<PAGE>

                                                                    Exhibit 10.9


THE SECURITIES REPRESENTED BY THIS WARRANT HAVE NOT BEEN REGISTERED UNDER THE
SECURITIES ACT OF 1933, AND HAVE BEEN ACQUIRED FOR INVESTMENT AND NOT WITH A
VIEW TO, OR IN CONNECTION WITH, THE SALE OR DISTRIBUTION THEREOF. NO SUCH SALE
OR DISTRIBUTION MAY BE EFFECTED WITHOUT AN EFFECTIVE REGISTRATION STATEMENT
RELATED THERETO OR AN OPINION OF COUNSEL IN A FORM SATISFACTORY TO THE COMPANY
THAT SUCH REGISTRATION IS NOT REQUIRED UNDER THE SECURITIES ACT OF 1933 OR SOLD
PURSUANT TO RULE 144(k), THE COMPLIANCE WITH WHICH IS DETERMINED TO THE
REASONABLE SATISFACTION OF THE COMPANY.

                             CLICK COMMERCE, INC.

                       Warrant to Purchase Common Stock

                                818,226 Shares

                    April 20, 2000 (the "Date of Issuance")



     Click Commerce, Inc. (the "Company"), for value received, hereby certifies
that Andersen Consulting, LLP, or its permitted registered assigns (the
"Registered Holder"), is entitled, subject to the terms set forth below, to
purchase from the Company up to 818,226 shares (as adjusted from time to time
pursuant to the provisions of this Warrant) of Common Stock of the Company, at a
purchase price of $12.222 per share. The shares purchasable upon exercise of
this Warrant and the purchase price per share, as adjusted from time to time
pursuant to the provisions of this Warrant, are sometimes hereinafter referred
to as the "Warrant Stock" and the "Purchase Price," respectively.

     1.   Exercise.
          --------

          (a)  Vesting. This Warrant shall vest for 10% of the total number of
               -------
shares of Warrant Stock for each $4 million of cumulative Qualifying Revenue (as
defined below) under Qualifying Orders (as defined below) placed by Designated
Customers (as defined below) (each such $4 million increment is referred to
herein as a "$4 Million Increment"). Upon a Company Change of Control (as
defined below), the amount of cumulative Qualifying Revenue shall be
automatically increased to the next highest $4 Million Increment regardless of
whether sufficient Qualifying Revenue shall have been generated and a
corresponding amount of Warrant Stock shall vest as of such Company Change of
Control. This Warrant shall be canceled and shall not be exerciseable if, and to
the extent that, any shares of Warrant Stock shall not have vested by the fourth
anniversary of the Date of Issuance as a result of fees received pursuant to
Qualified Orders.

               (i)  "AC" shall mean Andersen Consulting LLP.

               (ii) "AC Affiliate" shall mean and refer to all entities
                    throughout the world comprising the Andersen Consulting
                    worldwide
<PAGE>

                     organization (i.e., any Andersen Consulting entity having a
                     Member Firm Interfirm Agreement with Andersen Worldwide or
                     any successor entity to Andersen Worldwide, or any other
                     entity controlling, controlled by or under common control
                     with such an entity or a partner of Andersen Worldwide or
                     any successor entity). At the request of the Company, AC
                     shall promptly confirm whether any entity is an "AC
                     Affiliate".

               (iii) "AC Competitor" shall mean those entities identified by AC
                     as competitors of AC Affiliates in a written notice to the
                     Company which is acknowledged and agreed to by the Company
                     prior to the Date of Issuance (the "Initial Competitors")
                     and such additional entities as the parties shall
                     reasonably agree from time to time compete with an AC
                     Affiliate in the same manner and to the same extent as the
                     Initial Competitors.

