and the Common Stock issuable upon conversion of the Series D Preferred
Stock is not subject to any preemptive rights set forth in the Company's
Certificate of Incorporation, as amended and restated, or, to our knowledge, or
any rights of first refusal or other similar rights created by the Company.

          6.  The execution, delivery and performance of the obligations of the
Company under the Transaction Documents, do not (i) violate any provision of any
federal, Delaware corporate or California law, rule or regulation applicable to
the Company, (ii) violate any provision of the Company's Certificate of
Incorporation, as amended and restated, or Bylaws, or (iii) conflict with or
constitute a material default under the provisions of judgments, writs, decrees
or orders, if any, specifically identified in the Schedule of Exceptions or the
material provisions of any Material Agreement.

          7.  The execution, delivery and performance of the obligations of the
Company under the Transaction Documents do not require any consents, approvals,
permits, orders or authorizations of, or any qualifications, registrations,
designations, declarations or filings with, any federal, Delaware corporate or
California state governmental authority on the part of the Company except (i) as
have been obtained and are effective, and (ii) the filing of certain notices
with the Securities and Exchange Commission, and the appropriate governmental
authorities in the states of New York, Michigan, California, Washington Texas
and Minnesota.

          8.  Based in part upon the representations made by you in the Stock
Purchase Agreement, the offer and sale of the Series D Preferred Stock to you
pursuant to the terms of the Stock Purchase Agreement are exempt from the
registration requirements of Section 5 of the Securities Act of 1933, as
amended, and from the qualification requirements of the California Corporate
Securities Law of 1968, as amended, and, under such securities laws as they
presently exist, the issuance of Common Stock to you upon conversion of the
Series D Preferred Stock would also be exempt from such registration and
qualification requirements.

          9.  To our knowledge, there is no action, suit, proceeding or
investigation pending against the Company before any court or governmental
agency, nor, to our knowledge, has the Company received any written threat
thereof that questions the validity of the Transaction Documents or the right of
the Company to enter into the Transaction Documents.
<PAGE>

To the Additional Purchasers Listed on the                         April 7, 2000
Schedule of Investors to the AvantGo, Inc. Addendum                       Page 6
to Series D Preferred Stock Purchase Agreement

          Our opinions expressed above are specifically subject to the following
limitations, exceptions, qualifications and assumptions:

              (A)  We express no opinion as to the effect of bankruptcy,
insolvency, reorganization, moratorium and other similar laws relating to or
affecting the relief of debtors or the rights and remedies of creditors
generally, including without limitation the effect of statutory or other law
regarding fraudulent conveyances and preferential transfers.

              (B)  We express no opinion as to the Company's compliance or
noncompliance with applicable federal or state antifraud or antitrust statutes,
laws, rules and regulations.

              (c)  Limitations imposed by state law, federal law or general
equitable principles upon the specific enforceability of any of the remedies,
covenants or other provisions of any applicable agreement and upon the
availability of injunctive relief or other equitable remedies, regardless of
whether enforcement of any such agreement is considered a proceeding in equity
or at law.

              (D)  The effect of court decisions, invoking statutes or
principles of equity, which have held that certain covenants and provisions of
agreements are unenforceable where enforcement of such covenants or provisions
under the circumstances would violate the enforcing party's implied covenant of
good faith and fair dealing.

              (E)  The effect of Section 1670.5 of the California Civil Code or
any other California law, federal law or equitable principle which provides that
a court may refuse to enforce, or may limit the application of, a contract or
any clause thereof which the court finds to have been unconscionable at the time
it was made or contrary to public policy.

              (F)  The unenforceability under certain circumstances of
provisions expressly or by implication waiving broadly or vaguely stated
rights, unknown future rights, or defenses to obligations or rights granted by
law, when such waivers are against public policy or prohibited by law.

              (G)  The unenforceability under certain circumstances of
provisions to the effect that rights or remedies are not exclusive, that rights
or remedies may be exercised without notice, that every right or remedy is
cumulative and may be exercised in addition to or with any other right or
remedy, that election of a particular remedy or remedies does not preclude
recourse to one or more remedies, or that failure to exercise or delay in
exercising rights or remedies will not operate as a waiver of any such right or
remedy.
<PAGE>

To the Additional Purchasers Listed on the                         April 7, 2000
Schedule of Investors to the AvantGo, Inc. Addendum                       Page 7
to Series D Preferred Stock Purchase Agreement

              (H)  Any provisions of the Transaction Documents requiring that
waivers must be in writing may not be binding or enforceable if a non-executory
oral agreement has been created modifying any such provision or an implied
agreement by trade practice or course of conduct has given rise to a waiver.

         This opinion is rendered as of the date first written above solely for
your benefit in connection with the Stock Purchase Agreement and may not be
delivered to, quoted or relied upon by any person other than you, or for any
other purpose, without our prior written consent. Our opinion is expressly
limited to the matters set forth above and we render no opinion, whether by
implication or otherwise, as to any other matters relating to the Company. We
assume no obligation to advise you of facts, circumstances, events or
developments which hereafter may be brought to our attention and which may
alter, affect or modify the opinions expressed herein.

                                         Very truly yours,

                                         /s/ Perkins Coie LLP

                                         PERKINS COIE LLP<PAGE>

                                                                   EXHIBIT 10.30

                               MASTER AGREEMENT
                               ----------------

     This Master Agreement ("Agreement") is entered into effective as of
February 16, 2000 (the "Effective Date") by and between AvantGo, Inc., a
                        --------------
Delaware corporation with an office at 1700 South Amphett Boulevard, Suite 300,
San Mateo, California, 94402 ("AvantGo"), and American Express Travel Related
Services Company, Inc., a New York corporation with an office at 3 World
Financial Center, New York, NY 10285 ("AMEX").

                                  Background
                                  ----------

AvantGo has developed certain technology and software which enables the delivery
and promotion of worldwide web content which is optimized for handheld devices.
Furthermore, AvantGo has developed certain technology and software for deploying
information to handheld devices in a corporate enterprise environment. AvantGo
also provides professional consulting services for developing and customizing
content and applications for handheld devices.

AMEX wishes to develop and promote AMEX Content (as defined in "Attachment A")
on the Internet and on its internal corporate network. AMEX also wants to use
AvantGo's professional consulting services to develop and deploy applications
for handheld devices. Further, AMEX wishes to make an equity investment in
AvantGo.

                                   Agreement
                                   ---------

1.   Financial Terms. As consideration for the associated rights and
     ---------------
obligations of the Content Agreement (attached hereto as "Attachment A"), the
parties agree to the following compensation schedule.

     1.1  AvantGo.com Network Access and Maintenance Fee. AMEX shall pay AvantGo
          ----------------------------------------------
$[******] for AvantGo.com Network Access and Maintenance service more fully
described in "Attachment A." Such fee shall be paid by April 15, 2000 and shall
cover the first 12 months of such AvantGo.com Network Access and Maintenance
services, such period to begin the date on which the AMEX Channel (as defined in
" Attachment A") becomes generally commercially available, but in no event later
than April 15, 2000.

     1.2  Promotion, Professional Services and Enterprise License Agreement
          ----------------------------------------------------------------
Expenses. During calendar year 2000, AMEX agrees to spend a combined minimum
--------
total of $[******] with AvantGo for (i) Promotions (as defined in the
"Promotions" section of "Attachment A"), (ii) professional services, as mutually
agreed upon by the parties, rendered by AvantGo on behalf of AMEX and (iii) an
Enterprise License Agreement to use the AvantGo Service for corporate use. AMEX
will be given a [****]% discount off of the Product Offerings rate sheet
attached as "Exhibit B to Attachment A" for Promotions placed with AvantGo.
Provided AvantGo is not in material breach of this Agreement, AMEX will pay,
upon receipt of an invoice from AvantGo, a minimum of 1/3 of the minimum total
agreed expenditives of $[*****]for promotions, professional services and
Enterprise License on or before each of the following dates: April 30, 2000,
August 31, 2000 and December 29, 2000. All invoices from AvantGo to AMEX shall
be accompanied by appropriate supporting documentation. For professional
services in excess of $[***] invoiced and provided by AvantGo to AMEX during
calender year 2000, AMEX will be given a [***]% discount off of AvantGo's
standard rates, such standard rate being $[***] per person per day.

2.   Professional Services. AMEX will purchase professional services from
     ---------------------
AvantGo pursuant to the terms of the Professional Services Agreement
("Attachment B").

3.   Trial Version of the Enterprise License. At no additional cost to AMEX,
     ---------------------------------------
AvantGo will provide AMEX with a trial version of AvantGo Enterprise Server for
corporate use during the term of this Agreement, consisting of a 100 seat
license for internal use by AMEX employees, only. The terms of the Enterprise
License Agreement shall be in accordance with AvantGo's standard Clickwrap
License attached hereto as "Attachment C".

4.   Equity Investment. AMEX agrees to make an equity investment in AvantGo of
     -----------------
up to $1.5 million for AvantGo Series D Preferred Shares, subject to completion
of (i) AMEX' due diligence to the satisfaction of AMEX and (ii) the execution by
the parties of an investment agreement under the terms of the Series D
financing, such terms to be satisfactory to AMEX.

5.   Attachments. The attachments referenced above are incorporated herein by
     -----------
reference. References herein to "Agreement" shall include the Agreement and its
Attachments, Exhibits and Schedules.

6.   Assignment. All the terms and provisions of this Agreement shall be binding
     ----------
upon and inure to the benefit of the parties to this Agreement and to their
respective heirs, successors, assigns and legal representatives. Neither party
may assign this Agreement in whole or in part without the other party's prior
written consent, such consent to not be unreasonably withheld. However, AMEX may
assign this Agreement to its parent, subsidiary or an affiliate without
AvantGo's prior written consent.

****** Certain information on this page has been omitted and filed separately
with the Securities and Exchange Commission. Confidential treatment has been
requested with respect to the omitted portions.
<PAGE>

7.   Governing Law. This Agreement shall be governed by and in accordance with
     -------------
the laws of the State of New York, without reference to its conflicts of laws
principles. The parties hereby consent to the exclusive jurisdiction of any
Federal or State court located within New York County, New York. The parties
hereby consent to the personal and exclusive jurisdiction and venue of these
courts.

8.   Severability. If any provision of this Agreement is held to be invalid
     ------------
under any applicable statute or rule of law, it shall be, to that extent, deemed
omitted, and shall not affect the remaining provisions and portions of this
Agreement.

9.   No Waiver. The waiver of any particular breach or default or any delay in
     ---------
exercising any rights shall not constitute a waiver of any subsequent breach or
default or effect any other right or remedy. Unless otherwise provided herein,
all rights and remedies hereunder are cumulative and are not exclusive of any
other rights or remedies provided hereunder or by law.

