Document:

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                                                                   EXHIBIT 10.19

                   SERIES B PREFERRED STOCK PURCHASE WARRANT

THIS WARRANT HAS BEEN, AND THE SHARES OF SERIES B PREFERRED STOCK WHICH MAY BE
PURCHASED PURSUANT TO THE EXERCISE OF THIS WARRANT (THE "SHARES"), WILL BE
ACQUIRED SOLELY FOR INVESTMENT AND NOT WITH A VIEW TO, OR FOR RESALE IN
CONNECTION WITH, ANY DISTRIBUTION THEREOF.  NEITHER THIS WARRANT NOR THE SHARES
OF SERIES B PREFERRED STOCK ISSUABLE HEREUNDER OR ANY SHARES INTO WHICH SUCH
SHARES ARE CONVERTIBLE, (TOGETHER, THE "SECURITIES") HAVE BEEN REGISTERED UNDER
THE SECURITIES ACT OF 1933, AS AMENDED (THE "ACT"), OR ANY STATE SECURITIES
LAWS.  SUCH SECURITIES MAY NOT BE SOLD, OFFERED FOR SALE, PLEDGED OR
HYPOTHECATED IN THE ABSENCE OF SUCH REGISTRATION OR AN OPINION OF COUNSEL
SATISFACTORY TO THE COMPANY AND ITS COUNSEL THAT SUCH DISPOSITION IS EXEMPT FROM
THE REGISTRATION AND PROSPECTUS DELIVERY REQUIREMENTS OF THE ACT AND OF ANY
APPLICABLE STATE SECURITIES LAWS.

No. 6
                                                       Void after March 11, 2008

                               2BRIDGE SOFTWARE

            WARRANT TO PURCHASE SHARES OF SERIES B PREFERRED STOCK
                                 _____________

     THIS CERTIFIES THAT, for value received, Comdisco, Inc. (the "Holder") is
entitled to subscribe for and purchase from 2Bridge Software, a California
corporation (the "Company"), shares of the Company's fully paid and
nonassessable Series B Preferred Stock (the "Shares"), in the amounts and at the
price per share set forth in Section 1 below (as adjusted pursuant to Section 4
hereof), subject to the provisions and upon the terms and conditions hereinafter
set forth.

     This Warrant is subject to the following terms and conditions:

     1.   Number and Price of Shares.
          --------------------------

          (a)  The Holder shall have the right to purchase a number of Shares
equal to sixty-two thousand five hundred dollars ($62,500), or 5% of the
$1,250,000 principal amount of the Note by and between the Company and the
Holder, divided by the Exercise Price, as defined in Section 1(b) below.

          (b)  The exercise price per Share ("Exercise Price") shall be equal
to: (i) the price at which the Company sells the Shares in an equity financing
completed on or before July 11, 1998, or (ii) if such a financing is not
completed by July 11, 1998, the average of the price at which the Company sells
the Shares and the original issue price of the Series A Preferred Stock of
$.8718.
<PAGE>

          (c)  An example of this formula is as follows:  if the Company
completes a Series B Preferred Stock financing at $1.75 per share, the number
and Exercise Price of the Shares would be:

               (i)   $62,500/ $1.75 = 35,714 Shares, exercisable at $1.75 per
share, if the financing is completed within 120 days of the date of this
Warrant; or

               (ii)  $62,500/ ((1.75+ .8718)/2) = 62,500/ $1.3109 = 47,677
Shares, exercisable at $1.3109 per share, if the financing is completed more
than 120 days after the date of this Warrant.

          (d)  In the event the Company does not complete a round of Preferred
Stock financing within 180 days of the date of this Warrant, this Warrant shall
be exercisable for shares of the Company's Series A Preferred Stock, and all
references to the Shares and the Series B Preferred Stock herein shall mean the
Series A Preferred Stock of the Company.  The Exercise Price shall be $.8718 for
any Series A Preferred Stock issued hereunder.

     2.   Method of Exercise; Payment.
          ---------------------------

          (a)  Cash Exercise.  The purchase rights represented by this Warrant
               -------------
may be exercised by the Holder, in whole or in part, from time to time by: (i)
the surrender of this Warrant (with the notice of exercise form (the "Notice of
Exercise") attached hereto as Exhibit A duly executed) at the principal office
                              ---------
of the Company; (ii) the execution of a Series B Preferred Stock Purchase
Agreement and all exhibits thereto, including without limitation an Amended and
Restated Investor Rights Agreement, Voting Agreement, and Co-Sale Agreement
(collectively, the "Series B Transaction Documents"); and (iii)  by the payment
to the Company of an amount equal to the Exercise Price multiplied by the number
of the Shares being purchased, which amount may be paid, at the election of the
Holder, by wire transfer or certified check payable to the order of the Company.
The person or persons in whose name(s) any certificate(s) representing Shares
shall be issuable upon exercise of this Warrant shall be deemed to have become
the holder(s) of record of, and shall be treated for all purposes as the record
holder(s) of, the Shares represented thereby (and such Shares shall be deemed to
have been issued) immediately prior to the close of business on the date or
dates upon which this Warrant is exercised.