               (iv)  "Designated Customer" means an AC Entity or any other third
                     party that (A) is introduced to the Company by AC, AC
                     Affiliates or other parties reasonably agreed to by AC and
                     the Company (AC together with such AC Affiliates and other
                     entities, the "AC Entities") or (B) is introduced to AC by
                     the Company, and, in either case, as to which personnel of
                     the AC Entities play a material role, and the AC Entities
                     provide a reasonable level of assistance, in the marketing
                     efforts related to such party's decision to purchase or
                     license software, software goods or services from the
                     Company. AC shall notify the Company that the introduced
                     party would constitute a Designated Customer if a sale or
                     license shall be consummated. If the Company disagrees with
                     such designation, the Company shall notify AC within ten
                     (10) days after delivery of the designation notice by AC.
                     The Company may indicate its disagreement with such
                     designation only if the Company or any other party with
                     which the Company has engaged in joint marketing activities
                     (a "Click Marketing Partner") has had material contact with
                     the prospect which is the subject of the designation in the
                     180 days prior to receipt of the designation notice and
                     begun material marketing activities. The parties shall
                     diligently pursue the consummation of a Qualifying Order
                     with each Designated Customer and the Company shall
                     negotiate in good faith a Qualifying Order with such
                     Designated Customer. The parties agree to negotiate in good
                     faith to resolve any disputes with respect to the
                     designation of Designated Customers in a manner that
                     reflects the relative contributions of the parties.

               (v)   "Expiration Date" means the third anniversary of this
                     Agreement.

               (vi)  "Qualifying Order" means a definitive agreement (including
                     any purchase order and amendments to an agreement or
                     additional

                                       2
<PAGE>

                     purchase orders issued under an agreement) for the purchase
                     or license of software, software goods and/or services from
                     the Company or a subsidiary entered into on or prior to the
                     Expiration Date.

               (vii) "Qualifying Revenue" shall mean, with respect to each
                     Qualifying Order, fees (including software licenses and
                     consulting fees and on-going maintenance and support
                     services but excluding any taxes (other than taxes based on
                     the Company's net income), interest or similar charges with
                     respect to such purchase) determined as follows: (A) upon
                     execution of the Qualifying Order, 50% of the fees
                     indicated in the Qualifying Order to be received by the
                     Company or its subsidiaries (the "Initial Credit") shall
                     constitute "Qualifying Revenue" and (B) following the
                     initial recognition by the Company of fees under such
                     Qualifying Order equal to the Initial Credit, fees
                     initially recognized by the Company under such Qualifying
                     Order on or before the fourth anniversary of the Date of
                     Issuance shall constitute "Qualifying Revenue". Within 30
                     days following the end of each fiscal quarterly period or
                     within 10 days prior to the expiration or termination of
                     this Warrant for the period through such expiration or
                     termination, the Company shall give notice to the
                     Registered Holder of the recognition of such fees during
                     such immediately preceding quarterly period. The Company
                     shall calculate the recognition of fees pursuant to this
                     subsection in the same manner which the Company calculates
                     recognition of its revenue for financial accounting
                     purposes (which shall be in accordance with generally
                     accepted accounting procedures consistently applied)
                     provided that fees recognized for purposes of this
                     subsection shall not be subject to any subsequent
                     adjustment or amortization requirement.

          (b)  Manner of Exercise. Subject to the provisions of Section 1(a)
               ------------------
above, this Warrant may be exercised by the Registered Holder, in whole or in
part, by surrendering this Warrant, with the notice of exercise and if not
previously executed by the Registered Holder, the stockholder and investor
joinder agreement, appended hereto as Exhibits A and B, respectively, duly
executed by such Registered Holder or by such Registered Holder's duly
authorized attorney, at the principal office of the Company, or at such other
office or agency as the Company may designate, accompanied by payment in full of
the Purchase Price payable in respect of the number of shares of Warrant Stock
purchased upon such exercise. The Purchase Price may be paid by cash, check,
wire transfer, by the surrender of promissory notes or other instruments
representing indebtedness of the Company to the Registered Holder or by the
delivery of vested Warrants in a cashless exercise pursuant to Section 2(f)
hereof.

          (c)  Exercise Dates. This Warrant may be exercised only after the
               --------------
earlier of (i) the number of shares of Warrant Stock being acquired have vested
in accordance with Section 1(a) above, or (ii) the closing date of a "Company
Change in Control" transaction with respect to

                                       3
<PAGE>

the Company; provided, however, that this Warrant may not be exercised prior to
the first anniversary of the Date of Issuance. This Warrant may not be exercised
after the fourth anniversary of the Date of Issuance.

