EXHIBIT 4.26

THIS WARRANT AND THE  SECURITIES  ISSUABLE  UPON  EXERCISE  HEREOF HAVE NOT BEEN
REGISTERED UNDER THE SECURITIES ACT OF 1933 (THE "SECURITIES ACT") NOR UNDER ANY
STATE  SECURITIES  LAW AND MAY  NOT BE  PLEDGED,  SOLD,  ASSIGNED  OR  OTHERWISE
TRANSFERRED UNTIL (1) A REGISTRATION  STATEMENT UNDER THE SECURITIES ACT AND ANY
APPLICABLE STATE  SECURITIES LAWS HAS BECOME EFFECTIVE WITH RESPECT THERETO,  OR
(2) RECEIPT BY THE COMPANY OF AN OPINION OF COUNSEL TO THE COMPANY TO THE EFFECT
THAT  REGISTRATION  UNDER THE SECURITIES ACT OR APPLICABLE STATE SECURITIES LAWS
IS NOT REQUIRED IN CONNECTION WITH THE PROPOSED TRANSFER.

THIS  WARRANT MAY NOT BE  EXERCISED  EXCEPT IN  COMPLIANCE  WITH ALL  APPLICABLE
FEDERAL AND STATE SECURITIES LAWS TO THE REASONABLE  SATISFACTION OF THE COMPANY
AND LEGAL COUNSEL FOR THE COMPANY.


           Void after 5:00 p.m. New York City Time, on March 31, 2004

               Warrant to Purchase 500,000 Shares of Common Stock

               WARRANT TO PURCHASE COMMON STOCK, PAR VALUE $0.01,

                                       OF

                                ADATOM.COM, INC.

         This is to  Certify  That,  FOR  VALUE  RECEIVED,  Victor W. Nee or his
permitted assigns ("Holder") is entitled to purchase,  subject to the provisions
of this Warrant, from Adatom.com,  Inc., a Delaware corporation (the "Company"),
up to 500,000  fully paid,  validly  issued and  nonassessable  shares of Common
Stock,  par value $.01 per share, of the Company  ("Common Stock") at a price of
$4.375 per share at any time or from time to time  during  the  period  from the
date hereof to March 31, 2004, as set forth under (a) below,  but not later than
5:00 p.m. New York City Time, on March 31, 2004.  The number of shares of Common
Stock to be received  upon the exercise of this Warrant and the price to be paid
for each share of Common Stock may be adjusted from time to time as  hereinafter
set forth.  The shares of Common Stock  deliverable  upon such exercise,  and as
adjusted from time to time, are  hereinafter  sometimes  referred to as "Warrant
Shares" and the exercise  price of a share of Common Stock in effect at any time
and as adjusted from time to time is  hereinafter  sometimes  referred to as the
"Exercise Price."

         (a)      EXERCISE OF WARRANT.  This Warrant may be exercised in  whole,
or in part in  increments  of not less than 20,000  shares,  at any time or from
time  to  time,  until  March  31,  2004.  This  Warrant  may  be  exercised  by
presentation and surrender hereof to the Company at its principal  office, or at
the office of its stock transfer  agent,  if any, with the Purchase Form annexed
hereto as Exhibit A duly  executed  and  accompanied  by payment of the Exercise
Price for the number of Warrant  Shares  specified  in such form and any and all
transfer taxes  applicable to such exercise.  As soon as practicable  after each
such exercise,  but not later than 30 days from the date of such  exercise,  the
Company shall issue and deliver to the Holder a certificate or  certificate  for
the Warrant Shares  issuable upon such  exercise,  registered in the name of the
Holder or its designee.  If this Warrant  should be exercised in part only,  the
Company  shall,  upon  surrender of this Warrant for  cancellation,  execute and
deliver a new Warrant  evidencing  the rights of the Holder  thereof to purchase
the balance of the Warrant Shares purchasable thereunder.

         (b)      RESERVATION OF SHARES.  The Company shall at all times reserve
for issuance and/or delivery upon exercise of this Warrant such number of shares
of its Common Stock as shall be required for issuance and delivery upon exercise
of the Warrant.