          (b)  Net Issue Exercise.  In lieu of exercising this Warrant pursuant
               ------------------
to Section 2(a) hereof, the Holder may elect to receive a number of Shares equal
to the value (as determined below) of this Warrant (or the portion thereof being
canceled) by surrender of this Warrant and the fully executed Series B
Transaction Documents at the principal office of the Company, together with the
Notice of Exercise in which alternative No. 1 is initiated by the Holder.  In
such event, the Company shall issue to the Holder a number of Shares computed
using the following formula:

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

                                       2
<PAGE>

Where X   =    the number of Shares to be issued to the Holder.

      Y   =    the number of Shares subject to this warrant.

      A   =    the fair market value of one share of the Company's Series B
               Preferred Stock.

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

          (c)  Fair Market Value.  For purposes of this Section 2, the fair
               -----------------
market value of the Company's Series B Preferred Stock shall mean:

               (i)   The average of the closing bid and asked prices of the
Company's Common Stock quoted in the Over-The-Counter Market Summary or the
closing price quoted on any exchange on which the Common Stock is listed,
whichever is applicable, as published in the Western Edition of The Wall Street
                                                                ---------------
Journal for the ten trading days prior to the date of determination of fair
-------
market value multiplied by the number of shares of Common Stock into which each
share of Series B Preferred Stock is convertible;

               (ii)  If the Company's Common Stock is not traded Over-The-
Counter or on an exchange, the fair market value of the Series B Preferred Stock
per share shall be the price per share which the Company could obtain from a
willing buyer for shares sold by the Company from authorized but unissued shares
of Series B Preferred Stock as such price shall be agreed by the parties hereto,
or if agreement cannot be reached within five (5) business days of delivery of
the notice pursuant to Section 2(b) hereof, as shall be determined by a panel of
appraisers. One appraiser shall be selected by the Holder, one appraiser shall
be chosen by the Company and the third appraiser shall be chosen by the first
two appraisers. If the appraisers cannot reach agreement as to the fair market
value on the foregoing basis on or before the thirtieth (30th) day following the
Holder's notice of election pursuant to Section 2(b), then each appraiser shall
deliver its appraisal and the appraisal which is neither the highest nor the
lowest shall be the fair market value of a share of Series B Preferred Stock. In
the event that the Holder fails to choose an appraiser or the three appraisers
fail to deliver an appraisal on or before the thirtieth (30th) day after such
notice, the appraisal of the appraiser selected by the Company shall control and
shall be fair market value for the purposes of this Warrant. The cost of the
appraiser selected by each party shall be borne by that party and the cost of
the third appraiser shall be borne one-half (1/2) by each party. Appraisers
selected under this Section 2(c) must be unaffiliated with the Holder and the
Company and must have reasonable professional qualifications for the appraisal.

          (d)  Stock Certificates.  In the event of any exercise of the rights
               ------------------
represented by this Warrant, certificates for the Shares so purchased shall be
delivered to the Holder within a reasonable time and, unless this Warrant has
been fully exercised or has expired, a new Warrant representing the Shares with
respect to which this Warrant shall not have been exercised shall also be issued
to the Holder within such time.

                                       3
<PAGE>

          (e)  Condition of Exercise  Unless exercised pursuant to an effective
               ---------------------
registration statement under the Act which includes the Shares so exercised, it
shall be a condition to any exercise of this Warrant that the Company shall have
received, at the time of such exercise, a representation in writing from the
Holder in the form attached hereto as Exhibit A-1, that the Shares being issued
                                      -----------
upon exercise are being acquired for investment and not with a view to any sale
or distribution thereof.

     3.   Stock Fully Paid; Reservation of Shares.  All of the Shares issuable
          ---------------------------------------
upon the exercise of the rights represented by this Warrant will, upon issuance
and receipt of the Exercise Price therefor, be fully paid and nonassessable, and
free from all preemptive rights, rights of first refusal or first offer, taxes,
liens and charges with respect to the issuance thereof.  During the period
within which the rights represented by this Warrant may be exercised, the
Company shall at all times have authorized and reserved for issuance sufficient
shares of its Series B Preferred Stock and Common Stock to provide for the
exercise of the rights represented by this Warrant.

     4.   Adjustment of Exercise Price and Number of Shares.  The number and
          -------------------------------------------------
kind of Shares purchasable upon the exercise of this Warrant and the Exercise
Price therefor shall be subject to adjustment from time to time upon the
occurrence of certain events, as follows:

          (a)  Stock Splits, Dividends and Combinations.  In the event that the
               ----------------------------------------
Company shall at any time subdivide the outstanding shares of Series B Preferred
Stock, or shall issue a stock dividend on its outstanding shares of Series B
Preferred Stock, the number of Shares issuable upon exercise of this Warrant
immediately prior to such subdivision or to the issuance of such stock dividend
shall be proportionately increased, and the Exercise Price shall be
proportionately decreased, and in the event that the Company shall at any time
combine the outstanding shares of Series B Preferred Stock, the number of Shares
issuable upon exercise of this Warrant immediately prior to such combination
shall be proportionately decreased, and the Exercise Price shall be
proportionately increased, effective at the close of business on the date of
such subdivision, stock dividend or combination, as the case may be.