10.  Notices. All notices required or permitted hereunder shall be given in
     -------
writing addressed to the respective parties as set forth below and shall either
be (i) personally delivered, (ii) transmitted by postage prepaid certified mail,
return receipt requested, or (iii) transmitted by nationally-recognized private
express courier. The effective date of such Notice shall be deemed to be the
date upon which any such Notice is personally received by the addressee. Either
party may change its address for purposes hereof by written notice to the other
in accordance with the terms of this Section:

     If to AMEX:

          American Express Travel Related Services Company, Inc.
          3 World Financial Center
          New York, New York 10285
          Attn: Andrew Mantis
                Vice President

          With a copy to:

          American Express Travel Related Services Company, Inc.
          3 World Financial Center
          New York, New York 10285
          Attn: Frank Caesar
                Group Counsel

     If to AvantGo:

          AvantGo, Inc.
          1700 South Amphlett Boulevard, Suite 300
          San Mateo, California 94402
          Attn: General Counsel

11.  Force Majeure. Neither party will be responsible for any failure or delay
     -------------
in performance of its obligations under this Agreement due to circumstances
beyond its reasonable control, including, without limitation, acts of God, war,
riot, embargoes, sets of civil or military authorities, fire, floods, accidents,
service outages resulting from equipment and/or software failure and/or
telecommunications failures, power failures, network failures, failures of third
party service providers (including providers of Internet Services and
telecommunications). The party affect by any such event shall notify the other
party within a maximum period of fifteen (15) days from its occurrence. The
performance of this Agreement shall then be suspended for as long as any such
event shall prevent the affected party from performing its obligations under
this Agreement.

12.  Independent Contractors. Notwithstanding the use of the term "Partner" in
     -----------------------
this Agreement or in marketing materials, the relationship of AvantGo and the
AMEX is that of independent contractors, and nothing contained in this Agreement
shall be construed to (i) give either party the power to direct or control the
day-to-day activities of the other, (ii) constitute the parties as partners,
joint venturers, co-owners or otherwise as participant in a joint undertaking,
or (iii) give either party the authority to make commitments or enter into
contracts on behalf of, bind or otherwise obligate the other party in any manner
whatsoever except as expressly stated in this Agreement.

13.  Counterparts. This Agreement may be executed in counterparts, each of which
     ------------
shall be deemed an original and all of which together shall constitute one
instrument.

14.  Entire Agreement. This Agreement represents the entire agreement between
     ----------------
the parties, and supersedes all prior agreements and understandings with respect
to the matters covered by this Agreement. The parties agree that they have not
entered into this Agreement based on any representations other than those
contained herein. Notwithstanding the foregoing, it is

<PAGE>

hereby understood and agreed that the provisions of the Confidentiality
Agreement executed by AvantGo and AMEX, dated as of October 13, 1999 shall
remain in force except to the extent that the terms and conditions of this
Agreement shall impose stricter requirements or standards, in which case the
stricter terms and conditions of this Agreement shall control with respect to
confidentiality. This Agreement may only be amended by a written agreement
signed by both parties.

IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be signed
by duly authorized officers or representatives as of the date first above
written.

American Express Travel Related           AvantGo, Inc.
Services Company Inc.
/s/ Andrew Mantis                         /s/ Richard Owen
------------------------------            --------------------------------------
Signature                                 Signature

Andrew Mantis                             Richard Owen
------------------------------            --------------------------------------
Name (Print or Type)                      Name (Print or Type)

VP                                        CEO
------------------------------            --------------------------------------
Title                                     Title

2/17/00                                   2/16/00
------------------------------            --------------------------------------
Date                                      Date

<PAGE>

                                 ATTACHMENT A
                                 ------------

                                AMEX AGREEMENT

     This AMEX Agreement ("Content Agreement") with an effective date of
February 16, 2000 ("Effective Date") is entered into between AvantGo, Inc
("AvantGo"), and American Express ("AMEX").

1.   Definitions.
     -----------

"AMEX Channel" means a web page on the AMEX WWW Site that is delivered via the
 ------------
Service to an End User's Handheld Device when the Handheld Device is connected
wirelessly, connected through synchronization with such End User's desktop
computer or through any other means.

"AMEX Content" means those portions of the trademarks, service marks, other
 ------------
indicia of origin, domain names, URL, copyrighted material and art work owned or
licensed by AMEX and any additional information which is developed by or on
behalf of AMEX for delivery through the AMEX Channel.

"AMEX WWW Site" means WWW site operated by or on behalf of AMEX or an AMEX
 -------------
affiliate, which may have links to mirror sites, or contain co-branded sites and
successor sites to the foregoing.

"AvantGo Style Guide" means the AvantGo guide which specifies guidelines and
 -------------------
procedures for developing WWW content which is optimized for the small graphics
display of Handheld Devices, a copy of which is located at
http://corp.avantgo.com/DevCorner/StyleGuide/ and is incorporated herein by
---------------------------------------------
reference.

"AvantGo WWW Site" means the WWW site operated by AvantGo at
 ----------------
http://avantgo.com/channels/ and any successor site thereto.

"AMEX End Users" means any party that uses a Handheld Device to access the
 --------------
AMEX Content.

"Confidential Information" of a party means any information, including
 ------------------------
information about technologies, business strategies, distribution activities,
product features, methodologies, demographics, and usage patterns, disclosed by
that party to the other party pursuant to this Content Agreement, subject to the
exceptions in Section 6.2 below."

"Download AvantGo Icon" means the link on the AMEX WWW Site to the AvantGo WWW
 ---------------------
Site where users of such site may successfully download AvantGo software for use
in connection with AvantGo Service.

"End User" means any party that uses a Handheld Device and accesses the Service.
 --------

"Handheld Device" means any device that is able to receive or store information
 ---------------
including, but not limited to, Palm OS devices. Windows CE devices, cell phones,
pagers, smartphones and other devices, whether wireless, wireline or requiring
cradle synchronization.

"Licensed Materials" means the AvantGo trademarks and Icons (as defined in
 ------------------
Section 2.2(ii) below).

"Promotion" shall have the meaning ascribed to it in Section 3.3 herein.
 ---------

"Service" means the service provided by AvantGo to users of Handheld Devices
 -------
facilitating the delivery of content to users.

"Subscribe to Channel" means a web page on the AMEX WWW Site where users of that
 --------------------
page can subscribe to the Service.

"URL" means Universal Resource Locator.
 ---

"WWW" means the part of the Internet commonly known as the World Wide Web.
 ---

2.   License Grants.
     --------------

     2.1. Content License. Subject to the terms and conditions of this Content
          ---------------
Agreement, AMEX hereby grants AvantGo a nonexclusive, non-transferable,
revocable, worldwide license to use, copy (including, without limitation,
caching for performance purposes), perform, display and redistribute the AMEX
Content solely for purposes of providing the Service and AMEX Content to an
unlimited number of End Users. AvantGo may, with prior written consent from
AMEX, display the AMEX Channels through the Service under the brand of a third
party or co-branded with such third party.
<PAGE>

     2.2  Trademark License.
          -----------------

          (i)  By AMEX. Subject to the terms and conditions of this Content
               -------
Agreement, AMEX hereby grants AvantGo a nonexclusive, non-transferable,
revocable, worldwide license to use AMEX's trademarks, trade names and logos set
forth on Exhibit A (the "AMEX Trademarks") solely in connection with the display
         ---------
of AMEX Channels through the Service and the marketing of the AMEX Content and
AMEX Channels. Notwithstanding any other provision of this Content Agreement to
the contrary, AvantGo shall not have the right to use AMEX Trademarks or to
refer to AMEX directly or indirectly, in connection with any product, promotion
or publication without the prior written approval of AMEX. Any prior consent of
use or reference may be revoked by AMEX at any time with immediate effect.
AvantGo shall comply with any usage guidelines which may be provided to AvantGo
by AMEX from time to time. AvantGo shall not challenge AMEX's ownership of AMEX
Trademarks or use or adopt any trademarks which might be confusingly similar to
such AMEX Trademarks.

          (ii) By AvantGo. Subject to the terms and conditions of this Content
               ----------
Agreement, AvantGo hereby grants to AMEX a nonexclusive, non-transferable,
revocable, worldwide license to (i) display the "Download AvantGo" icon on the
AMEX WWW Site for the purpose of linking AMEX WWW Site users to that portion of
the AvantGo WWW Site where such users may download AvantGo software for use in
connection with the Service and (ii) display the "Subscribe to Channel" icon on
the AMEX WWW Site to enable End Users to subscribe to the AMEX WWW Site as an
AMEX Channel (collectively the "AvantGo Icons"). AMEX shall comply with any
                                -------------
usage guidelines which may be provided to AMEX by AvantGo from time to time, and
upon request by AvantGo, shall furnish AvantGo with samples of AMEX's usage of
such AvantGo Icons. Notwithstanding any other provision of this Content
Agreement to the contrary, AMEX shall not have the right to use AvantGo Icons or
to refer to AvantGo directly or indirectly, in connection with any product,
promotion or publication without the prior written approval of AvantGo. Any
prior consent of use or reference may be revoked by AvantGo at any time with
immediate effect. AMEX shall not challenge AvantGo's ownership of such AvantGo
Icons or use or adopt any trademarks which might be confusingly similar to such
AvantGo Icons.

     2.3  Restrictions. Neither party shall have the right to sublicense any of
          ------------
the rights granted to such party in this Section 2; provided, however, that AMEX
End Users shall have the right to copy and use the AMEX Content on such AMEX End
User's Handheld Device solely for personal use. AMEX shall not rent, lease,
reproduce, modify, translate, or create derivative works of the Licensed
Materials. AvantGo reserves all rights in the Licensed Materials which are not
expressly granted to AMEX in this Content Agreement.

     2.4. Proprietary Notices. The parties agree they will not remove any
          -------------------
copyright or other proprietary rights notices from the other party's trademarks
or the Licensed Materials.

     2.5  AMEX shall be allowed to deliver an unlimited amount of AMEX Content
via the AMEX Channel to an unlimited number of users during the period in which
AMEX has paid the AvantGo.com Network Access and Maintenance Fee identified in
the Agreement.

3    Obligations of AMEX.
     -------------------

     3.1  Contacts. AMEX shall designate one person who shall be the exclusive
          --------
point of contact with AvantGo with respect to all technical issues hereunder
("Technical Contact"), and one person who shall be the exclusive point of
  -----------------
contact with AvantGo with respect to all marketing issues hereunder ("Marketing
                                                                      ---------
Contact"). The Technical Contact and Marketing Contact are set forth on Exhibit
-------                                                                 -------
A. AMEX will have the right to change the Technical Contact or the Marketing
-
Contact upon prior notice to AvantGo.

     3.2  Content Development and Change. AMEX shall use its commercially
          ------------------------------
reasonable efforts to develop and make AMEX Content available to End Users. AMEX
will ensure that the URL links developed for the Service to access the AMEX
Content are only accessible via the AvantGo browser and by no other third party
browser. The procedure for ensuring compliance with this requirement is
described in the Style Guide. AMEX shall provide AvantGo with reasonable advance
notice of any changes in the AMEX Content. AMEX will be solely responsible for
developing and formatting the AMEX Content.