               (i)  "Company Change of Control" shall mean the occurrence of any
                    of the following with regard to the Company: (A) the sale,
                    lease, transfer, conveyance, or other disposition (other
                    than by way of merger or consolidation), in one or a series
                    of related transactions, of all or substantially all of the
                    assets of the Company to any "person" or "group" (as such
                    terms are used in Section 13(d) and Section 14(d) of the
                    Securities Exchange Act of 1934, as amended (the "Exchange
                    Act") or any successor provisions), (B) the adoption of a
                    plan relating to the liquidation or dissolution of the
                    Company, (C) the consummation of a transaction (including,
                    without limitation, any merger or consolidation) the result
                    of which is that any "person" or "group" (as defined above)
                    becomes the "beneficial owner" (as defined in Rule 13d-3 and
                    13d-5 of the Exchange Act), directly or indirectly, of more
                    of than 35% of the voting power of the Company (excluding
                    from the definition of "person" the individuals or entities
                    owning common stock of the Company on the date of issuance
                    of this Warrant), (D) the consummation of a transaction
                    (including, without limitation, any merger or consolidation)
                    the result of which is that any "person" or "group" (as
                    defined above) which is, or includes, an AC Competitor
                    becomes the "beneficial owner" (as defined in Rule 13d-3 and
                    13d-5 of the Exchange Act), directly or indirectly, of more
                    of than 20% of the voting power of the Company (excluding
                    from the definition of "person" the individuals or entities
                    owning common stock of the Company on the date of issuance
                    of this Warrant) or (E) the first date on which a majority
                    of the members of the Board of Directors of the Company are
                    not "Continuing Directors" (as defined below).

               (ii) "Continuing Directors" means, as of the date of
                    determination, any member of the Board of Directors of the
                    Company who (x) was a member of the Board of Directors on
                    the date prior to the transaction or series of transactions
                    resulting in the Company Change in Control or (y) was
                    nominated for election or elected to such Board of Directors
                    with the approval of a majority of the Continuing Directors
                    who were members of such Board of Directors at the time of
                    such nomination or election.

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

                                       4
<PAGE>

issuable upon such exercise as provided in Section 1(f) below shall be deemed to
have become the holder or holders of record of the Warrant Stock represented by
such certificates.

          (e)  Delivery to Holder. Within ten days after the exercise of this
               ------------------
Warrant, in whole or in part, the Company will cause to be issued in the name
of, and delivered to, the Registered Holder, or as such Registered Holder (upon
payment by such Registered Holder of any applicable transfer taxes) may direct:

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

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

          (f)  Net Exercise. In lieu of cash exercising this Warrant, the
               ------------
Registered Holder may elect to receive shares equal to the value of this Warrant
(or the portion thereof being canceled) by surrender of this Warrant at the
principal office of the Company together with notice of such election, in which
event the Company shall issue to the holder hereof a number of shares of Warrant
Stock computed using the following formula:

                                    Y (A - B)
                                   -----------

                                      X = A

          Where

          X -- The number of shares of Warrant Stock to be issued to the
               Registered Holder.

          Y -- The number of shares of Warrant Stock as to which this Warrant is
               being exercised.

          A -- The fair market value of one share of the Company's Common Stock.

          B -- The Exercise Price (as adjusted to the date of such
               calculations).

          For purposes of this Section 1(f), the fair market value of Common
Stock shall mean the average of the closing sale prices of the Common Stock
quoted on the Nasdaq Stock Market or the average of the high and low prices
reported in the consolidated reporting system if the Common Stock is traded on
any exchange, or the average of the bid and asked prices of the Common Stock on
such other over-the-counter market in which the Common Stock may be traded,
whichever is applicable, for the ten (10) trading days prior to the date of
determination of fair market value (or such shorter period of time during which
such stock was traded over-the-

                                       5
<PAGE>

counter or on such exchange). If the Common Stock is not traded on the over-the-
counter market or on an exchange, the fair market value shall be the price per
share as shall be determined in good faith by the Company's Board of Directors.
The procedure for determination of the fair market value of the Common Stock as
described in this Section 1(f) is referred to as the "Fair Market Value
Procedure".