          (b)  Price Adjustments. If at any time the Company issues or sells any
               -----------------
shares of its Preferred Stock for a consideration per share less than the then
effective Exercise Price, then and in each such case, the Exercise Price for the
Shares will be reduced to a price (calculated to the nearest cent) determined by
multiplying such applicable Exercise Price by a fraction (a) the numerator of
which will be the number of shares of Preferred Stock outstanding (or so deemed)
immediately prior to such issuance or sale plus the number of shares of Series B
Preferred Stock which the aggregate consideration received by the Company for
such issuance or sale would purchase at such applicable Exercise Price, and (b)
the denominator of which will be the number of shares of Preferred Stock
outstanding (or so deemed) immediately after the Preferred Stock proposed to be
issued or sold is issued or sold; provided that such fraction will in no event
be greater than one (1).  For purposes of this Section 4(b), the Shares will be
deemed to be outstanding on the date hereof.

                                       4
<PAGE>

          For the purpose of making any adjustment in the Exercise Price as
provided above, the consideration received by the Company for any issuance or
sale of Preferred Stock will be computed:

                    (A)  to the extent it consists of cash, as the amount of
cash received by the Company before deduction of any offering expenses payable
by the Company and any underwriting or similar commissions, compensation, or
concessions paid or allowed by the Company in connection with such issuance or
sale;

                    (B)  to the extent it consists of property other than cash,
at the fair market value of that property as determined in good faith by the
Company's Board of Directors; and

                    (C)  if Preferred Stock is issued or sold together with
other stock or securities or other assets of the Company for a consideration
which covers both, as the portion of the consideration so received that may be
reasonably determined in good faith by the Board of Directors to be allocable to
such Preferred Stock.

          No adjustment to the Exercise Price pursuant to this Section 4(b)
shall affect the number of Warrants to be issued pursuant to Section 1(a)
herein.

          (c)  Recapitalizations.  If at any time or from time to time there
               -----------------
shall be a recapitalization of the Series B Preferred Stock (other than a
subdivision, combination or merger or sale of assets transaction provided for
elsewhere in this Section 4), provision shall be made so that the Holder of this
Warrant will thereafter be entitled to receive upon exercise of this Warrant the
number of shares of stock or other securities or property of the Company to
which a Holder of Series B Preferred Stock would have been entitled on such
recapitalization.  In any such case, appropriate adjustment shall be made in the
application of the provisions of this Section 4 with respect to the rights of
the Holder of this Warrant after the recapitalization to the end that the
provisions of this Section 4 (including adjustment of the Exercise Price then in
effect and the number of shares issuable upon exercise of this Warrant) shall be
applicable after that event in as nearly an equivalent manner as may be
practicable.

          (d)  Merger. If at any time there shall be a capital reorganization of
               ------
the shares of the Company's stock (other than a combination, reclassification,
exchange or subdivision of shares otherwise provided for herein), or a merger or
consolidation of the Company with or into another corporation, whether or not
the Company is the surviving corporation, other than as provided for in Section
10(a) herein (a "Merger Event"), then as a part of such Merger Event, lawful
provision shall be made so that the Holder shall thereafter be entitled to
receive, upon exercise of the Warrant, the number of shares of stock or other
securities of the successor corporation resulting from such Merger Event,
equivalent in value to that which would have been issuable if Holder had
exercised this Warrant immediately prior to the Merger Event.  In any such case,
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 interest of the Holder after the Merger

                                       5
<PAGE>

Event to the end that the provisions of this Warrant (including adjustments of
the Exercise Price and number of Shares purchasable) shall be applicable to the
greatest extent possible.

          (e)  Notices.  Upon any adjustment of the Exercise Price and any
               -------
increase or decrease in the number of Shares purchasable upon the exercise of
this Warrant in accordance with Section 3 hereof, then, and in each such case,
the Company, within thirty (30) days thereafter, shall give written notice
thereof to the Holder at the address of such Holder as shown on the books of the
Company which notice shall state the Exercise Price as adjusted and, if
applicable, the increased or decreased number of Shares purchasable upon the
exercise of this Warrant, setting forth in reasonable detail the method of
calculation of each.   Any written notice by the Company required or permitted
hereunder shall be given by hand delivery or first class mail, postage prepaid,
addressed to the Holder at the address shown on the books of the Company for the
Holder.

     5.   Restrictions on Transfer.
          ------------------------

          (a)  Holder agrees not to make any disposition of all or any portion
of the Shares or the Warrant unless and until:

               (i)   There is then in effect a registration statement under the
1933 Act covering such proposed disposition and such disposition is made in
accordance with such registration statement; or

               (ii)  Holder shall have notified the Company of the proposed
disposition and shall have furnished the Company with a detailed statement of
the circumstances surrounding the proposed disposition, and the transferee has
agreed in writing to be bound by this Section 5. If reasonably requested by the
Company, Holder shall furnish the Company with an opinion of counsel, reasonably
satisfactory to the Company, that such disposition will not require registration
of such shares under the 1933 Act. Notwithstanding the foregoing, the
restrictions imposed upon the transferability of any of the Shares or rights to
acquire Shares do not apply to transfers from the beneficial owner of any of the
aforementioned securities to its nominee or from such nominee to its beneficial
owners, and shall terminate as to any particular Shares when a letter shall have
been issued to Holder at its request by the staff of the Securities and Exchange
Commission or a ruling shall have been issued to the Holder at its request by
such Commission stating that no action shall be recommended by such staff or
taken by such Commission, as the case may be, if such security is transferred
without registration under the 1933 Act in accordance with the conditions set
forth in such letter or ruling and such letter or ruling specifies that no
subsequent restrictions on transfer are required. It is agreed that the Company
will not require opinions of counsel for transactions made pursuant to Rule 144
except in unusual circumstances.