     3.3  Promotions.  AMEX shall promote the AMEX Channel and the Service
          ----------
through various promotional programs and channels as the parties shall mutually
agree ("Promotions"). All marketing and other promotional materials (including
without limitation, solicitation, fulfillment, customer service and retention
materials) developed hereunder in connection with any Promotion shall be
referred to as "Promotional Material." In the event of a disagreement, AMEX
shall have the final controlling rights on all marketing and promotion of the
AMEX Content or AMEX Channels (including but not limited to presentation, copy,
format, design, script development (etc.) so long as such marketing and
promotion do not violate any contracts, laws or regulations. The timing and
scope (i.e. size and frequency) of all Promotions will be mutually approved by
both parties, which approval shall not unreasonably be withheld. AMEX may, at
its option, promote the AMEX Channel or Service through one or more Programs
described in Exhibit B to "Attachment A" herein.
<PAGE>

     3.4.    Press Release: AMEX shall issue a press release, mutually agreeable
             -------------
to the parties, within 30 days following the date on which AMEX Channels are
generally made available commercially.

     3.5.    AMEX Warranties: AMEX represents and warrants to AvantGo that (i)
             ---------------
the AMEX Content shall not contain libelous, defamatory obscene, pornographic or
profane material or any instructions that may cause harm to any individuals;
(ii) the AMEX Content may be reproduced, used, converted into digital or other
electronic media, displayed, and distributed as contemplated by this Content
Agreement without violating or infringing the rights of any other person or
entity, including, without limitation, infringing any copyright, trademark or
right of privacy, or any other intellectual or industrial property right, title
or interest of any party, and without obligating AMEX to pay any fees to third
parties; (iii) it will obtain all rights, permissions and approvals from any
third party (including but not limited to electronic reproduction rights
necessary for use of the AMEX Content in connection with the AMEX Channel); and
(iv) the AMEX Content provided to AvantGo is accurate to the best of AMEX's
knowledge and may be relied upon as such by any third party; and (v) it will pay
or cause to be paid royalties, fees or other compensation due to third parties
in connection with the exploitation of the AMEX Content in the manner
contemplated by this Content Agreement. EXCEPT AS SET FORTH IN THIS CONTENT
AGREEMENT, AMEX MAKES NO REPRESENTATIONS OR WARRANTIES, EXPRESSED OR IMPLIED,
INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR
PURPOSE.

4.   Obligations of AvantGo.
     ----------------------

     4.1     Joint Marketing. AMEX and AvantGo will use commercially reasonable
             ---------------
efforts to participate in Promotions with respect to the promotion of the AMEX
Channel and the Service.

     4.2.    User Reporting. At AMEX's request, at each calendar month-end,
             --------------
AvantGo will provide AMEX with the total number of unique End Users who have
subscribed to AMEX Channel, Upon mutual agreement of the parties, AvantGo shall
provide AMEX with such other reports and at such times and in such formats as
AMEX may reasonably request from time to time.

     4.3     Linking. AvantGo will enable End Users to subscribe to the AMEX
             -------
Channel from the AvantGo WWW Site. AvantGo will have no obligation to list, and
will have the right to remove from such list, in AvantGo's sole discretion, AMEX
Channels that do not conform to the AvantGo Style Guide; provided, however, that
prior to such removal, AvantGo will notify AMEX in writing, and AMEX will have
thirty (30) days to conform the AMEX Channel to the AvantGo Style Guide. AvantGo
may restrict or prevent access to the AMEX Content, the AMEX WWW Site and/or the
AMEX Channel (and, at AvantGo's option, immediately terminate this Content
Agreement), if any portion thereof (i) involves the transmission of "junk mail",
"spam", "chain letters", or unsolicited mass distribution of email; (ii)
distributes or allows access to corporate or Intranet information that is not
generally made available for free to users of the WWW, unless access to such
information is available to subscribers to or enrollees in a service provided by
AMEX; or (iii) is otherwise inappropriate for inclusion in the Service in the
reasonable judgement of AvantGo.

     4.4.    Technical Support. AvantGo will provide the following technical
             -----------------
support to AMEX: electronic mail support to the Technical Contact with respect
to the development of AMEX Content during normal business hours within twenty-
four hours of such request.

     4.5     Audit by AMEX. AMEX shall have the right, during normal business
             -------------
hours and upon reasonable notice to visit AvantGo's premises and operation
center for the purpose of evaluating AvantGo's performance of its obligations
under this Agreement. Furthermore, AMEX shall have the right to perform data
security review of AvantGo's security controls as they relate to the physical
security and protection of AMEX Confidential data/system access.

     4.6     Channel Inaccessibility. From the time that AvantGo becomes aware
             -----------------------
that AMEX End Users are not able to access the AMEX Channel, AvantGo will use
reasonable efforts to notify AMEX of such condition within 1 hour. Furthermore,
to the extent the problem is caused by a failure with the Service, AvantGo will
undertake reasonable efforts to promptly restore the Service to full operation.

5    Ownership:
     ----------

     5.1.    By AMEX.
             -------

     5.1.1.  AMEX shall have all rights and interest to personally identifiable
information provided by AMEX End Users (including without limitation such
information of Cardmembers and AMEX customers) during such user's use of or
access to the AMEX Content or the AMEX Channel or resulting from such user's use
of or access to the AMEX Content or the AMEX Channel ("AMEX User Data").
("Cardmembers" means a holder of a charge, credit, debit, bank, stored value,
procurement travel or smart card issued by AMEX, its affiliates or its
licensees). AvantGo (i) shall not solicit AMEX End
<PAGE>

Users (including without limitation AMEX customers or Cardmembers) based upon
their status as an AMEX End User or otherwise based upon their status as an
AMEX customer or Cardmember. Notwithstanding the foregoing, nothing in this
Content Agreement shall prevent AvantGo from using any and all data and
information provided by users during such user's use of or access to those
portions of the Service unrelated to the AMEX Channel or the AMEX Content, and
AvantGo may market product and services to its own customers and potential
customers provided that (A) in any such marketing, such customer is not
identified in any manner as an AMEX Customer or Cardmember and (B) the source
of the information used by AvantGo to target such customer or potential customer
is not the AMEX User Data. Nothing in this Content Agreement shall grant to any
other pay any right, title or interest therein, except the license granted to
AvantGo to use, or authorize others to use the AMEX Content in connection with
the AMEX Channel, and in accordance with the terms of this Content Agreement.

     5.1.2.   AvantGo acknowledges that AMEX shall be the sole and exclusive
owner of the AMEX Content and the AMEX WWW Site, including, but not limited to,
all associated trademarks and copyrights thereto. Except as expressly provided
herein, nothing in this Content Agreement shall confer in AvantGo any right of
ownership in, or license to, the AMEX Content or AMEX WWW Site, nor other
intellectual property rights pertaining thereto. AvantGo shall not challenge
AMEX's ownership of such trademarks or related intellectual property rights.
AvantGo shall keep the AMEX Content and the AMEX Trademarks free and clear of
all claims, liens and encumbrances.

     5.2.    By AvantGo. AvantGo shall own all right, title and interest in and
             ----------
to the Licensed Materials, and all intellectual property rights pertaining
thereto. Except as expressly provided herein, nothing in this Content Agreement
shall confer in AMEX any right of ownership in, or license to, the Licensed
Materials nor other intellectual property rights pertaining thereto. AMEX shall
not challenge AdvantGo's ownership of such Licensed Materials or related
intellectual property rights AMEX shall keep the Licensed Materials free and
clear of all claims, liens and encumbrances.

     5.3.    Survival. The terms of Section 5 shall survive the termination or
             --------
expiration of this Content Agreement.

6.   Proprietary Rights and Confidential Information.
     -----------------------------------------------

     6.1     Nondisclosure. Each party shall treat as confidential all
             -------------
Confidential Information of the other party, shall not use such Confidential
Information except as set forth herein, and shall use reasonable efforts not to
disclose such Confidential Information to any third party. Without limiting the
foregoing, each of the parties shall use at least the same degree of care which
it uses to prevent the disclosure of its own confidential information of like
importance to prevent the disclosure of Confidential Information disclosed to
it by the other party under this Content Agreement. Each party shall promptly
notify the other party of any actual or suspected misuse or unauthorized
disclosure of the other party's Confidential Information.

     6.2.    Exceptions. Notwithstanding the above, neither party shall have
             ----------
liability to the other with regard to any Confidential Information of the other
which the receiving party can prove: (a) was in the public domain at the time it
was disclosed or has entered the public domain through no fault of the receiving
party; (b) was known to the receiving party, without restriction, at the time of
disclosure; (c) is disclosed with the prior written approval of the disclosing
party; (d) was independently developed by the receiving party without any use of
the Confidential Information; (e) became known to the receiving party, without
restriction, from a source other than the disclosing party, without breach of
this Content Agreement by the receiving party and otherwise not in violation of
the disclosing party's rights; (f) is disclosed generally to third parties by
the disclosing party without restrictions similar to those contained in this
Content Agreement; or (g) is disclosed pursuant to the order or requirement of a
court, administrative agency, or other governmental body; provided, however,
that the receiving party shall provide prompt notice thereof to the disclosing
party to enable the disclosing party to seek a protective order or otherwise
prevent or restrict such disclosure.

     6.3.    Return of Confidential Information. Upon expiration or termination
             ----------------------------------
of this Content Agreement, each party shall return all Confidential Information
received from the other party within 30 days of receipt of a request requesting
the return of such Confidential Information.

     6.4.    Remedies. Any breach of the provisions in this Section 6 is a
             --------
breach of this Content Agreement which may cause irreparable harm to the non-
breaching party. Any such breach shall entitle the non-breaching party to
injunctive relief in addition to all legal remedies.

     6.5.    Survival. The terms of Section 6 shall survive the termination or
             --------
expiration of this Content Agreement.

7.   Representations and Warranties: The parties represent and warrant that:
     ------------------------------

     7.1     each has the full corporate right, power and authority to enter
into this Content Agreement and to perform the acts required of it hereunder;
<PAGE>

10.    Term and Termination.
       --------------------

       10.1.   Term. Unless earlier terminated in accordance with the terms
               ----
hereof, the term of this Content Agreement and the licenses granted hereunder
shall commence on the Effective Date and shall have an initial term of one year
and, thereafter, shall continue for additional successive one (1) year renewal
periods unless and until either party provides the other party written notice of
its intention to terminate at least thirty (30) days prior to the expiration of
initial term or the then-current renewal period.

10.2.  Early Termination.
       -----------------

       10.2.1  Either Party shall have the right to terminate this Content
Agreement (i) in the event the other party is in default of one or more material
obligations under this Content Agreement and has not cured the default within
thirty (30) days of receipt of written notice from the non-breaching party or
such longer period as expressly provided herein; or (ii) with immediate effect:
(a) upon the institution by the other party of proceedings to be adjudicated a
bankrupt, insolvent or the consent by the other party to institution of
bankruptcy or insolvency proceedings against it or the filing by the other party
of a petition or answer or consent seeking reorganization or release under the
Federal Bankruptcy Code, or any other applicable Federal or state law, or the
consent by the other party to the filing of any such petition or the appointment
of a receiver, liquidator, assignee, trustee, or similar official of the other
party or of any substantial part of its property, or the making by the other
party of an assignment for the benefit of creditors, or the admission in writing
by the other party of an assignment for the benefit of creditors, or the
admission in writing by the other party of its inability to pay its debts
generally as they become due or the taking of corporate action by the other
party in furtherance of any such actions; (b) if, within 60 days after the
commencement of an action against the other party seeking any bankruptcy,
insolvency, reorganization, liquidation, dissolution or similar relief under any
present or future law or regulation, such action shall not have been dismissed
or all orders or proceedings thereunder affecting the operations or the business
of the other party stayed, or if the stay of any such order or proceeding shall
thereafter be set aside; or if, within 60 days after the appointment without the
consent or acquiescence of the other party of any trustee, receiver or
liquidator or similar official of the other party, or of all or any substantial
part of the property of the other party, such appointment shall not have been
vacated.