     2.   Adjustments.
          -----------

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

          (b)  Reclassification. In case of any reclassification or change of
               ----------------
the outstanding securities of the Company or of any reorganization of the
Company (or any other corporation the stock or securities of which are at the
time receivable upon the exercise of this Warrant) or any similar corporate
reorganization on or after the date hereof, then and in each such case, as a
condition to such reclassification, change or reorganization, the holder of this
Warrant, upon the exercise hereof at any time after the consummation of such
reclassification, change, reorganization, merger or conveyance, shall be
entitled to receive, in lieu of the stock or other securities and property
receivable upon the exercise hereof prior to such consummation, the stock or
other securities or property to which such holder would have been entitled upon
such consummation if such holder had exercised this Warrant immediately prior
thereto, all subject to further adjustment as provided in Section 2(a) and
provided the aggregate Purchase Price payable for the total number of Warrant
Stock purchasable under the Warrant (as adjusted) shall remain the same; and in
each such case, the terms of this Section 2 shall be applicable to the shares of
stock or other securities properly receivable upon the exercise of this Warrant
after such consummation.

          (c)  Adjustment for Capital Reorganization, Merger or Consolidation.
               --------------------------------------------------------------
In case of any capital reorganization of the capital stock of the Company (other
than a combination, reclassification, exchange or subdivision of shares
otherwise provided for in this Section 2), or any merger or consolidation of the
Company with or into another corporation, or the sale of all or substantially
all the assets of the Company, then, and in each such case, as a condition of
such reorganization, merger, consolidation, sale or transfer, lawful provision
shall be made (and duly

                                       6
<PAGE>

executed documents evidencing the same shall be delivered to the Registered
Holders) so that the Registered Holder of this Warrant shall thereafter be
entitled to receive upon exercise of this Warrant, during the period specified
herein and upon payment of the Purchase Price then in effect, the number of
shares of stock or other securities or property of the successor corporation
resulting from such reorganization, merger, consolidation, sale or transfer that
a holder of the shares deliverable upon exercise of this Warrant would have been
entitled to receive in such reorganization, consolidation, merger, sale or
transfer if this Warrant had been exercised immediately before such
reorganization, merger, consolidation, sale or transfer, all subject to further
adjustment as provided in this Section 2. The foregoing provisions of this
Section 2(c) shall similarly apply to successive reorganizations,
consolidations, mergers, sales and transfers and to the stock or securities of
any other corporation that are at the time receivable upon the exercise of this
Warrant. If the per-share consideration payable to the Registered Holder hereof
for shares in connection with any such transaction is in a form other than cash
or marketable securities, then the value of such consideration shall be
determined in good faith by the Company's Board of Directors. In all events,
appropriate adjustment (as determined in good faith by the Company's Board of
Directors) shall be made in the application of the provisions of this Warrant
with respect to the rights and interests of the Registered Holder after the
transaction, to the end that the provisions of this Warrant shall be applicable
after that event, as near as reasonably may be, in relation to any shares or
other property deliverable after that event upon exercise of this Warrant.

          (d)  Adjustment Certificate. When any adjustment is required to be
               ----------------------
made in the Warrant Stock or the Purchase Price pursuant to this Section 2, the
Company shall promptly (but in any event within 10 days) mail to the Registered
Holder a certificate setting forth (i) a brief statement of the facts requiring
such adjustment, (ii) the Purchase Price after such adjustment and (iii) the
kind and amount of stock or other securities or property into which this Warrant
shall be exercisable after such adjustment.

          (e)  Penalty. In the event that the AC Entities do not generate at
               -------
least $40 million of Qualifying Revenue prior to the fourth anniversary of the
Date of Issuance, then the Registered Holder shall pay to the Company $700,000
(the "Penalty").

     3.   Transfers.
          ---------

          (a)  Unregistered Security. Each holder of this Warrant acknowledges
               ---------------------
that this Warrant and the Warrant Stock have not been registered under the
Securities Act of 1933, as amended (the "Securities Act"), and agrees not to
sell, pledge, distribute, offer for sale, transfer or otherwise dispose of this
Warrant or any Warrant Stock issued upon its exercise in the absence of (i) an
effective registration statement under the Securities Act as to this Warrant or
such Warrant Stock and registration or qualification of this Warrant or such
Warrant Stock under any applicable U.S. federal or state securities law then in
effect or (ii) unless the transfer is pursuant to Rule 144(k), compliance with
which has been determined to the reasonable satisfaction of the Company, or an
opinion of counsel, satisfactory to the Company, that such registration and
qualification are not required. Each certificate or other instrument for Warrant
Stock issued upon the exercise of this Warrant shall bear a legend substantially
to the foregoing effect.