          (b)  Notwithstanding the above, the Shares shall also be subject to
all restrictions on transfer set forth in the Series B Transaction Documents,
including without limitation a 180 day market standoff period upon the Company's
initial public offering.

                                       6
<PAGE>

     6.   Fractional Shares.  No fractional shares of Common Stock will be
          -----------------
issued in connection with any exercise hereunder, but in lieu of such fractional
shares the Company shall make a cash payment therefor upon the basis of the
Exercise Price then in effect.

     7.   Representations and Warranties by the Company.
          ---------------------------------------------

          (a)  Due Authority.  The execution and delivery by the Company of this
               -------------
Warrant and the performance of all obligations of the Company hereunder,
including the issuance to Holder of the right to acquire Shares, have been duly
authorized by all necessary corporate action on the part of the Company.  This
Warrant is consistent with the Company's Amended and Restated Articles of
Incorporation, and does not contravene any law or governmental rule, regulation
or order applicable to it, and does not and will not contravene any provision
of, or constitute a default under, any indenture, mortgage, contract or other
instrument to which it is a party or by which it is bound.  This Warrant
constitutes a legal, valid and binding agreement of the Company, enforceable in
accordance with its respective terms.

          (b)  Consents and Approvals.  No consent or approval of, giving of
               ----------------------
notice to, registration with, or taking of any other action in respect of any
state, Federal or other governmental authority or agency is required with
respect to the execution, delivery and performance by the Company of its
obligations under this Warrant, except for the filing of notices pursuant to
Regulation D under the 1933 Act and any filing required by applicable state
securities law, which filings shall be made by the time required thereby.

          (c)  Holder's Additional Rights.  The Series B Preferred Stock shall
               --------------------------
have anti-dilution rights, registration rights, and information rights
substantially similar to those rights given to holders of the Company's Series A
Preferred Stock, which rights shall be set forth in the Series B Transaction
Documents.

          (d)  Other Commitments to Register Securities.  Except as set forth
               ----------------------------------------
herein and in the Investor Rights Agreement dated as of January 17, 1997 and the
Warrants issued to Holder as of November __, 1997 and the date hereof, the
Company is not, pursuant to the terms of any other agreement currently in
existence, under any obligation to register under the Securities Act any of its
presently outstanding securities or any of its securities which may hereafter be
issued.

          (e)  Exempt Transaction.  Subject to the accuracy of the Holder's
               ------------------
representations in this Section 11 and any filing necessary to obtain a state
securities law exemption, the issuance of Shares upon exercise of this Warrant
will constitute a transaction exempt from (i) the registration requirements of
Section 5 of the Securities Act, and (ii) the qualification requirements of the
applicable state securities laws.

          (f)  Compliance with Rule 144.  At the written request of Holder, who
               ------------------------
proposes to sell Warrant Shares issuable upon the exercise of this Warrant in
compliance with Rule 144 promulgated by the Securities and Exchange Commission,
the Company shall furnish to Holder, within ten (10) days after receipt of such
request, a written statement confirming the Company's

                                       7
<PAGE>

compliance with the filing requirements of the Securities and Exchange
Commission as set forth in such Rule, as such Rule may be amended from time to
time.

          (g)  The Company agrees to take all actions necessary to issue the
Series A Preferred Stock described in Section 1(d) herein if the Company has not
completed a Preferred Stock financing within 180 days of the date of this
Warrant, including without limitation obtaining all shareholder and director
consents, amending the Company's Articles of Incorporation, and amending any
Series A Preferred Stock transaction documents required to effect such issuance
to Holder.

     8.   Representations and Warranties by the Holder.  Holder represents and
          --------------------------------------------
warrants to the Company as follows:

          (a)  Holder understands that no Series B Preferred Stock has been
authorized or issued as of the date hereof, and the Company can make no
assurances that such security will ever exist.

          (b)  This Warrant is being acquired for Holder's own account, for
investment and not with a view to, or for resale in connection with, any
distribution or public offering thereof within the meaning of the Act, and the
Holder has no present intention of selling or engaging in any public
distribution thereof pursuant to a registration or exemption.

          (c)  Holder understands that the Warrant and the Shares have not been
registered under the Act by reason of their issuance in a transaction exempt
from the registration and prospectus delivery requirements of the Act pursuant
to Section 4(2) thereof, and that they must be held by Holder indefinitely, and
that Holder must therefore bear the economic risk of such investment
indefinitely, unless a subsequent disposition thereof is registered under the
Act or is exempted from such registration.  The Holder further understands that
the Shares have not been qualified under the California Securities Law of 1968
(the "California Law") by reason of their issuance in a transaction exempt from
the qualification requirements of the California Law pursuant to Section
25102(f) thereof, which exemption depends upon, among other things, the bona
fide nature of the Holder's investment intent expressed above.

          (d)  The Holder has such knowledge and experience in financial and
business matters that it is capable of evaluating the merits and risks of the
purchase of this Warrant and the Shares purchasable pursuant to the terms of
this Warrant and of protecting its interests in connection therewith.