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<PAGE>


         (c)      FRACTIONAL SHARES. No fractional shares or script representing
fractional  shares  shall be issued  upon the  exercise  of this  Warrant.  With
respect to any  fraction of a share  called for upon any  exercise  hereof,  the
Company  shall  pay to the  Holder  an  amount  in cash  equal to such  fraction
multiplied by the Current Market Value of a share, determined as follows:

         (1) If the Common Stock is listed on a national  securities exchange or
         admitted to unlisted trading  privileges on such exchange or listed for
         trading on the Nasdaq National  Market,  the Current Market Value shall
         be the last reported sale price of the Common Stock on such exchange or
         market on the last  business  day prior to the date of exercise of this
         Warrant or if no such sale is made on such day, the average closing bid
         and asked prices for such day on such exchange or market; or

         (2) If the  Common  Stock is not so  listed  or  admitted  to  unlisted
         trading  privileges,  but is traded on the Nasdaq Small Cap Market, the
         Current  Market Value shall be the average of the closing bid and asked
         prices for such day on such  market  and if the Common  Stock is not so
         traded, the Current Market Value shall be the mean of the last reported
         bid and asked prices reported by the National Quotation Bureau, Inc. on
         the last business day prior to the date of the exercise of this Warrant
         if such prices are so reported; or

         (3) If the  Common  Stock is not so  listed  or  admitted  to  unlisted
         trading  privileges  and bid and asked prices are not so reported,  the
         Current  Market  Value  shall be an  amount,  not less than book  value
         thereof as at the end of the most  recent  fiscal  year of the  Company
         ending prior to the date of the exercise of the Warrant,  determined in
         such  reasonable  manner as may be prescribed by the Board of Directors
         of the Company.

         (d)      TRANSFER, ASSIGNMENT OR LOSS OF WARRANT.

         (1) This Warrant may not be transferred except in minimum denominations
         of 100,000 shares and in compliance with  applicable  federal and state
         securities  laws.  Upon surrender of this Warrant to the Company at its
         principal  office or at the office of its stock transfer agent, if any,
         with the  Assignment  Form  annexed  hereto  duly  executed  and  funds
         sufficient to pay any transfer tax, the Company shall,  without charge,
         execute and deliver a new Warrant in the name of the assignee  named in
         such  instrument  of  assignment  and this  Warrant  shall  promptly be
         cancelled.

         (2) Upon receipt by the Company of evidence  satisfactory  to it of the
         loss, theft, destruction or mutilation of this Warrant and (in the case
         of   loss,   theft   or   destruction)   of   reasonably   satisfactory
         indemnification,  and upon surrender and  cancellation of this Warrant,
         if  mutilated,  the Company  will  execute and deliver a new Warrant of
         like tenor and date. Any such new Warrant  executed and delivered shall
         constitute  an  additional  contractual  obligation  on the part of the
         Company,  whether or not this Warrant so lost,  stolen,  destroyed,  or
         mutilated shall be at any time enforceable by anyone.

         (e)      ANTI-DILUTION PROVISIONS.  The Exercise Price in effect at any
time and the number and kind of securities  purchasable upon the exercise of the
Warrant shall be subject to  adjustment  from time to time upon the happening of
certain events as follows:

         (1)      In case the Company shall

                  (i)      declare a dividend or make a distribution on its
                  outstanding shares of  Common Stock in shares of Common Stock,

                  (ii)     subdivide or reclassify  its  outstanding  shares  of
                  Common Stock into a greater number of shares, or

                  (iii)    combine  or  reclassify  its  outstanding  shares  of
                  Common Stock into a smaller  number of shares,


                                      E-3

<PAGE>

         the number of shares  subject to the Warrant  shall be  proportionately
         increased,   and  the   Exercise   Price  of  the   Warrant   shall  be
         proportionately  decreased,  in the case of actions specified in (l)(i)
         or (ii)  above;  and the  number  of  shares  shall be  proportionately
         decreased,  and the Exercise Price  proportionately  increased,  in the
         case of actions  specified in (l)(iii) above.  Such adjustment shall be
         made successively whenever any event listed above shall occur.

         (2) No adjustment in the Exercise  Price shall be required  unless such
         adjustment would require an increase or decrease of at least five cents
         ($0.05) in such price; provided, however, that any adjustments which by
         reason of this  Subsection  (2) are not  required  to be made  shall be
         carried  forward and taken into  account in any  subsequent  adjustment
         required to be made hereunder.  All calculations under this Section (e)
         shall be made to the nearest cent or to the nearest whole share, as the
         case may be.