       10.2.2  In the event (a) of a sale or distribution of all of
substantially all of the assets of AvantGo or a sale or distribution of
sufficient stock (other than pursuant to a public offering) of AvantGo to effect
a change in control or (b) that AvantGo or its affiliate enters into the
business of providing financial services or provides financial product or
service substantially similar to any of the AMEX' financial products or
services, AMEX may, in its sole discretion, terminate this Content Agreement
immediately. In the event that AMEX terminates this Content Agreement pursuant
to the preceding sentence of this Section, AvantGo shall reimburse AMEX for
reasonable out-of-pocket expenses incurred in transferring the AMEX Channel to
another vendor of AMEX or to AMEX itself. With AMEX's approval, which shall not
be unreasonably withheld, AvantGo may negotiate transfer expenses on behalf of
AMEX with another vendor to ensure the reasonableness of the expenses. With
AMEX' approval, AvantGo may provide components of the transfer.
<PAGE>

                          EXHIBIT A (to ATTACHMENT A)

1.   AMEX Trademarks.
     ---------------

2.   Technical Contact (please include email, phone, fax and mailing address).
     ------------------------------------------------------------------------

3.   Marketing Contact. (please include email, phone, fax and mailing address).
     -------------------------------------------------------------------------

4.   Description of Channel(s)
     ----------------------

5.   AMEX WWW Site.
     -------------
<PAGE>

                         EXHIBIT B (TO ATTACHEMENT A)

                         AvantGo.com Product Offerings
                         -----------------------------

Web Site Products:
-----------------
Featured Placement
Category Featured Placement
Site Sponsorship

On Device Products:
------------------
Device Home Page Sponsorship
AvantGo Central Sponsorship
AvantGo New User Guide Sponsorship
<PAGE>

                              Featured Placement
                              ------------------
                                  Description
                                  -----------

Featured placement offers Channel Partners the opportunity to appear in the
Featured category page found under the "Featured" link from the
http://avantgo.com/channels page for a specified period. The Featured category
page is intended as a fast way for users to find many high-quality, high-value
channels in one place. The effectiveness of this mechanism is reflected by the
fact that the Top 10 list of channels consists primarily of channels that appear
in the Featured section.

                                    Caveats
                                    -------

We do not guarantee any particular ordering of channels, number of partners or
appearance of the page in the Featured section. We reserve the right to change
the appearance of the Featured page at will. Featured channels rotate in order
onto the channel page's logo slot at [******] intervals at a minimum. We do
not guarantee any particular number of page views.

<TABLE>
<CAPTION>
                                    Pricing
                                    -------
--------------------------------------------------------------------------------
                       1Q00           2Q00           3Q00           4Q00
--------------------------------------------------------------------------------
<S>                    <C>            <C>            <C>            <C>
Per Quarter              $******       $******         $*******       $******
--------------------------------------------------------------------------------
</TABLE>

                            [WEB PAGE APPEARS HERE]

[*]= CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY
WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT TO
THE OMITTED PORTIONS.
<PAGE>

                          Category Featured Placement
                          ---------------------------
                                  Description
                                  -----------

Channel Feature placement offers Channel Partners an opportunity to appear, with
their logo and description, at the top of a channel category page. This will be
the only channel that appears with a logo within the category selected. For
example, Soap City may feel that they're not receiving adequate attention By
purchasing the Category Feature, they could be highlighted at the top of the
Entertainment category page.

                                    Caveats
                                    -------

As there is only one slot on each category page, Category Feature placement is
limited by availability. In addition, a partner who wishes to purchase a
Category Feature for a given category must already exist in that category. For
example, an entertainment channel could not appear at the top of the Business
page.

<TABLE>
<CAPTION>
                                    Pricing
                                    -------
--------------------------------------------------------------------------------
                           1Q00          2Q00         3Q00          4Q00
--------------------------------------------------------------------------------
<S>                        <C>           <C>          <C>           <C>
Per Quarter                  $******       $******      $*******      $*******
--------------------------------------------------------------------------------
</TABLE>

                            [WEB PAGE APPEARS HERE]

[*]= CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY
WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT TO
THE OMITTED PORTIONS.
<PAGE>

                             Default Installation
                             --------------------
                                  Description
                                  -----------

Default installation ensures that a partner's channel is automatically installed
during a user's sign up process when the user selects a particular category of
interest on http://avantgo.com/setup/new_account.html.

For example. CNet may wish to have their channel installed by default on as many
users' accounts as possible. We might suggest that they select the "SciTech"
category. Users selecting the "SciTech" category, as their interest would
receive the CNet channel during their first sync.

                                    Caveats
                                    -------

The default installation is not an exclusive arrangement, i.e. other channels
will be installed along with the Channel Partner's channel, and channel
installation is not guaranteed when a user signs up from another partner's site.

<TABLE>
<CAPTION>
                                    Pricing
                                    -------
--------------------------------------------------------------------------------
                       1Q00          2Q00          3Q00          4Q00
--------------------------------------------------------------------------------
<S>                    <C>           <C>           <C>           <C>
Per Quarter              $*******      $*******      $*******      $*********
--------------------------------------------------------------------------------
</TABLE>

                            [WEB PAGE APPEARS HERE]

-----------------
User selects
interests and
receives default
channels
-----------------

[*]= CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY
WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT TO
THE OMITTED PORTIONS.
<PAGE>

                                 Custom Setup
                                 ------------
                                  Description
                                  -----------

Many of our channel partners desire a custom install process that extends their
branding through the set up procedure. These partners greatly value the ability
to have AvantGo.com appear as a feature of their site rather than as a loosely
associated partner.

Channel partners can customize the following items in the setup process;

 .  Channel partner logo that appears on each page. The AvantGo.com logo will
   also appear on each page. The partner logo will appear in the upper-left
   comer of the screen.
 .  The right to veto placement of another default channel which also gets
   installed as part of the custom setup process, on the basis of competition.
 .  The link users are directed to at the end of the install process. This will
   allow Channel Partners to give users a way to end up back on a page on their
   site. At the end of the install process, there will also be an option for
   users to go on to AvantGo.com to get more channels.

Once the custom setup pages are created on AvantGo.com, the Channel Partner can
create a link from a page on their site to AvantGo's site for their users to
initiate the installation and sign up process.

                                   Caveats
                                   -------
The above are the only items Channel Partners may customize.

                                    Pricing
                                    -------
$*** per quarter.

                            [WEB PAGE APPEARS HERE]

[*]= CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY
WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT TO
THE OMITTED PORTIONS.
<PAGE>

                           AvantGo Site Sponsorship
                           ------------------------

                                  Description
                                  -----------
Opportunities are available to place a branded sponsorship pixels on various
areas of the sire, including the registration process and channels page (70 X 65
pixels).

                                                                     Pricing
-------------------------------------------------------------------------------
                    1Q00           2Q00           3Q00           4Q00
-------------------------------------------------------------------------------
Per Quarter            $******        $*******       $*******       $*******
-------------------------------------------------------------------------------

                              ------------------
                                 Channels Page
                              ------------------

                            [WEB PAGE APPEARS HERE]

[*]= CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY
WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT TO
THE OMITTED PORTIONS.
<PAGE>

                     AvantGo Device Home Page Sponsorship
                     ------------------------------------
                                  Description
                                  -----------

Sponsorship offers Channel Partners or Third Parties the best opportunity to
interact on a regular basis with the entire AvantGo palm-sized computing user
base. Sponsorship offers a unique opportunity to place a brand in front of an
extremely valuable audience as well as to engage them in an interactive
experience, which could include surveys, collecting valuable information such as
an email address or mailing address, playing a game, taking a quiz or placing an
order. The promotion will consist of a text and/or logo link (12 X 160 pixels)
from the Device Home Page/Channel Listing to additional promotional content.
This sponsorship will be viewed each time the user goes to their Channels
Listing Home Page. Palm-device owners tend to have a close and passionate
relationship with their handheld computers. Sponsorship provides a rare and
invaluable opportunity to place a targeted message right in the palm of their
highly qualified hands. Advertisers will have sole sponsorship during the course
of their run.

                                    Caveats
                                    -------
We do not guarantee any specific number of page views. Rates are based on a
minimum of ******* synced users and ******* syncs a day (********* per month).

                                    Pricing
                                    -------
--------------------------------------------------------------------------------
                         1Q00           2Q00           3Q00           4Q00
--------------------------------------------------------------------------------
Per week                    $******       $*******       $*******       $*******
--------------------------------------------------------------------------------
Per Month                  $*******       $*******     $*********     $*********
--------------------------------------------------------------------------------
Per Quarter              $*********     $*********     $*********     $*********
--------------------------------------------------------------------------------

                            [WEB PAGE APPEARS HERE]

[*]=CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY
WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT TO
THE OMITTED PORTIONS.
<PAGE>

                          AvantGo Central Sponsorship
                          ---------------------------
                                  Description
                                  -----------
Sponsorship offers Channel Partners or Third Parties an opportunity to interact
on a regular basis with the entire AvantGo palm-sized computing user base.
Sponsorship offers a unique opportunity to place a brand in front of an
extremely valuable audience as well as to engage them in an interactive
experience, which could include surveys, collecting valuable information such as
an email address or mailing address, playing a game, taking a quiz or placing an
order. The promotion will consist of a text and/or logo link (12 X 160 pixels)
from AvantGo Central to additional promotional content. Palm-device owners tend
to have a close and passionate relationship with their handheld computers.
Sponsorship provides a rare and invaluable opportunity to place a targeted
message right in the palm of their highly qualified hands. Advertisers will have
sole sponsorship during the course of their run.

                                   Caveats
                                   -------
We do not guarantee any specific number of page views. Rates are based on a
minimum of ******* total synced users and ****** syncs a day (********* syncs a
month).

--------------------------------------------------------------------------------
                         1Q00           2Q00           3Q00           4Q00
--------------------------------------------------------------------------------
Per week                    $******        $******        $******        $******
--------------------------------------------------------------------------------
Per Month                   $******       $*******       $********      $*******
--------------------------------------------------------------------------------

                            [WEB PAGE APPEARS HERE]

Per Quarter                $*******       $*******       $*******       $*******
--------------------------------------------------------------------------------

                            [WEB PAGE APPEARS HERE]

[*]=CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY
WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT TO
THE OMITTED PORTIONS.
<PAGE>

                      AvantGo New User Guide Sponsorship
                      ----------------------------------
                                  Description
                                  -----------
Sponsorship offers Channel Partners or Third Parties the only opportunity to
interact on a regular basis with new AvantGo users while they are in the
exploratory phase. The New User Guide will contain general information about the
AvantGo service, user tips, help section, etc. Sponsorship offers a unique
opportunity to place a brand in front of an extremely valuable audience as well
as to engage them in an interactive experience, which could include surveying,
collecting valuable information such as an email address or mailing address,
playing a branded game, taking a quiz or placing an order. The promotion will
consist of a text and/or logo link (12 X 160 pixels) from the New User Guide to
additional promotional content. Palm-device owners tend to have a close and
passionate relationship with their handheld computers. Sponsorship provides a
rare and invaluable opportunity to place a targeted message right in the palm of
their highly qualified hands. Advertisers are guaranteed sole sponsorship during
the course of their run.