          (e)  The Holder is able to bear the economic risk of the purchase of
the Shares pursuant to the terms of this Warrant.

     9.   Rights of Stockholders.  Nothing contained herein shall confer upon
          ----------------------
Holder any of the rights of a stockholder of the Company or any right to vote
for the election of directors or upon any matter submitted to stockholders at
any meeting thereof, or to give or withhold consent to any corporate action
(whether upon any recapitalization, issuance of stock, reclassification of
stock,

                                       8
<PAGE>

change of par value, consolidation, merger, conveyance, or otherwise) or to
receive notice of meetings, or to receive dividends or subscription rights or
otherwise until the Warrant shall have been exercised and the Shares purchasable
upon the exercise hereof shall have become deliverable, as provided herein.

     10.  Expiration of Warrant.
          ---------------------

          (a)  This Warrant shall expire and shall no longer be exercisable as
of the earlier of:

               (i)    5:00 p.m., California local time, on March 11, 2008;

               (ii)   five (5) years after the Company's initial public offering
under the Securities Act of 1933, as amended;

               (iii)  the automatic conversion of the Series B Preferred Stock
of the Company into Common Stock of the Company, according to the terms of the
Series B Transaction Documents, provided that Company provides Holder with at
least thirty (30) days notice of such automatic conversion and that it gives
Holder an option in Holder's sole discretion to either exercise the Warrant or
cause Company to replace the Warrant with a Warrant to Purchase Common Stock on
substantially the same terms as those set forth herein;

               (iv)   a consolidation or merger of the Company with or into
another corporation (other than a consolidation or merger with another
corporation in which the Company's stockholders immediately preceding such
consolidation or merger own at least 50% of the voting securities of the
successor entity following such consolidation or merger and which does not
result in any reclassification of the Shares issuable upon exercise of this
Warrant); or

               (v)    a sale of all or substantially all of the assets of the
Company.

     11.  Miscellaneous.
          -------------

          (a)  This Warrant is being delivered in the State of California and
shall be construed and enforced in accordance with and governed by the laws of
such State.  The parties expressly stipulate that any litigation under this
Warrant shall be brought in the State courts of the Counties of Santa Clara or
San Francisco, California and in the United States District Court for the
Northern District of California.  The parties agree to submit to the
jurisdiction and venue of those courts.  Notwithstanding the foregoing, any
claim or dispute involving questions of usury law as it applies to the Warrant
shall be governed by the laws of Illinois.

          (b)  The headings in this Warrant are for purposes of reference only,
and shall not limit or otherwise affect any of the terms hereof.

                                       9
<PAGE>

          (c)  The terms of this Warrant shall be binding upon and shall inure
to the benefit of any successors in interest of the Company or the Holder. This
Warrant and all rights hereunder are not assignable or transferable by Company
or Holder, except for such permitted transfers to successors in interest and in
accordance with Section 5 herein, and any attempt to assign or transfer the
rights hereunder shall be void and of no further effect.

          (d)  This Warrant and the other documents delivered pursuant hereto,
including without limitation the Series B Transaction Documents, constitute the
full and entire understanding and agreement between the parties with regard to
the subjects hereof and thereof.

          (e)  The Company shall not, by amendment of its Amended and Restated
Articles of Incorporation, or through any other means, directly or indirectly,
avoid or seek to avoid the observance or performance of any of the terms of this
Warrant and shall 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.

          (f)  Upon receipt of evidence reasonably satisfactory to the Company
of the loss, theft, destruction or mutilation of this Warrant and, in the case
of any such loss, theft or destruction, upon delivery of an indemnity agreement
reasonably satisfactory in form and amount to the Company or, in the case of any
such mutilation, upon surrender and cancellation of such Warrant, the Company at
its expense will execute and deliver to the holder of record, in lieu thereof, a
new Warrant of like date and tenor.

          (g)  This Warrant and any provision hereof may be amended, waived or
terminated only by an instrument in writing signed by the Company and Holder.

     IN WITNESS WHEREOF, the Company has caused this Warrant to be signed by its
duly authorized officer.

     Issued this 11th day of March, 1998.

                                             2BRIDGE SOFTWARE

                                             By: /s/ Ronald Parks
                                                 -------------------------------
                                             Title:  CFO
                                                    ----------------------------

Acknowledged and Accepted:

COMDISCO, INC.

By: /s/ James P. Labe
   ------------------------------------------
        JAMES P. LABE

Title: PRESIDENT
      ---------------------------------------
       COMDISCO VENTURES DIVISION
                                       10
<PAGE>

                                   EXHIBIT A
                                   ---------
                              NOTICE OF EXERCISE
                              ------------------

TO:  2BRIDGE SOFTWARE
     Attention:  President

     1.   In lieu of exercising the attached Warrant for cash or check, the
undersigned hereby elects to effect the net issuance provision of Section 2(b)
of this Warrant and receive ____________ (leave blank if you choose Alternative
No. 2 below) shares of Series B Preferred Stock pursuant to the terms of this
Warrant. (Initial here if the undersigned elects this alternative).
___________.

     2.   The undersigned hereby elects to purchase _______________ (leave blank
if you choose alternative No. 1 above) shares of Series B Preferred Stock of
2Bridge Software pursuant to the terms of this Warrant, and tenders herewith
payment of the purchase price of such shares in full.