                                       7
<PAGE>

          (b)  Transferability. Subject to the provisions of Section 3(a) hereof
               ---------------
this Warrant and all rights hereunder are transferable, in whole or in part,
upon surrender of the Warrant with a properly executed assignment (in the form
of Exhibit C hereto) at the principal office of the Company.

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

          (d)  Market Stand-Off Agreement.
               --------------------------

               (i)  Without the express prior written consent of the Company's
                    Board of Directors, a Registered Holder shall not, directly
                    or indirectly, offer, sell, pledge, contract to sell
                    (including any short sale), grant any option to purchase or
                    otherwise dispose of this Warrant, any Warrant Stock, or any
                    Common Stock or other securities of the Company held by it
                    or enter into any Hedging Transaction (as defined below)
                    relating to any securities of the Company until 360 days
                    after the effective date of the registration statement for
                    the Company's initial public offering (its "IPO"). For
                    purposes of this Section 3(d), "Hedging Transaction" means
                    any short sale (whether or not against the box) or any
                    purchase, sale or grant of any right (including without
                    limitation, any put or call option) with respect to any
                    security (other than a broad-based market basket or index)
                    that includes, relates to or derives any significant part of
                    its value from the Company's Common Stock. The limitation of
                    this Section 3(d) with respect to pledges of Common Stock
                    shall not apply to a pledge, on or after April 10, 2001, by
                    a stockholder who acquires Common Stock upon exercise of
                    options granted as compensation for services if and to the
                    extent that such pledge serves as security for a loan to the
                    stockholder to satisfy his income tax liabilities arising
                    from such exercise; provided, however, that the pledgee of
                    such security shall enter into a written agreement binding
                    it to each of the pledgor's obligations hereunder with
                    respect to such pledged Common Stock.

               (ii) Notwithstanding anything to the contrary in any agreement
                    between any party hereto and the Company, Registered Holder
                    further agrees that, if the Company's stockholders, prior to
                    the end of the period set forth in Section 3(d)(i), sell (i)
                    a material amount of Common Stock on an arm's-length basis
                    to third parties in one or more private transactions, or
                    (ii) any Common Stock in a

                                       8
<PAGE>

                     registered public offering, Registered Holder and other
                     eligible stockholders of the Company shall be offered the
                     opportunity to participate in such sale on the same terms
                     and in an amount proportional to all other stockholders of
                     the Company based on their respective then-current
                     percentage fully-diluted ownership of Common Stock. For
                     example, if eligible stockholders of the Company (including
                     Investor) could sell an aggregate of 100,000 shares in such
                     a transaction, and the participating stockholders have an
                     aggregate 50% fully-diluted ownership interest in the
                     Company, a participating stockholder with a 10% interest
                     could sell 20,000 shares [10%/50% x 100,000 = 20,000] in
                     such transaction. Notwithstanding the general provisions of
                     the first sentence of this Section 3(d)(ii), any eligible
                     stockholder's (including Registered Holder's) participation
                     in any such transaction is subject to (x) such limitations
                     as may be imposed in good faith by the managing underwriter
                     of the public offering or (y) possible reduction to permit
                     such additional participation by parties as shall be
                     determined by the Company's Board of Directors to be in the
                     Company's best interests in light of its bona fide business
                     considerations. Any transaction complying with the first
                     sentence of this Section 3(d)(ii) shall be automatically
                     deemed to have been consented to by the Company's Board of
                     Directors for purposes of Section 3(d)(i). Any Company
                     stockholder or optionholder that has entered or
                     subsequently enters into a separate agreement with the
                     Company that contains a provision equivalent to this
                     Section 3(d) shall be considered an eligible stockholder of
                     the Company under this Warrant for purposes of determining
                     such holder's proportional participation in any
                     contemplated sale pursuant to this Section 3(d)(ii).