                                    Caveats
                                    -------
We do not guarantee any specific number of page views. Rates are based on an
average minimum of 10,000 new users per week. However, it is expected that new
users will interact with the New User Guide frequently during the early stages
of their membership.

                                    Pricing
                                    -------
------------------------------------------------------------------------------
                       1Q00           2Q00           3Q00             4Q00
------------------------------------------------------------------------------
Per Week             $ ******       $ ******       $*******         $*******
------------------------------------------------------------------------------
Per Month            $ ******       $ ******       $*******         $*******
------------------------------------------------------------------------------
Per Quarter          $*******       $*******       $*******         $*******
------------------------------------------------------------------------------

                            [WEBPAGE APPEARS HERE]

[*]= CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY
WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT TO
THE OMITTED PORTIONS.
<PAGE>

                                 ATTACHMENT B
                                 ------------

                        PROFESSIONAL SERVICES AGREEMENT

     THIS PROFESSIONAL SERVICES AGREEMENT ("PSA") with an effective date of
February 16, 2000 ("Effective Date"), is entered into between AvantGo, Inc
("AvantGo"), and American Express ("Client").

1.   PROJECTS; STATEMENTS OF WORK

     a.   Services will be provided to Client upon written request by Client for
such services, as the parties may agree upon from time to time in a Statement of
Work (as defined below) (the "Services") in accordance with Schedule A hereto.

     b.   Each project to be performed by AvantGo will be described in a
statement of work ("Statement of Work") that must be signed by both parties to
be effective. Each Statement of Work will be subject to the terms of this PSA.
In the event of any conflict or inconsistency between the terms of this PSA and
any Statement of Work, the terms of the Statement of Work will prevail.

     c.   Each Statement of Work will include: (i) the start date and estimated
duration of the project; (ii) a description of the project and the Services to
be performed by AvantGo; (iii) the daily rates or project rate for the project;
and (iv) such other information as may be agreed to by the parties as well as
those items identified in Schedule B hereto.

     d.   Client may, at any time, by written notice to AvantGo, request changes
to a Statement of Work. AvantGo will provide Client with an estimate of the
impact, if any, of such requested change on the payment terms, completion
schedule and any other applicable provision of the Statement of Work. If the
parties mutually agree to such changes, upon the request of Client, a written
description of the agreed change (a "Change Authorization") will be prepared
which both parties must sign. In the event of any conflicts or inconsistency,
the terms of a Change Authorization prevail over those of the Statement of Work.

2.   PAYMENT FOR SERVICES AND REIMBURSABLE EXPENSES

     Client shall pay AvantGo as specified in the applicable Statement of Work.
In addition to the rates described in the applicable Statement of Work, Client
shall reimburse AvantGo for:

     a.   In the event that any travel is required in connection with any
Services, Client agrees to pay all costs reasonably incurred by AvantGo's
personnel in connection with such Services (including, but not limited to, costs
of travel, ground transportation, lodging, and meals) associated with such
training or consulting. AvantGo shall maintain records of its expenses and
reimbursable items pertaining to Services on a generally recognized accounting
basis; these records shall be made available to Client upon request.

     b.   Charges for all long distance telephone calls incurred in providing
Services hereunder while travelling in connection with this PSA.

     c.   The actual cost of all written document reproduction.

     d.   Subject to the prior written approval of Client, purchase costs or
license fees for any third party software tools required to provide Services
hereunder. Such purchases and licenses shall become the property of Client upon
completion of Services rendered pursuant to the applicable Statement of Work.
For each Statement of Work, and as such expenses are identified, AvantGo shall
submit to Client an estimate of all expected third party costs.

     Unless otherwise provided in the Master Agreement between the parties, all
fees and reimbursable expenses shall be invoiced by AvantGo to Client on a
monthly basis and Client will pay such invoices within thirty (30) days after
date of invoice.

3.   TERM

     The initial term of this PSA shall be for the balance of the calendar year
in which it was executed, and shall thereafter be automatically renewed for
successive terms of one calendar year each unless earlier terminated as
<PAGE>

hereinafter provided or unless either party gives the other written notice of
non-renewal at least 30 days prior to the end of the initial term or any renewal
term.

4.   CONFIDENTIALITY; OWNERSHIP OF DEVELOPMENTS

     a.   AvantGo will treat the terms of this PSA as Confidential Information,
as further described in Exhibit B hereto.

     b.   AvantGo (i) shall use Confidential Information only in connection with
AvantGo's performance of its obligations under a Statement of Work, and (ii)
will not disclose Confidential Information except to AvantGo's employees,
agents, and contractors who have first agreed to be bound by the terms and
conditions of this Section and who have a need to know such Confidential
Information in connection with the performance of AvantGo's obligations under
this PSA or any Statement of Work and then only to the extent they need to know
AvantGo shall be responsible and liable for any unauthorized disclosure,
publication or dissemination by any of AvantGo's employees, agents or
contractors of any Confidential Information. This Section does not apply to any
information that (a) AvantGo can demonstrate that it possessed prior to the date
of this PSA without obligation of confidentiality, (b) AvantGo develops
independently without use of any confidential information, (c) AvantGo
rightfully receives from a third party without any obligation of confidentiality
to such third party, (d) is or becomes publicly available without breach of this
PSA, or (e) must be disclosed as required under applicable law or regulation;
provided however, that AvantGo must give Client reasonably notice prior to such
disclosure and shall reasonably cooperate, at Client's expense, with any efforts
requested by Client to limit the nature or scope of the disclosure.

     C.   AvantGo shall not remove from Client's premises the original or any
reproduction of any notes, memoranda, files, records, writings or other
documents, whether on tangible or electronic media, containing any Confidential
Information or any document prepared by or on behalf of AvantGo which contains
or is based on any Confidential Information ("Documents"), without the prior
written consent of an authorized representative of Client, and any such
Documents in AvantGo's possession or under its custody or control shall be
immediately turned over to Client or certify as having been destroyed upon the
request of Client or the termination of this PSA.

     d.   As used herein "Developed Materials" shall mean, hereunder, all
inventions, methods, techniques, works of authorship, computer software,
computer upgrades, computer programs, service providers, vendors information,
training materials, telemarketing scripts, computer screens reports, data, any
proprietary or confidential information made, created, developed or written in
accordance with the activities contemplated hereunder. In the event any
Developed Material (i) is fully paid for, or created by Client, or on behalf of
Client, and AvantGo has not provided material creative or developmental input
therein (including without limitation provision of proprietary or confidential
information), then such Developed Material shall be deemed the sole property of
Client and any use thereof by AvantGo shall required consent thereto by Client;
(ii) is substantially paid by, or substantially created by or on behalf of
Client and AvantGo has had a material creative or developmental input therein
(including without limitation provisions of proprietary or confidential
information), then such Developed Material shall be deemed the property of
Client with AvantGo having an non-exclusive, nontransferable and royalty-free
right of use thereof; (iii) is substantially paid by, or substantially created
by or on behalf of AvantGo and Client has had material creative or
developmental input therein (including without limitation provision of
proprietary or confidential information), then such Developed Material shall be
deemed the property of AvantGo with Client having a non-exclusive,
nontransferable and royalty-free right of use thereof; and (iv) is fully paid
for, or created by AvantGo, or on behalf of AvantGo, and Client has not provided
material creative or developmental input therein (including without limitation
provision of proprietary or confidential information), then such Developed
Material shall be deemed the sole property of AvantGo and any use thereof by
Client shall require consent thereto by AvantGo.

     e.   Notwithstanding anything to the contrary in this PSA, Client shall own
the specifications and all interface modules created by Client or any of its
third party contractors.

     f.   All Developed Material shall be deemed Confidential Information as
defined in this PSA.

     g.   Nothing herein shall be construed to restrict, impair or deprive
AvantGo or Client of any of their respective rights or proprietary interests in
technology, software, or products that existed prior to and independent of the
performance of their respective obligations hereunder.

6.   INSURANCE AvantGo shall, at its own expense, obtain and maintain the
following insurance:

     a.   Commercial General Liability, with coverage including but not limited
to, premises/operations, contractual, personal and advertising injury, and
products/completed operations liabilities, with limits of not less than
<PAGE>

$1,000,000 per occurrence for bodily injury and property damage combined. Limits
of liability requirements may be satisfied by a combination of Commercial
General Liability and Umbrella Excess Liability policies.

     b.   Workers' Compensation insurance for statutory limits.

     c.   AMEX will be named as an additional insured for the coverage
components identified in this Section 6.

7.   TERMINATION

     a.   Either party may terminate Services under any Statement of Work, but
only for the causes and in the manner set forth therein and, in the case of
termination by Client, upon payment of the amount set forth in the Statement of
Work for work completed.

     b.   Either party may terminate this entire PSA prior to its expiration
date, without cause, without penalty and without liability for damages as a
result of such termination by giving the other party at least thirty (30) days
prior written notice of termination; provided, that this PSA shall continue in
force as to any outstanding Statements of Work unless and until the Services
contemplated by the same are completed or the same are terminated in accordance
with their terms.

     C.   Upon termination of a Statement of Work then in process, Client shall
only be liable for payment of fees earned as a result of Services actually
performed under such Statement of Work prior to the date of termination.

8.   WARRANTIES

     8.1. AvantGo warrants that all Services shall be performed in a workmanlike
manner and according to the applicable description and requirements for such
Services as set forth in the applicable Statement of Work, and without
infringing any law, rule, regulation, United States or foreign copyright,
patent, trade secret or other proprietary rights of any third party.

     8.2. THE ABOVE WARRANTY IS IN LIEU OF ALL OTHER EXPRESS OR IMPLIED
WARRANTIES, INCLUDING THE WARRANTIES OF, MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE OR IMPLIED WARRANTIES ARISING OUT OF COURSE OF PERFORMANCE,
DEALING, USAGE OR TRADE, RELATED TO THIS PSA, THE TRANSACTIONS CONTEMPLATED
HEREBY, THE SERVICES AND THE DEVELOPMENTS.

     8.3. Survival. The terms of this Section 8 shall survive the termination
          --------
or expiration of this PSA

9.   LIMITATION OF LIABILITY

     9.1. IN NO EVENT WILL EITHER PARTY BE LIABLE TO THE OTHER FOR ANY LOST
PROFITS, LOSS OF BUSINESS, INTERRUPTION OF BUSINESS, LOSS OF USE, OR LOSS OF
DATA, OR FOR INDIRECT, INCIDENTAL, CONSEQUENTIAL, SPECIAL, PUNITIVE OR EXEMPLARY
DAMAGES, HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY. WHETHER CONTRACT, TORT
(INCLUDING NEGLIGENCE) OR OTHERWISE, UNDER OR ARISING OUT OF THIS PSA, EVEN IF
SUCH PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.