     3.   Please issue a certificate or certificates representing said shares of
Series B Preferred Stock in the name of the undersigned or in such other name as
is specified below:

                    _______________________________________
                                    (Name)

                    _______________________________________

                    _______________________________________
                                   (Address)

     4.   The undersigned hereby represents and warrants that the aforesaid
shares of Series B Preferred Stock are being acquired for the account of the
undersigned for investment and not with a view to, or for resale, in connection
with the distribution thereof, and that the undersigned has no present intention
of distributing or reselling such shares except pursuant to a registration or
exemption, and all representations and warranties of the undersigned set forth
in Section 8 of the attached Warrant are true and correct as of the date hereof.
In support thereof, the undersigned agrees to execute an Investment
Representation Statement in a form substantially similar to the form attached to
the Warrant as Exhibit A-1.
               -----------

                                           _____________________________________
                                           (Signature and Date)

                                           Title:_______________________________

<PAGE>

                                  EXHIBIT A-1
                                  -----------

                      INVESTMENT REPRESENTATION STATEMENT

PURCHASER      :    COMDISCO, INC.

COMPANY        :    2BRIDGE SOFTWARE

SECURITY       :    SERIES B PREFERRED STOCK ISSUED UPON EXERCISE OF THE SERIES
                    B PREFERRED STOCK PURCHASE WARRANT ISSUED ON MARCH _____,
                    1998

AMOUNT         :    _______________ SHARES

DATE           :    ___________________, ______

In connection with the purchase of the above-listed Securities, I, the
Purchaser, represent to the Company the following:

     (a)  I am aware of the Company's business affairs and financial condition,
and have acquired sufficient information about the Company to reach an informed
and knowledgeable decision to acquire the Securities.  I am purchasing these
Securities for my own account for investment purposes only and not with a view
to, or for the resale in connection with, any "distribution" thereof for
purposes of the Securities Act of 1933, as amended (the "Securities Act") except
pursuant to a registration of exemption.

     (b)  I understand that the Securities have not been registered under the
Securities Act in reliance upon a specific exemption therefrom, which exemption
depends upon, among other things, the bona fide nature of my investment intent
as expressed herein.  In this connection, I understand that, in the view of the
Securities and Exchange Commission (the "SEC"), the statutory basis for such
exemption may be unavailable if my representation was predicated solely upon a
present intention to hold these Securities for the minimum capital gains period
specified under tax statutes, for a deferred sale, for or until an increase or
decrease in the market price of the Securities, or for a period of one year or
any other fixed period in the future.

     (c)  I further understand that the Securities must be held indefinitely
unless subsequently registered under the Securities Act or unless an exemption
from registration is otherwise available. Moreover, I understand that the
Company is under no obligation to register the Securities.  In addition, I
understand that the certificate evidencing the Securities will be imprinted with
a legend which prohibits the transfer of the Securities unless they are
registered or such registration is not required in the opinion of counsel for
the Company.

     (d)  I am familiar with the provisions of Rule 144, promulgated under the
Securities Act, which, in substance, permits limited public resale of
"restricted securities" acquired, directly or
<PAGE>

indirectly, from the issuer thereof, in a non-public offering subject to the
satisfaction of certain conditions.

     The Securities may be resold in certain limited circumstances subject to
the provisions of Rule 144, which requires among other things: (1) the
availability of certain public information about the Company, (2) the resale
occurring not less than one year, and in some circumstances two years, after the
party has held, within the meaning of Rule 144, the securities to be sold; and,
in the case of an affiliate, or of a non-affiliate who has held the securities
less than two years, and in some circumstances three years, (3) the sale being
made through a broker in an unsolicited "broker's transaction" or in
transactions directly with a market maker (as said term is defined under the
Securities Exchange Act of 1934) and the amount of securities being sold during
any three month period not exceeding the specified limitations stated therein,
if applicable.

     (e)  I agree, in connection with the Company's initial underwritten public
offering of the Company's securities, (1) not to sell, make short sale of, loan,
grant any options for the purchase of, or otherwise dispose of any shares of
Common Stock of the Company held by me (other than those shares included in the
registration) without the prior written consent of the Company or the
underwriters managing such initial underwritten public offering of the Company's
securities for one hundred eighty (180) days from the effective date of such
registration, and (2) I further agree to execute any agreement reflecting (1)
above as may be requested by the underwriters at the time of the public
offering; provided however that the officers and directors of the Company who
          -------- -------
own the stock of the Company also agree to such restrictions.

     (f)  I further understand that in the event all of the applicable
requirements of Rule 144 are not satisfied, registration under the Securities
Act, compliance with Regulation A, or some other registration exemption will be
required; and that, notwithstanding the fact that Rule 144 is not exclusive, the
Staff of the SEC has expressed its opinion that persons proposing to sell
private placement securities other than in a registered offering and otherwise
than pursuant to Rule 144 will have a substantial burden of proof in
establishing that an exemption from registration is available for such offers or
sales, and that such persons and their respective brokers who participate in
such transactions do so at their own risk.