         (3) Whenever the Exercise Price is adjusted,  as herein  provided,  the
         Company shall  promptly but no later than 30 days after any request for
         such an  adjustment  by the Holder,  cause a notice  setting  forth the
         adjusted  Exercise Price and adjusted number of Warrant Shares issuable
         upon  exercise  of  each  Warrant,   and,  if  requested,   information
         describing  the  transactions  giving rise to such  adjustments,  to be
         mailed to the Holder at his last  address  appearing  in the records of
         the  Company,  and  shall  cause a copy  thereof  to be  mailed  to its
         transfer  agent,  if any. The Company may retain a firm of  independent
         certified  public  accountants  selected by the Board of Directors (who
         may be the regular  accountants  employed  by the  Company) to make any
         computation  required by this Section (e), and a certificate  signed by
         such firm  shall be  conclusive  evidence  of the  correctness  of such
         adjustment.

         (4) In the event that at any time,  as a result of an  adjustment  made
         pursuant to Subsection (1) above, the Holder of this Warrant thereafter
         shall become entitled to receive any shares of the Company,  other than
         Common Stock,  thereafter the number of such other shares so receivable
         upon exercise of this Warrant shall be subject to adjustment  from time
         to time in a manner and on terms as nearly equivalent as practicable to
         the provisions with respect to the Common Stock contained in Subsection
         (1) above.

         (5) Irrespective of any adjustments in the Exercise Price or the number
         or kind of shares  purchasable upon exercise of this Warrant,  Warrants
         theretofore or thereafter issued may continue to express the same price
         and number and kind of shares as are stated in the Warrants  previously
         issued.

         (f)      REGISTRATION RIGHTS.  The Company hereby grants the Holder the
right to "piggy back" the Warrant Shares on each Registration  Statement for the
sale of Common  Stock  filed by the Company  (or any  securities  of a successor
company of the Company) at the Company's cost and expense (except those incurred
by the Holder for legal fees and  commissions).  The  obligations of the Company
under this  Section  (f) expire  upon the  earlier of (i) after the  Company has
afforded the  opportunity for the Holder to exercise  registration  rights under
this Section (f) for three  registrations,  (ii) when all of the Warrant  Shares
held by the  Holder  may be sold by the  Holder  under  Rule 144  without  being
subject to any volume restrictions,  or (iii) the fourth anniversary of the date
of this  Warrant.  The  Company  shall give the  Holder at least 30 days'  prior
notice of its intent to file a Registration Statement. The Company shall use its
best  efforts to keep any  Registration  Statement  onto which Holder has "piggy
backed" his Warrant Shares effective for a period of not less than 270 days from
the date  whereby  the  Holder is first  entitled  to sell  thereunder,  or such
shorter  period  terminating  when the Holder has sold all of his  shares.  Such
"piggy back" rights are subject to standard underwriters' approval and holdback,
whereby the Holder's rights to sell in a public offering may be limited pro rata
with the other stockholders,  and shall not apply to any Warrant Shares that can
be sold under SEC Rule 144 without  volume  restrictions.  For  purposes of this
Section  (f),  the term  Registration  Statement  shall  mean  any  registration
statement for the sale of common stock or other  securities filed by the Company
or filed by any  successor  entity  (in the  case of  merger,  reclassification,
change, consolidation,  sale or conveyance of the Company) under the Act (except
for a  Registration  Statement  on Form  S-4,  Form  S-8 or any  successor  form
thereto).

         (g)      NOTICES  TO  WARRANT  HOLDERS.  So long as this  Warrant shall
be  outstanding,  (i)  if the  Company  shall  pay  any  dividend  or  make  any
distribution  upon the Common  Stock or (ii) if the  Company  shall offer to the
holders of Common  Stock for  subscription  or purchase by them any share of any
class or any other

                                      E-4

<PAGE>

rights or (iii) if any capital  reorganization of the Company,  reclassification
of the capital stock of the Company, consolidation or merger of the Company with
or into another corporation, sale, lease or transfer of all or substantially all
of the property and assets of the Company to another  corporation,  or voluntary
or  involuntary  dissolution,  liquidation or winding up of the Company shall be
effected,  then in any such  case,  the  Company  shall  cause to be  mailed  by
certified  mail to the Holder,  at least 15 days prior the date specified in (x)
or (y) below, as the case may be, a notice containing a brief description of the
proposed  action and  stating  the date on which (x) a record is to be taken for
the   purpose  of  such   dividend,   distribution   or  rights,   or  (y)  such
reclassification,  reorganization,  consolidation,  merger,  conveyance,  lease,
dissolution,  liquidation or winding up is to take place and the date, if any is
to be fixed, as of which the holders of Common Stock or other  securities  shall
receive  cash  or  other  property   deliverable  upon  such   reclassification,
reorganization,  consolidation,  merger, conveyance, dissolution, liquidation or
winding up.