     9.2. NEITHER PARTY HERETO (THE "LIABLE PARTY") SHALL HAVE AN AGGREGATE
LIABILITY TO THE OTHER PARTY FOR DIRECT DAMAGES ARISING IN CONNECTION WITH THIS
PSA, REGARDLESS OF THE FORM OF ACTION GIVING RISE TO SUCH LIABILITY (WHETHER IN
CONTRACT, TORT OR OTHERWISE), THAT SHALL EXCEED THE AMOUNT PAID BY CLIENT UNDER
THE SCOPE OF WORK WHICH IS THE SUBJECT OF THE DISPUTE.

     9.3. THE LIMITATION SET FORTH IN SECTION 9.2. ABOVE SHALL NOT APPLY TO
DAMAGES ARISING DIRECTLY FROM (i) A NON-AFFILIATED THIRD PARTY CLAIM OR (ii) THE
INTENTIONAL MISCONDUCT OR GROSSLY NEGLIGENT ACT OR OMISSION OF THE LIABLE PARTY
IN THE COURSE OF THE PERFORMANCE OF ITS DUTIES OR OBLIGATIONS UNDER THIS PSA.

     9.4. Survival: The terms of this Section 9 shall survive termination or
          --------
expiration of this PSA
<PAGE>

                         Schedule A (to Attachment B)
                         ----------------------------

                               Statement of Work
                               -----------------

AvantGo Professional Services Agreement dated _________, by and between AvantGo,
Inc. ("AvantGo") and AMEX ("Client").

     The following activities are currently expected for the integration and
delivery of the Client's mobile/handheld solution. The time estimates for each
activity are simply estimates. In the end, the time for a particular activity
may be more or less than the original estimate as the project progresses. Also,
as the project moves towards completion, new activities might be incorporated
into the work plan and some activities might be removed. AvantGo will keep
Client informed on any substantial proposed changes and only proceed with such
changes upon Client approval. For each activity, the estimate includes time for
design, development and testing of each piece or functionality. The estimate
also includes time allotments for requirements gathering, technology discovery,
and any foreseeable integration efforts.

The Client's fees for a day of AvantGo Consulting Services are $******* per day
plus any additional travel related expenses.

High Level Work Plan and Estimates:
-----------------------------------

Project Assumptions and Exclusions
----------------------------------

 . Client will supply AvantGo all necessary products, tools, documentation, and
technical support necessary to complete the project.

 . AvantGo professional services engagements often include "project checkpoints".
AvantGo project checkpoints include re-evaluation of project goals, estimates,
and timelines based on new design detail and project knowledge. Any project
changes, adjustments or new estimates will be reviewed and approved by both
AvantGo and Client before commencing this part of the project. Project
checkpoints are an important tool/activity for any AvantGo project and play a
key role in the success of a project.

 . The project will be based and engineered in conjunction with the current
AvantGo software release (AvantGo 3.1). Licensing of any AvantGo products is
beyond the scope of this document. Development of complementary features under
this consulting engagement does not constitute a license to any AvantGo
products.

 . AvantGo will not be responsible for creation of any Client graphics on the
handheld device.

 . AvantGo will plan time before the end of the project, to transfer Project
Knowledge from the AvantGo Consulting Engineer responsible for the prototype to
a Client representative. This time will be charged at the contract rate.

 . Any project issues or integration barriers between AvantGo and Client
technologies will be relayed to Client immediately upon discovery and addressed
appropriately. Integration incompatibilities will not exclude Client from
contractual responsibilities for services rendered to that point.

 . AvantGo will commence work on the project upon acceptance of a purchase order
and this executed agreement. Further functional specifications and project
definition may be needed upon project start.

 . Ongoing support, additional development, and enhancements to the work product
created under this agreement will need to be negotiated outside of this
agreement.

[*]= CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY
WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT TO
THE OMITTED PORTIONS.

<PAGE>

                         Schedule B (to Attachment B)
                         ----------------------------

Each S.O.W. should contain all the following applicable information:

1.   AvantGo legal name.
2.   AvantGo address.
3.   AvantGo point of contact with phone number.
4.   AMEX Project Manager's name, phone number and E-mail Address.
5.   AvantGo Project Manager's Name and Phone Number.
6.   Type & frequency of performance status or other deliverable reports (if
     any).
7.   All other deliverables and acceptance criteria for deliverables, if
     applicable.
8    a. Include both AvantGo and AMEX deliverables if required.
9.   Total dollar amount if fixed price.
10.  If time and materials, hourly rate for regular and overtime hours.
     Employee's name if applicable. Also, total not-to-exceed dollar amount, if
     applicable.
11.  A detailed description of each task to be accomplished with a schedule
     (Start & Stop) for completion for each. Include interdependent actions if
     applicable such as information required to be provided from one party to
     the other in order to proceed.
12.  Roles and responsibilities of each party. Include interfaces needed,
     methods of project management, tools/software to be used (Method 1, M/S
     Projects or PMW Workbench), etc.
13.  The period of performance for the entire contract.
14.  Method and frequency of payment. Identify progress, milestone or other
     means of billing authorized. Identify if payment via Corporate Procurement
     Card (CPC) or invoice. If invoice, to whom in AMEX, invoice should be sent
     for approval with name, address and phone number.
15.  A Consultant Fee Expenditure Request (CFER) or Purchase Requisition (PR)
     must accompany the S.O.W. and the dollar amounts on the CFER or PR must
     equal the dollar value on the S.O.W.
16.  More specific warranty, acceptance or other clauses, if required.
17.  Any contractual options which must be included.
<PAGE>

                                 ATTACHMENT C
                                 ------------

                               LICENSE AGREEMENT

PLEASE READ CAREFULLY. THIS AGREEMENT CONTAINS THE COMPLETE TERMS AND CONDITIONS
THAT APPLY TO YOUR USE OF THE AVANTGO SOFTWARE (DEFINED BELOW). IN THIS
AGREEMENT, "AVANTGO" MEANS AVANTGO, INC., AND "LICENSEE" MEANS YOU. YOUR USE OF
THE AVANTGO SOFTWARE CONSTITUTES YOUR ACCEPTANCE OF ALL TERMS AND CONDITIONS SET
FORTH IN THIS AGREEMENT. AS USED IN THIS AGREEMENT, "AVANTGO SITE" REFERS TO THE
WORLD WIDE WEB SITE LOCATED AT WWW.AVANTGO.COM.

1.    Definitions.
      -----------

"Confidential Information" of AvantGo shall mean any information disclosed by
 ------------------------
AvantGo to Licensee pursuant to this Agreement which is in written, graphic,
machine readable or other tangible form and is marked "Confidential,"
"Proprietary" or in some other manner to indicate its confidential nature.
Confidential information may also include oral information disclosed by AvantGo
to Licensee pursuant to this Agreement, provided that such information is
designated as confidential at the time of disclosure. Notwithstanding any
failure to so identify it, the Software shall be deemed to constitute AvantGo's
Confidential Information.

"Designated Site" shall mean the address location specified in Licensee's
 ---------------
Purchase Order (defined below) where Licensee is permitted to install and
operate the Software in accordance with this Agreement.

"Identified Configuration" shall mean the combination of servers, handheld
 ------------------------
devices, and desktop computers specified in Licensee's Purchase Order with which
Licensee is authorized to use the Software.

"Purchase Order" shall mean the purchase order submitted by Licensee to AvantGo
 --------------
and accepted by AvantGo for Licensee's use of the Software. The Purchase Order
shall set forth certain information, including but not limited to, Licensee's
name, authorized contact name, address, the Designated Site, Identified
Configuration, Software Description, Number of Permitted User Handheld Devices,
License Fee, Maintenance and Support Fees, and the Term of Maintenance and
Support.

"Software" shall include the current version of the licensed AvantGo software
 --------
and related documentation, if any, AvantGo makes available to Licensee under
this Agreement. Software shall include all Updates, Upgrades, and other
modifications to the Software AvantGo makes available to Licensee during the
term of this Agreement.

"Specifications" shall mean AvantGo's published specifications for the Software.
 --------------

"Update" means additional or replacement code for the Software that is provided
 ------
by AvantGo to remedy an error or minor bug.

"Upgrade" means any additional or replacement code for the Software provided by
 -------
AvantGo that is designated by AvantGo, in its sole discretion, as a new version
of the Software and is generally commercially available.

2.    Delivery and Acceptance. The Software is being delivered through
      -----------------------
electronic means as of the date on which Licensee downloads and installs the
Software from the AvantGo Site or as otherwise electronically distributed by
AvantGo (the "Delivery Date"). The Software will be deemed accepted on the
Delivery Date. If Licensee does not accept these terms and conditions, or
Licensee is not satisfied with the Software for any reason, Licensee may return
the Software to AvantGo within ten (10) calendar days of the Delivery Date.
Licensee shall "return" the Software to AvantGo by destroying all copies of the
Software (including any archival copies) and providing written certification of
the same within five (5) calendar days of such destruction.

3.    License Grant.
      -------------

3.1   Grant. AvantGo hereby grants to Licensee a nonexclusive, nontransferable
      -----
license, without rights to sublicense, to (a) install the server components of
the Software ("AvantGo Server") solely on computers owned or controlled by
Licensee and located at the Designated Site, (b) install the client components
of the Software ("AvantGo Client") on the number of handheld devices specified
in the Purchase Order to be used by employees and contractors of Licensee, and
(c) to allow the number of employees and/or contractors of Licensee set forth in
the Purchase Order to use the Software solely with the Identified Configuration
and solely for internal business purposes. Avantgo Enterprise Publisher
Licensees are restricted to read-only capabilities (no license for "forms" use)
and may not use the Software with SSL, PODS, JavaScript, AvantGo's Conduit API
or AvantGo's Provider API. AvantGo reserves all rights in the Software which are
not expressly granted in this Agreement.

3.2   Additional Licensee. Licensee may order licenses for additional AvantGo
      -------------------
Server software or AvantGo Client user seats by completing and submitting to
AvantGo an Order Form. When submitted by Licensee and accepted by AvantGo, such
Order Form shall become a part of this Agreement. Licensee acknowledges and
agrees that all such additional licenses shall be governed by the terms of this
Agreement, without regard to the terms set forth on any Purchase Order (except
those terms specifically set forth in the definition of Purchase Order above)
pertaining to such order.

3.3   Restrictions. Licensee agrees that Licensee and its employees and
      ------------
contractors shall not, directly or indirectly, (a) sell, lease, assign,
sublicense or otherwise transfer, (b) disclose, divulge or otherwise make
available to any third party, (c) use except as authorized by this Agreement,
(d) decompile, disassemble or otherwise analyze for reverse engineering
purposes, (e) modify or change the Software in any manner, or (f) export the
Software. Licensee shall not sublicense, rent or time-share the Software.
Licensee will have the right to make one (1) backup copy of the Software solely
for archival purposes.