               (iii) In addition to the restrictions contained in Section
                     3(d)(i), in connection with any public offering of the
                     Company's Common Stock after its IPO, Registered Holder, if
                     requested in good faith by the Company and the managing
                     underwriter of the Company's securities, shall further
                     agree not to directly or indirectly, offer, sell, pledge,
                     contract to sell (including any short sale), grant any
                     option to purchase or otherwise dispose of this Warrant,
                     any Warrant Stock or any Common Stock or other securities
                     of the Company held by it or enter into any Hedging
                     Transaction relating to any securities of the Company until
                     90 days after the effective date of the registration
                     statement for such public offering or such earlier date as
                     shall be agreed to by such managing underwriter.

               (iv)  Registered Holder may distribute a portion of the rights to
                     purchase Warrant Stock under this Warrant, Warrant Stock or
                     Common Stock to its equity holders prior to and in
                     connection with any public offering of Common Stock, but
                     only if each such

                                       9
<PAGE>

                    equity holder enters into a written agreement binding it to
                    Registered Holder's obligations hereunder. The Company's
                    Board of Directors may also approve similar transfers to
                    Registered Holder's affiliates and other related parties on
                    a case by case basis, provided, however, that each such
                    transferee enters into a written agreement binding it to
                    Registered Holder's obligations hereunder. Thereafter, each
                    such distributee shall be deemed to be a Registered Holder
                    for purposes of this Section 3(d) with respect to the rights
                    to purchase Warrant Stock under this Warrant or Warrant
                    Stock so transferred or shares of Common Stock so
                    distributed.

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

          5.   Termination. This Warrant (and the right to purchase securities
               -----------
upon exercise hereof) shall terminate at 5:00 p.m. Central Time on the fourth
anniversary of the Date of Issuance. Following a Company Change in Control, the
Registered Holder shall have the right to terminate this Warrant upon written
notice to the Company given within 6 months of the Company Change of Control
and, as of the date of termination specified in such notice, this Warrant shall
terminate and be of no force and effect. Prior to the date of termination
specified in such notice, the Registered Holder shall have the right to exercise
this Warrant with respect to the Warrant Stock vested prior to the date of
termination.

          6.   Representations and Warranties. Except as set forth on Schedule
               ------------------------------
6, the Company hereby represents and warrants to Registered Holder as follows:

               (a)  Organization; Corporate Power. The Company is a corporation
                    -----------------------------
duly organized, validly existing and in good standing under the laws of
Delaware. The Company will have at the date of issuance of this Warrant ("Date
of Issuance") all requisite legal and corporate power to execute and deliver
this Warrant, to sell and issue the Warrant Stock upon exercise hereof in
accordance with the terms set forth herein, and to carry out and perform its
obligations under the terms of this Warrant.

               (b)  Authorization. All corporate action on the part of the
                    -------------
Company, its directors and stockholders necessary for the authorization,
execution, delivery and performance of this Warrant by the Company, the
authorization, sale, issuance and delivery of the Warrant Stock and the
performance of all of the Company's obligations under this Warrant has been
taken or will be taken prior to the Date of Issuance. This Warrant, when
executed and delivered by the Company, shall constitute a valid and binding
obligations of the Company enforceable against the Company in accordance with
its terms. The shares of Common Stock issuable upon conversion of the Warrant
have been duly and validly reserved and, when issued in compliance with the
provisions of this Warrant, will be validly issued, fully paid and
nonassessable, and such

                                       10
<PAGE>

Common Stock will be free of any liens or encumbrances other than those created
by or imposed upon the holders thereof through no action of the Company;
provided, however, that the Warrant Stock may be subject to restrictions on
transfer under this Warrant and under state and/or federal securities laws. The
Warrant Stock is not subject to any preemptive rights or rights of first
refusal.

     7.   Notices of Certain Transactions.
          -------------------------------

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

          (b)  Upon the earlier of the Company approving, entering into an
agreement for or consummating any capital reorganization of the Company, any
reclassification of the capital stock of the Company, any consolidation or
merger of the Company, any consolidation or merger of the Company with or into
another corporation (other than a consolidation or merger in which the Company
is the surviving entity and which does not result in any reclassification or
change in the outstanding securities issuable upon exercise of this Warrant), or
any transfer of all or substantially all of the assets of the Company (but in
any event not less than 10 days prior to a Company Change of Control), or

          (c)  Upon the earlier of the Company approving, entering into an
agreement for or consummating of the voluntary or involuntary dissolution,
liquidation or winding-up of the Company,