         (h)      RECLASSIFICATION,  REORGANIZATION  OR  MERGER.  In case of any
reclassification,  capital  reorganization or other change of outstanding shares
of Common Stock of the Company, or in case of any consolidation or merger of the
Company  with or into  another  corporation  (other  than a merger  in which the
Company  is  the  continuing  corporation  and  which  does  not  result  in any
reclassification,  capital  reorganization or other change of outstanding shares
of Common Stock  issuable upon exercise of this Warrant) or in case of any sale,
lease or conveyance to another  corporation of the property of the Company as an
entirety, the Company shall, as a condition precedent to such transaction, cause
effective  provisions  to be  made so that  the  Holder  shall  have  the  right
thereafter by exercising this Warrant at any time prior to the expiration of the
Warrant, to purchase the kind and amount of shares of stock and other securities
and property receivable upon such  reclassification,  capital reorganization and
other  change,  consolidation,  merger,  sale or  conveyance  by a holder of the
number of shares of Common Stock which might have been  purchased  upon exercise
of  this   Warrant   immediately   prior  to  such   reclassification,   change,
consolidation,  merger,  sale or conveyance.  Any such  provision  shall include
provision  for  adjustments  which  shall  be as  nearly  equivalent  as  may be
practicable to the adjustments provided for in this Warrant.

         (i)      COMPLIANCE WITH SECURITIES ACT.   The  Holder,  by  acceptance
         hereof,

         (1)  represents (i) that this Warrant and the Common Stock to be issued
         upon exercise of this Warrant are being  acquired for  investment  only
         and not with a view  toward  distribution  or resale,  and (ii) that he
         will not offer, sell or otherwise dispose of this Warrant or any Common
         Stock   purchasable   upon  exercise  of  this  Warrant   except  under
         circumstances  which will not result in a violation  of the  Securities
         Act; and

         (2)  agrees that upon  exercise of this  Warrant, the Holder  shall (i)
         submit  to the  Company  a signed  copy of  Exhibits  A and C  attached
         hereto,  (ii)  provide  such  additional   information  regarding  such
         holder's  financial  and  investment  background  as  the  Company  may
         reasonably  request,  and (iii) all shares of Common  Stock issued upon
         exercise of this Warrant (unless  registered  under the Securities Act)
         shall be stamped or imprinted with a restrictive  legend  substantially
         in the form of the following:

                  THESE SHARES HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT
                  OF 1933 (THE "SECURITIES  ACT") NOR UNDER ANY STATE SECURITIES
                  LAWS  AND MAY NOT BE  PLEDGED,  SOLD,  ASSIGNED  OR  OTHERWISE
                  TRANSFERRED  UNTIL  (1) A  REGISTRATION  STATEMENT  UNDER  THE
                  SECURITIES ACT AND ANY APPLICABLE  STATE  SECURITIES  LAWS HAS
                  BECOME EFFECTIVE WITH RESPECT  THERETO,  OR (2) RECEIPT BY THE
                  COMPANY OF AN OPINION OF COUNSEL TO THE  COMPANY TO THE EFFECT
                  THAT REGISTRATION UNDER THE SECURITIES ACT OR APPLICABLE STATE
                  SECURITIES  LAWS  IS  NOT  REQUIRED  IN  CONNECTION  WITH  THE
                  PROPOSED TRANSFER.

         (j)      NO AVOIDANCE.   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

                                      E-5

<PAGE>

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.