3.4    Maintenance. AvantGo will provide reasonable customer support to Licensee
       -----------
for Software licensed directly from AvantGo as set forth in AvantGo's Standard
Support and Maintenance policy. If Licensee licenses the Software from any third
party, Licensee will receive customer support, if any, from such third party in
accordance with such party's applicable support and maintenance terms.

4.    Ownership Rights. Except as expressly set forth herein, AvantGo or its
      ----------------
licensors shall own all right, title and interest in and to the Software.
Licensee will not remove any notices from the Software as delivered to Licensee,
and will include such notices in all copies of the Software made under this
Agreement.

5.    Payments.
      --------

5.1   License Fees. Licensee will pay AvantGo the per-user license fees in
      ------------
accordance with the Purchase Order. The per-user license fees may be changed
from time to time upon notice by AvantGo to Licensee. Such license fees shall be
due and payable within thirty (30) days after the date of AvantGo's invoice to
the Licensee.

5.2   Support and Consulting Fees. In addition, if Licensee acquired the
      ---------------------------
Software directly from AvantGo, Licensee will pay AvantGo ******* percent (**%)
of AvantGo's then current list license fee per year for each copy of the
Software for which Licensee desires to receive support and/or consulting as
identified in the applicable Purchase Order. Such support fees shall be due and
payable within thirty (30) days prior to the commencement of the annual support
term. Any fees for consulting services AvantGo provides to Licensee will be due
and payable within thirty (30) days after the date of AvantGo's invoice for such
consulting fees.

jurisdiction, from the remainder of this Agreement, which shall remain in
full force and effect.

15.3  Relationship of the Parties.  AvantGo and Licensee are independent
      ---------------------------
contractors under this Agreement.  Nothing contained in this Agreement is
intended nor is it to be construed so as to constitute AvantGo and Licensee as
partners or joint venturers with respect to this Agreement.  Employees of any
party remain employees of said party and shall at no time be considered agents
of or to be obligated to render a fiduciary duty to the other party.

15.4  Waiver.  The failure of any party to enforce at any time any of the
      ------
provisions of this Agreement shall in no way be construed to be a present or
future waiver of such provisions, nor in any way affect the right of any party
to enforce each and every such provision thereafter.  The express waiver by any
party of any provision, condition or requirement of this Agreement shall not
constitute a waiver of any future obligation to comply with such provision,
condition or requirement.

15.5  Assignment.  Licensee may not assign or otherwise transfer in any way any
      ----------
of Licensee's rights and/or obligations under or arising out of this Agreement
without the prior written consent of AvantGo.  AvantGo may assign its rights,
privileges, and obligations, in whole or in part, under this Agreement without
the consent of Licensee.

15.6  Entire Agreement.  The terms and conditions contained in this Agreement,
      ----------------
including any hypertext links, Purchase Orders and applicable policies on the
AvantGo Site, constitute the entire agreement between the parties and supersede
any contradictory terms of any previous or subsequent Purchase Order submitted
by Licensee and accepted by AvantGo, all previous agreements and understandings,
whether oral or written, between the parties hereto with respect to the subject
matter hereof and thereof.

15.7  The Standard Support and Maintenance Plan below is incorporated herein by
reference.

                     STANDARD SUPPORT AND MAINTENANCE PLAN
                     -------------------------------------
Definitions:
------------

"Error" shall mean any verifiable and reproducible failure of the Software to
 -----
substantially conform to the Specifications for such Software.  Notwithstanding
the foregoing, "Error" shall not include any such failure that is caused by: (i)
the use or operation of the Software with an application or in an environment
other than that intended or recommended by AvantGo or (ii) modifications to the
Software not made by AvantGo.

"Error Correction(s)" shall mean either a modification or addition to or
 -------------------
deletion from the Software that substantially conforms such Software to the
then-current Specifications or a procedure or routine that, when observed in the
regular operation of the Software eliminates any material adverse effect on
Licensee of such Error.

1.    Service Responsibilities of AvantGo.  In consideration of the maintenance
-----------------------------------------
and support fees in Section 6 below which are paid to AvantGo by the Licensee,
AvantGo shall use commercially reasonable efforts to provide the following
support services in accordance with the provisions of this Agreement:

 .     Provide Licensee technical support and information for AvantGo Software as
   related to Software use, configuration, maintenance, and troubleshooting.
   AvantGo is not responsible for technical support of or assistance with
   Licensee's custom developed content or software used in conjunction with
   AvantGo Software.

 .     Provide access to technical support via telephone, electronic mail, online
   form submission, and facsimile. Licensee will designate two (2) Licensee
   support contacts to AvantGo. All Licensee technical support requests must
   originate from a Licensee designated support representative and must include
   a description of the problem, any pertinent log information, any error
   messages, AvantGo Software Version, server operating system version, make and
   model of handheld PC with operating system version and any other information
   as described in "Licensee Responsibilities" below. AvantGo Technical Support
   responses will be directed to the Licensee designated support representative.

 .     Confirm and provide initial response to support requests within one
   business day from time of submission.

 .   Actively manage problem prioritization and incident resolution. All open
   (unresolved) support requests (incidents) will be prioritized by the
   Licensee's designated support representative as either High Priority (AvantGo
   Software is not functioning at all and no work around is available), Medium
   Priority (AvantGo Software is functioning, however, the server operation is
   impaired, degraded, or not fully functional) or Low Priority (AvantGo
   Software is fully functioning but additional information or assistance is
   requested). AvantGo Technical Support will address all incidents in order of
   Priority with High priority incidents being addressed first.

 .     Communicate progress toward incident resolution to the Licensee's
   designated support representative until all incidents have been closed.

 .   Promptly provide any and all updated software documentation for any Updates
   or Upgrades provided to the Licensee in accordance with this agreement.
   Licensee will receive access to an online documentation center which will
   include current AvantGo technical documentation and information.

2.    Updates and Upgrades.  AvantGo shall promptly make available to Licensee
      --------------------
any Updates and Upgrades to the Software at no extra charge, subject to the
limitations explicitly set forth below in Section 4 below. AvantGo will make
such Updates and Upgrades available to Licensee when AvantGo makes such Updates
and Upgrades generally available to its other customers then covered by
maintenance.

3.    Current Release. AvantGo's support obligations with respect to the
      ---------------
Software shall apply only to the most current release of the Software. AvantGo
shall have the right, at any time after a particular release has been superseded
by another release, to terminate support with respect to the superseded release
upon giving not less than ninety (90) days notice to the Licensee.

4.    Limitations. Support does not include services for any failure or defect
      -----------
in the Software caused by any of the following: (a) the improper use,
alteration, or damage of the Software by Licensee or persons other than AvantGo
employees or consultants; (b) modifications to the Software not made or
authorized by AvantGo; or (c) interaction between the Software and operating
systems, database software and other software, when AvantGo has not approved
such operating system, database software, and other software for use with the
Software. In addition, AvantGo reserves the right to discontinue support any
Software which has not been continuously supported by Licensee pursuant to
AvantGo's then-current support and maintenance plan. If AvantGo agrees to remedy
any errors or problems not covered by the terms of this Exhibit, Licensee shall
pay AvantGo for all such work performed at AvantGo's then-current standard time
and material rates.

5.    Licensee Responsibilities. In order for AvantGo to perform diagnostic
      -------------------------
testing and fault isolation with minimal system interruption, Licensee shall
provide AvantGo with remote access to the Software at the Licensee Site
experiencing an Error.  Licensee agrees to notify AvantGo in writing promptly
following the discovery of any Error.  Further, upon discovery of an Error,
Licensee agrees, if requested by AvantGo, to submit to AvantGo a list of output
and any other data that AvantGo may reasonably require to reproduce the Error
and the operating conditions under which the Error occurred or was discovered.

6.    Support Fees. Licensee shall pay AvantGo the annual support fee in order
      ------------
to receive the support services set forth in this Agreement. The current support
fee is set at **% of Licensee Fee. The support fee may be changed from time to
time upon notice by AvantGo.

[*] = CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY
WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT TO
THE OMITTED PORTIONS.
<PAGE>

5.3  Taxes. The Licensee shall be responsible for, and shall indemnify and hold
     -----
AvantGo harmless from, all export, withholding, federal, state and local taxes,
duties or excises arising out of the transactions contemplated by this
Agreement, excluding only taxes based on AvantGo's net income.

5.4  Late Payments. All amounts which Licensee does not pay on a timely basis as
     -------------
required by this Agreement shall be subject to a late charge equal to one and
one-half percent (1.5%) per month (or, if less, the maximum allowed by
applicable law). In the event that any payment due hereunder is overdue, AvantGo
reserves the right to suspend performance until such delinquency is corrected.

6.   Trademarks. Nothing in this Agreement shall be construed to be a grant to
     ----------
Licensee by AvantGo of any actual or implied license to use AvantGo's
trademarks, trade names or service marks.

7.   Disclaimer of Warranties. THE SOFTWARE WILL BE PROVIDED "AS IS", AND
     ------------------------
AVANTGO SPECIFICALLY DISCLAIMS ALL WARRANTIES OF MERCHANTABILITY,
NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE IN CONNECTION THEREWITH.

8.   Term and Termination.
     --------------------

8.1  Term. This Agreement shall become effective upon AvantGo's acceptance of
     ----
the applicable Purchase Order and shall continue in effect unless earlier
terminated in accordance with this Section 8.

8.2  Default. If either party defaults in the performance of any of its
     -------
material obligations hereunder and such default is not corrected within (30)
days after written notice thereof by the other party, then such other party, at
its option, may terminate this Agreement by giving written notice of termination
to the defaulting party.

8.3  Survival. Sections 1 and 4 through 15 shall survive any termination or
     --------
expiration of this Agreement.

8.4  Effect of Termination. Upon the termination of this Agreement, Licensee
     ---------------------
will promptly destroy or return to AvantGo all copies of the Software purchased
hereunder and all AvantGo Confidential Information received hereunder.

9.   Indemnification.
     ---------------

9.1  Indemnity. AvantGo agrees, at its own expense as applicable, to defend or
     ---------
at its option to settle, any claim brought against Licensee for infringement of
any United States copyright of any third party by the Software as delivered to
the Licensee under this Agreement, provided that Licensee provides AvantGo with:
(a) prompt written notice of such claim; (b) control over the defense and
settlement of such claim; and (c) proper and full information and assistance to
settle and/or defend any such claim, (b) control over the defense and
settlement of such claim; and (c) proper and full information and assistance to
settle and/or defend any such claim. If an injunction is, or AvantGo believes in
its sole discretion is likely to be, entered prohibiting Licensee from
exercising its right to use the Software granted hereunder, AvantGo may, at its
sole option and expense, (w) procure for Licensee the right to use the Software
as provided herein; (x) replace the Software or a portion thereof with other
non-infringing products; (y) modify the Software so that it is not infringing;
or (z) accept return of the Software and terminate this Agreement. AvantGo will
not be liable for any costs or expenses incurred by Licensee in connection with
any claims subject to the terms of this Section without prior written
authorization by AvantGo.