                                              __________________________________
                                              (Signature)

                                              By: ______________________________

                                              Title: ___________________________

                                              Date: ______________________, 19__

                                       2<PAGE>

                                                                   Exhibit 10.20

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

                           WARRANT TO PURCHASE STOCK

Corporation:             2Bridge Software, A California Corporation
Number of Shares:        85,221 (subject to Section 1.7)
Class of Stock:          Series B Preferred (subject to Section 1.7)
Initial Exercise Price:  $1.4081 per share (subject to Section 1.7)
Issue Date:              May 1, 1999
Expiration Date:         May 1, 2006 (Subject to Article 4.1)

     THIS WARRANT CERTIFIES THAT, in consideration of the payment of $1.00 and
for other good and valuable consideration, IMPERIAL BANCORP or its registered
assignee (together with its successors and assigns "Holder") is entitled to
purchase the number of fully paid and nonassessable shares of the class of
securities (the "Shares") of the corporation (together with its successors and
assigns, the "Company") at the initial exercise price per Share (the "Warrant
Price") all as set forth above and as adjusted pursuant to Article 2 of this
Warrant, subject to the provisions and upon the terms and conditions set forth
of this Warrant.

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

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

     1.2  Conversion Right. In lieu of exercising this Warrant as specified in
          ----------------
Section 1.1, Holder may from time to time convert this Warrant, in whole or in
part, into a number of Shares determined by dividing (a) the aggregate fair
market value of the Shares or other securities otherwise issuable upon exercise
of this Warrant minus the aggregate Warrant Price of such Shares by (b) the fair
market value of one Share. The fair market value of the Shares shall be
determined pursuant to Section 1.5.
<PAGE>

     1.3  Fair Market Value. If the Shares are traded regularly in a public
          -----------------
market, the fair market value of the Shares shall be the closing price of the
Shares (or the closing price of the Company's stock into which the Shares are
convertible) reported for the business day immediately before Holder delivers
its Notice of Exercise to the Company. If the Shares are not regularly traded in
a public market, the Board of Directors of the Company shall determine the fair
market value in its reasonable good faith judgment. The foregoing
notwithstanding, if Holder advises the Board of Directors in writing that Holder
disagrees with such determination, then the Company and Holder shall promptly
agree upon a reputable investment banking firm to undertake such valuation, if
the valuation of such investment banking firm is greater than five (5%) percent
or more than that determined by the Board of Directors, then all fees and
expenses of such investment banking firm shall be paid by the Company. In all
other circumstances, such fees and expenses shall be paid by Holder.

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

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

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

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

          1.6.2.  Assumption of Warrant. If upon the closing of any Acquisition
                  ---------------------
the successor entity assumes the obligations of this Warrant, then this Warrant
shall be exercisable for the same securities, cash, and property as would be
payable for the Shares issuable upon exercise of the Unexercised portion of this
Warrant as if such Shares were outstanding on the record date for the
Acquisition and subsequent closing. The Warrant Price shall be adjusted
accordingly. The Company shall use reasonable efforts to cause the surviving
corporation to assume the obligations of this Warrant.

          1.6.3.  Nonassumption. If upon the closing of any Acquisition the
                  -------------
successor entity does not assume the obligations of this Warrant and Holder has
not otherwise exercised this Warrant in full, then the unexercised portion of
this Warrant shall be deemed to have been automatically converted pursuant to
Section 1.2 and thereafter Holder shall participate in the Acquisition on the
same terms as other holders of the same class of securities of the Company.

                                       2
<PAGE>

     1.7  Adjustment in Underlying Preferred Stock Price and Exercise Price. If
          -----------------------------------------------------------------
on or before July 31, 1999, the Company sells and issues to any investors,
preferred stock with aggregate gross proceeds to the Company of at least
$6,000,000 (six million dollars), this Warrant shall concurrent with the
issuance of such shares of preferred stock automatically be adjusted to instead
be exercisable for shares of the same series and class and bearing the same
rights, preferences, and privileges, of such shares of stock, with the Warrant
Price hereunder adjusted to equal the per share purchase price of such stock,
and the number of such shares subject to this Warrant adjusted to equal (i) one
hundred twenty thousand dollars ($120,000)*, divided by (ii) such modified per
share Warrant Price.

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

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

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

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

     2.4  Adjustments for Diluting Issuances. The number of shares of common
          ----------------------------------
stock issuable upon conversion of the Shares issuable upon exercise of this
Warrant shall be subject to adjustment, from time to time, in the manner set
forth on Exhibit A, if attached, in the event of Diluting Issuances (as defined
on Exhibit A).

                                       3
<PAGE>

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

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

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

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

          (a) The initial Warrant Price referenced on the first page of this
Warrant is not greater than the fair market value of the Shares as of the date
of this Warrant.

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

     3.2  Notice of Certain Events. If the Company proposes at any time (a) to
          ------------------------
declare any dividend or distribution upon its common stock, whether in cash,
property, stock, or other securities and whether or not a regular cash dividend;
(b) to effect any reclassification or recapitalization of common stock; (c) to
merge or consolidate with or into any other corporation, or sell, lease,
license, or convey all or substantially all of its assets, or to liquidate,
dissolve or wind up; or (d) to offer holders of registration rights the
opportunity to participate in an underwritten public offering of the company's
securities for cash, then, in connection with each such event, the Company shall
give Holder (1) at least 20 days prior written notice of the date on which a
record will be taken for such dividend, distribution, or subscription rights
(and specifying the date on which the holders of common stock will be entitled
thereto) or for determining rights to vote, if any, in respect of the matters
referred to in (b) and (c) above; (2) in the case of the matters referred to in
(b) and (c) above at least 20 days prior written notice of the date when the
same will take place (and specifying the date on which the holders of common
stock will be entitled to exchange their common stock for securities or other
property deliverable upon the occurrence of such

                                       4
<PAGE>

event); and (3) in the case of the matter referred to in (d) above, the same
notice as is given to the holders of such registration rights.