         (k)      CERTAIN LIMITATIONS OF HOLDER.   The Holder, by hereof, agrees
         that:

         (1)  STOP-TRANSFER  NOTICES.  In order to  ensure  compliance  with the
         restrictions  referred to herein,  the  Company  may issue  appropriate
         "stop transfer" instructions to its transfer agent, if any, and, if the
         Company transfers its own securities, it may make appropriate notations
         to the same effect in its own records;

         (2)  REFUSAL TO  TRANSFER.  The  Company  shall not be  required to (i)
         transfer the Warrant on its books or transfer any securities  that have
         been  sold  or  otherwise  transferred  in  violation  of  any  of  the
         provisions of this  Warrant;  or (ii) treat as the owner of the Warrant
         or any such  securities,  or accord the right to vote or pay  dividends
         to, any  purchaser or other  transferee to whom such  securities  shall
         have been so transferred; and

         (3) RIGHTS OF STOCKHOLDERS.  No holder of the Warrant shall be entitled
         to vote or  receive  dividends  or be deemed a  stockholder,  nor shall
         anything  contained  herein be construed to confer upon the Holder,  as
         such, 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,  change  of par value or change of
         stock to no par value, consolidation, merger, conveyance, or otherwise)
         or to receive notice of meetings,  or to receive  dividends,  until the
         Warrant  shall  have been  exercised  and the Common  Stock  shall have
         become deliverable, as provided herein.

         (l)      GOVERNING LAW.  The terms and conditions of this Warrant shall
 be governed by and construed in accordance with the
laws of the State of Delaware.

         (m)      MISCELLANEOUS.  The  headings in this Warrant are for purposes
of convenience  and reference only, and shall not be deemed to constitute a part
hereof.  Neither  this  Warrant  nor any term  hereof  may be  changed,  waived,
discharged or terminated in any manner except by an instrument in writing signed
by the Company and the Holder.

         All notices and other  communications from the Company to the holder of
this Warrant  shall be mailed by  first-class  registered  or certified  mail or
recognized  commercial courier service,  postage or delivery charges prepaid, to
the  address  furnished  to the  Company in  writing by the last  holder of this
Warrant who shall have furnished an address to the Company in writing.

         IN WITNESS  WHEREOF,  the Company  has caused this  Warrant to Purchase
Common Stock to be duly executed by one of its duly authorized officers.

                                           ADATOM.COM, INC.


                                  By:      /s/RICHARD S. BARTON
                                           --------------------
                                              Richard S. Barton
                                              Chairman of the Board
                                              and Chief Executive Officer

                                  Date:    May 25, 2000



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<PAGE>


                                    Exhibit A

                                  PURCHASE FORM

                          Dated ____________, 20_______



1.       The  undersigned  hereby  irrevocably  elects  to  exercise  the within
Warrant to the extent of  purchasing  _______  shares of Common Stock and hereby
makes payment of  _____________ in payment of the actual exercise price thereof,
together with all applicable transfer taxes, if any.

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

                                   (Please typewrite or print in block letters)


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

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

                        ---------------------------------
                                    (Address)

3.       The  undersigned  has  reviewed,  signed  and  enclosed  an  Investment
Representation Statement in the form attached as Exhibit C to the Warrant.


                                              ---------------------------------
                                              Signature of Warrantholder



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<PAGE>


                                    Exhibit B

                                 ASSIGNMENT FORM


         FOR VALUE RECEIVED, ______________ hereby sells, assigns and  transfers
unto


Name _______________________________________
(Please typewrite or print in block letters)

Address ____________________________________

the right to purchase Common Stock  represented by this Warrant to the extent of
______ shares as to which such right is exercisable and does hereby  irrevocably
constitute  and appoint  ___________  as  attorney,  to transfer the same on the
books of the Company with full power of substitution in the premises.


Date ____________, 20_______


Signature _____________________________



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<PAGE>


                                    Exhibit C

                                ADATOM.COM, INC.

                                     WARRANT

                       INVESTMENT REPRESENTATION STATEMENT


AMOUNT:  ________________________

DATE:    _______________, 2000


         In connection  with the purchase of the  above-listed  securities  (the
"Securities") from ADATOM.COM, INC. ("the Company"), I the undersigned 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  ("Securities
Act").

         (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.

         (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 aware of the  provisions  of Rule 144, promulgated  under
the  Securities  Act,  which,  in substance,  permits  limited  public resale of
"restricted  securities"  acquired,  directly  or  indirectly,  from the  issuer
thereof (or from an affiliate of such  issuer),  in a  transaction  or series of
transactions not involving a non-public offering, subject to the satisfaction of
certain conditions.

         (e)      I  further  understand  that at  the  time I wish  to sell the
Securities there may be no public market upon which to make such a sale.

         (f)      I further understand that in the event all of the 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.

                                             -----------------------------------
                                                     Name of Purchaser

                                             -----------------------------------
                                                     Date


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