9.2  Exceptions. Notwithstanding the provisions of this Section 9.
     ----------
AvantGo assumes no liability for infringement claims arising from: (a)
combination of the Software with other products not provided by AvantGo, if such
infringement claims would not have arisen with respect to the Software standing
alone; (b) any modifications to the Software unless such modifications was made
by AvantGo; or (c) any intellectual property rights other than U.S. patent or
copyright.

9.3  Limitation. The foregoing provisions of this Section 9 state the entire
     ----------
liability and obligations of AvantGo and the sole and exclusive remedy of
Licensee, with respect to any actual or alleged infringement of any intellectual
property right by the Software.

10.  Limitation of Liability.  IN NO EVENT SHALL AVANTGO BE LIABLE TO LICENSEE
     -----------------------
FOR LOST PROFITS OR ANY CONSEQUENTIAL, SPECIAL, INCIDENTAL, OR INDIRECT DAMAGES
OF LICENSEE. HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, ARISING OUT OF OR IN
CONNECTION WITH THIS AGREEMENT OR THE USE, RESULTS OF USE, OR INABILITY TO USE,
THE SOFTWARE. THESE LIMITATIONS SHALL APPLY NOTWITHSTANDING ANY FAILURE OF
ESSENTIAL PURPOSE OF ANY LIMITED REMEDY. IN NO EVENT WILL AVANTGO'S LIABILITY
ARISING UNDER OR IN ANY WAY CONNECTED WITH THIS AGREEMENT EXCEED THE PAYMENTS
ACTUALLY RECEIVED BY AVANTGO UNDER SECTION 5 ABOVE DURING THE PRECEDING TWELVE
(12) MONTH PERIOD.

11.  Confidentiality.
     ---------------

11.1 Nondisclosure. Licensee shall treat as confidential all Confidential
     -------------
Information, shall not use such Confidential Information except as set forth
herein, and shall use reasonable efforts not to disclose such Confidential
Information to any third party. Without limiting the foregoing, Licensee shall
use at least the same degree of care which it uses to prevent the disclosure of
its own confidential information of like importance to prevent the disclosure of
Confidential Information disclosed to it by AvantGo under this Agreement.

11.2 Exceptions. Notwithstanding the above, License shall not be liable to
     ----------
AvantGo with regard to any Confidential Information which Licensee can prove:
(a) was in the public domain at the time it was disclosed or has entered the
public domain through no fault of Licensee; (b) was known to Licensee, without
restriction, at the time of disclosure; or (c) is disclosed with the prior
written approval of AvantGo.

11.3 Return of Confidential Information. Upon expiration or termination of this
     ----------------------------------
Agreement, Licensee shall return all Confidential Information received from
AvantGo.

11.4 Remedies. Licensee's breach of the restrictions contained in this Section
     --------
11 constitutes a material breach of this Agreement which may cause irreparable
harm to AvantGo. Any such breach by Licensee shall entitle AvantGo to injunctive
relief in addition to all legal remedies.

12.  Confidentiality of Agreement. AvantGo may publicly identify Licensee as a
     ----------------------------
Software user in presentations, press releases, on AvantGo's Site, advertising
and marketing materials without Licensee's consent. Any press release to be
issued by Licensee in connection with the terms and conditions or existence of
this Agreement must be approved in advance by AvantGo.

13.  Export Restrictions. Licensee acknowledges and agrees that the Software is
     -------------------
subject to restrictions and controls imposed by the Export Administration Act
and the Export Administration Regulations and other laws and regulations of the
United States and any other applicable government or jurisdiction as enabled by
the United States or such other government or jurisdiction from time to time
("the Acts"). Licensee hereby agrees to comply with such restrictions and
controls as imposed by the Acts.

14.  U.S. Government Restrictions Rights. The Software is provided with
     -----------------------------------
RESTRICTED RIGHTS. Use, duplication, or disclosure by the United States
Government or any of its agencies is subject to restrictions as set forth in
subparagraph (c)(1)(ii) of the Rights in Technical Data and Computer Software
clause at DFARS 252.227-7013 or subparagraphs (c)(1) and (2) of the Commercial
Computer Software-Restricted Rights at 48 CFR 52.227-19. as applicable.
Manufacturer is AvantGo, Inc./1700 S. Amphiett Blvd., Suite 300/San Mateo, CA
94402.

15.  General.
     -------

15.1 Governing Law and Jurisdiction. This Agreement shall be governed by and
     ------------------------------
interpreted in accordance with the laws of the State of California, without
reference to conflicts of laws provisions. The parties hereby consent to the
exclusive jurisdiction and venue of the state and federal courts of Santa Clara
County, California.

15.2 Partial Invalidity. If any provision in this Agreement shall be found or be
     ------------------
held to be invalid or unenforceable in any jurisdiction in which this Agreement
is being performed, then said provision shall be severed, solely in such
<PAGE>

jurisdiction, from the remainder of this Agreement, which shall remain in full
force and effect.

15.3 Relationship of the Parties. AvantGo and Licensee are independent
     ---------------------------
contractors under this Agreement. Nothing contained in this Agreement is
intended nor is it to be construed so as to constitute AvantGo and Licensee as
partners or joint venturers with respect to this Agreement. Employees of any
party remain employees of said party and shall at no time be considered agents
of or to be obligated to render a fiduciary duty to the other party.

15.4 Waiver. The failure of any party to enforce at any time any of
     ------
the provisions of this Agreement shall in no way be construed to be a present or
future waiver of such provisions, nor in any way affect the right of any party
to enforce each and every such provision thereafter. The express waiver by any
party of any provision, condition or requirement of this Agreement shall not
constitute a waiver of any future obligation to comply with such provision,
condition or requirement.

15.5 Assignment. Licensee may not assign or otherwise transfer in any way of
     ----------
Licensee's rights and/or obligations under or arising out of this Agreement
without the prior written consent of AvantGo. AvantGo may assign its rights,
privileges, and obligations, in whole or in part, under this Agreement without
the consent of Licensee .

15.6 Entire Agreement. The terms and conditions contained in this Agreement,
     ----------------
including any hypertext links, Purchase Orders and applicable policies on the
AvantGo Site, constitute the entire agreement between the parties and supersede
any contradictory terms of any previous or subsequent Purchase Order submitted
by Licensee and accepted by AvantGo, all previous agreements and understandings,
whether oral or written, between the parties herein with respect to the subject
matter hereof and thereof.

15.7 The Standard Support and Maintenance Plan below is incorporated herein by
reference.

                    STANDARD SUPPORT AND MAINTENANCE PLAN
                    -------------------------------------

Definitions:
-----------

"Error" shall mean any verifiable and reproducible failure of the Software to
 -----
substantially conform to the Specifications for such Software. Notwithstanding
the foregoing, "Error" shall not include any such failure that is caused by: (i)
the use or operation of the Software with an application or in an environment
other than that intended or recommended by AvantGo or (ii) modifications to the
Software not made by AvantGo.

"Error Correction(s)" shall mean either a modification or addition to or
 -------------------
deletion from the Software that substantially conforms such Software to the
then-current Specifications or a procedure or routine that, when observed in the
regular operation of the Software eliminates any material adverse effect on
Licensee of such Error.

1.   Service Responsibilities of AvantGo. In consideration of the maintenance
     -----------------------------------
and support fees in Section 6 below which are paid to AvantGo by the Licensee,
AvantGo shall use commercially reasonable efforts to provide the following
support services in accordance with the provisions of this Agreement:
 .    Provide Licensee technical support and information for AvantGo Software as
  related to Software use, configuration, maintenance, and troubleshooting.
  AvantGo is not responsible for technical support of or assistance with
  Licensee's custom developed consent or software used in conjunction with
  AvantGo Software.
 .    Provide access to technical support via telephone, electronic mail, online
  form submission, and facsimile. Licensee will designate two (2) Licensee
  support contacts to AvantGo. All Licensee technical support requests must
  originate from a Licensee designated support representative and must include a
  description of the problem, any pertinent log information, any error messages,
  AvantGo Software Version, server operating system version, make and model of
  hand held PC with operating system version and any other information as
  described in "Licensee Responsibilities" below. AvantGo Technical Support
  responses will be directed to the Licensee designated support representative.
 .    Confirm and provide initial response to support requests within one
  business day from time of submission.
 .    Actively manage problem prioritization and incident resolution. All open
  (unresolved) support requests (incidents) will be prioritized by the
  Licensee's designated support representative as either High Priority (AvantGo
  Software is not functioning at all and no work around is available), Medium
  Priority (AvantGo Software is functioning, however, the server operation is
  impaired, degraded, or not fully functional) or Low Priority (AvantGo Software
  is fully functioning but additional information or assistance is requested).
  AvantGo Technical Support will address all incidents in order of Priority with
  High priority incidents being addressed first.
 .    Communicate progress toward incident resolution to the Licensee's
  designated support representative until all incidents have been closed.
 .    Promptly provide any and all updated software documentation for any Updates
  of Upgrades provided to the Licensee in accordance with this agreement.
  Licensee will receive access to an online documentation center which will
  include current AvantGo technical documentation and information.

2.   Updates and Upgrades. AvantGo shall promptly make available to Licensee any
     --------------------
Updates and Upgrades to the Software at no extra charge, subject to the
limitations explicity set forth below in Section 4 below. AvantGo will make such
Updates and Upgrades available to Licensee when AvantGo make such Updates and
Updates generally available to its other customers then covered by maintenance.

3.   Current Release. AvantGo's support obligations with respect to the Software
     ---------------
shall apply only to the most current release of the Software. AvantGo shall have
the right, at any time after a particular release has been superseded by another
release, to terminate support with respect to the superseded release upon
giving not less than ninety (90) days notice to the Licensee.

4.   Limitations. Support does not include services for any failure or defect in
     -----------
the Software caused by any of the following: (a) the improper use, alteration,
or damage of the Software by Licensee or persons other than AvantGo employees or
consultants; (b) modifications to the Software not made or authorized by
AvantGo; or (c) interaction between the Software and operating systems, database
software and other software, when AvantGo has not approved such operating
system, database software, and other software for use with the Software. In
addition, AvantGo reserves the right to discontinue support any Software which
has not been continuously supported by Licensee pursuant to AvantGo's then-
current support and maintenance plan. Licensee pursuant to AvantGo's then-
current support and maintenance plan. If AvantGo agrees to remedy any errors or
problems not covered by the terms of this Exhibit, Licensee shall pay AvantGo
for all such work performed at AvantGo's then-current standard time and material
rates.

5.   Licensee Responsibilities. In order for AvantGo to perform diagnostic
     -------------------------
testing and fault isolation with minimal system interruption, Licensee shall
provide AvantGo with remote access to the Software at the Licensee Site
experiencing an Error. Licensee agrees to notify AvantGo in writing promptly
following the discovery of any Error. Further, upon discovery of an Error,
Licensee agrees, if requested by AvantGo, to submit to AvantGo a list of output
and any other data that AvantGo may reasonably require to reproduce the Error
and the operating conditions under which the Error occurred or was discovered.

6.   Support Fees. Licensee shall pay AvantGo the annual support fee in order to
     ------------
receive the support services set forth in this Agreement. The current support
fee is set at 15% of Licensee Fee. The support fee may be changed from time to
time upon notice by AvantGo.

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