     3.3  Information Rights. So long as the Holder holds this Warrant and/or
          ------------------
any of the Shares, the Company shall deliver to the Holder (a) promptly after
mailing, copies of all communiques to the shareholders of the Company, (b)
within one hundred fifty (150) days after the end of each fiscal year of the
Company, the annual audited financial statements of the Company certified by
independent public accountants of. recognized standing and (c) within forty-five
(45) days after the end of each of the first three quarters of each fiscal year,
the Company's quarterly, unaudited financial statements.

     3.4  Registration Under Securities Act of 1933, as amended. The Company
          -----------------------------------------------------
agrees that the Shares shall be subject to the registration rights set forth on
Exhibit B.

ARTICLE 4. MISCELLANEOUS.
           -------------

     4.1  Term: Notice of Expiration. This Warrant is exercisable, in whole or
          --------------------------
in part, at any time and from time to time on or before the Expiration Date set
forth above.

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

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

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

     4.4  Transfer Procedure. Subject to the provisions of Section 4.3, Holder
          ------------------
may transfer all or part of this Warrant or the Shares issuable upon exercise of
this Warrant (or the securities issuable, directly or indirectly, upon
conversion of the Shares, if any) by giving the Company notice of the portion of
the Warrant being transferred setting forth the name, address and taxpayer
identification number of the transferee and surrendering this Warrant to the
Company for reissuance to the transferee(s) (and Holder, if

                                       5
<PAGE>

applicable). Unless the Company is filing financial information with the SEC
pursuant to the Securities Exchange Act of 1934, the Company shall have the
right to refuse to transfer any portion of this Warrant to any person who
directly competes with the Company.

     4.5  Notices. All notices and other communications from the Company to the
          -------
Holder, or vice versa, shall be deemed delivered and effective when given
personally or mailed by first-class registered or certified mail, postage
prepaid, or sent by recognized overnight courier at such address as may have
been furnished to the Company or the Holder, as the case may be, in writing by
the Company or such Holder from time to time.

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

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

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

2Bridge Software

By: /s/ Ronald Parks                    By:________________________________
   -------------------------------

Name:   Ronald Parks                    Name:______________________________
     -----------------------------

Title:  CFO                             Title:_____________________________
      ----------------------------

                                       6
<PAGE>

                                  APPENDIX 1

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

     1.  The undersigned hereby elects to purchase ____________ shares of the
Common Stock of 2Bridge Software, A California corporation, pursuant to the
terms of the attached Warrant, and tenders herewith payment of the purchase
price of such shares in full.

     1.  The undersigned hereby elects to convert the attached Warrant into
Shares in the manner specified in the Warrant. This conversion is exercised with
respect to ___________ of the Shares covered by the Warrant.

     [Strike paragraph that does not apply.]

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

               Chief Financial Officer
               Controllers Department
               Imperial Bancorp
               P.O. Box 92991
               Los Angeles, CA 90009
               Or Registered Assignee

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

IMPERIAL BANCORP or Registered Assignee

_________________________________________
(Signature)

_____________________
(Date)

                                       7
<PAGE>

                                   EXHIBIT A
                                   ---------

                           Anti-Dilution Provisions

     In the event of the issuance (a "Diluting Issuance") by the Company, after
the Issue Date of the Warrant, of securities at a price per share less than the
Warrant Price, then the number of shares of common stock issuable upon
conversion of the Shares shall be adjusted in accordance with those provisions
(the "Provisions") of the Company's Articles (Certificate) of Incorporation
which apply to Diluting Issuances.

     The Company agrees that the Provisions, as in effect on the Issue Date,
Shall be deemed to remain in full force and effect during the term of the
Warrant notwithstanding any subsequent amendment, waiver or termination thereof
by the Company's shareholders.

     Under no circumstances shall the aggregate Warrant Price payable by the
Holder upon exercise of the Warrant increase as a result of any adjustment
arising from a Diluting Issuance.

                                       8
<PAGE>

                                   EXHIBIT B
                                   ---------

                              Registration Rights
                              -------------------

     The Shares shall be deemed "registrable securities" or otherwise entitled
to "piggy back" registration rights in accordance with the terms of the
following agreement (the "Agreement") between the Company and its investor(s):

Amended and Restated Investors' Rights Agreement dated May 18, 1998 among the
Company and the shareholders party thereto (holders of Series A and Series B
Preferred Stock)

     The Company agrees that no amendments will be made to the Agreement which
would have an adverse impact on Holder's registration thereunder without the
consent of Holder. By acceptance of the Warrant to which this Exhibit B is
attached, Holder shall not be deemed to be a party to the Agreement, but solely
entitled to the registration rights created thereby.

     If no Agreement exists, then the Company and the Holder shall enter into
Holder's standard form of Registration Rights Agreement as in effect on the
Issue Date of the Warrant.

                                       9

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