          (d)  then, and in each such case, the Company will cause to be
delivered by reputable overnight courier to the Registered Holder of this
Warrant a notice specifying, as the case may be, (i) the date on which a record
is to be taken for the purpose of such dividend, distribution or right, and
stating the amount and character of such dividend, distribution or right, or
(ii) the effective date on which such reorganization, reclassification,
consolidation, merger, transfer, dissolution, liquidation or winding-up is to
take place, and the time, if any is to be fixed, as of which the holders of
record of Warrant Stock (or such other stock or securities at the time
deliverable upon such reorganization, reclassification, consolidation, merger,
transfer, dissolution, liquidation or winding-up) are to be determined (but in
any event such notice shall be sent not less than 10 days prior to a Company
Change of Control), Such notice shall be sent at least ten days prior to the
record date or effective date for the event specified in such notice.

                                       11
<PAGE>

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

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

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

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

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

     13.  No Fractional Shares. No fractional shares of Warrant Stock will be
          --------------------
issued in connection with any exercise hereunder. In lieu of any fractional
shares which would otherwise be issuable, the Company shall pay cash equal to
the product of such fraction multiplied by the fair market value of one share of
Warrant Stock on the date of exercise, as determined pursuant to the Fair Market
Value Procedures.

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

                                       12
<PAGE>

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

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

     17.  Severability. If one or more provisions of this Warrant are held to be
          ------------
unenforceable under applicable law, such provision shall be excluded from this
Warrant and the balance of the Warrant shall be interpreted as if such provision
were so excluded and shall be enforceable in accordance with its terms.

                                        CLICK COMMERCE, INC.



                                        By: /s/ Michael W. Ferro, Jr.
                                            -------------------------------
                                            Michael W. Ferro, Jr.

                                        Title: Chief Executive Officer
                                        Address:  200 East Randolph Street
                                                  49th Floor
                                                  Chicago, IL  60601
                                                  Fax Number: (312) 482-8557

                                       13
<PAGE>

EXHIBIT A



                              NOTICE OF EXERCISE

                   (To be executed upon exercise of Warrant)

                             CLICK COMMERCE, INC.

                           Dated: __________________



          The undersigned hereby irrevocably elects to exercise the right of
purchase represented by the within Warrant for, and to purchase thereunder, the
securities of Click Commerce, Inc., as provided for therein, and tenders
herewith either (a) payment of the exercise price in full in the form of cash or
a certified or official bank check in same-day funds in the amount of
$____________________ for _________ such securities or (b) shares of common
stock of Click Commerce, Inc. pursuant to Section 1(f) of the Warrant.

          Please issue a certificate or certificates for such securities in the
name of, and pay any cash for any fractional share to (please print name,
address and social security number):



          Name:

          Address:



          Signature:

Note:     The above signature should correspond exactly with the name on the
          first page of this Warrant or with the name of the assignee appearing
          in the assignment form below.

          If said number of shares shall not be all the shares purchasable under
the within Warrant, a new Warrant is to be issued in the name of said
undersigned for the balance remaining of the shares purchasable thereunder
rounded up to the next higher whole number of shares.
<PAGE>

EXHIBIT B

              Form of Stockholder and Investor Joinder Agreement
              --------------------------------------------------

          Undersigned hereby agrees, effective as of April 20th, 2000, to become
a party to that certain Amended and Restated Stockholders and Rights Agreement
(the "Agreement"), dated as of July 9, 1999, by and among Click Commerce Inc.
(formerly known as Click Interactive, Inc.) and the other parties named therein,
and for all purposes of the Agreement, undersigned shall be included within the
term "Investor" and "Stockholder" (each as defined in the Agreement). The
address and facsimile number to which notices may be sent to undersigned is as
set forth below:

                                        AC Ventures B.V



                                        By:__________________________________
                                        Name:________________________________
                                        Title:_______________________________
                                        Address: c/o Anderson Consulting, LLP
                                                 1661 Page Mill Road
                                                 Palo Alto, California   94304
                                        Fax:
<PAGE>

EXHIBIT C



                                ASSIGNMENT FORM



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

          Name of Assignee      Address/Fax Number     No. of Shares






          Dated:_________________     Signature: ___________________




          Witness:  __________________________