Document:

<PAGE>   1
                                   EXHIBIT 4.9

THE SALE AND ISSUANCE OF THE SECURITIES REPRESENTED BY THIS CERTIFICATE HAVE NOT
BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE "ACT"), OR
UNDER THE SECURITIES LAW OF ANY STATE OR OTHER JURISDICTION. THESE SECURITIES
HAVE BEEN ACQUIRED FOR INVESTMENT AND NOT WITH A VIEW TO, OR IN CONNECTION WITH,
THE DISTRIBUTION THEREOF. THESE SECURITIES MAY NOT BE OFFERED, SOLD PLEDGED, OR
TRANSFERRED UNLESS (I) A REGISTRATION STATEMENT UNDER THE ACT IS IN EFFECT AS TO
THESE SECURITIES AND SUCH OFFER, SALE, PLEDGE, OR TRANSFER IS IN COMPLIANCE WITH
APPLICABLE SECURITIES LAW OF ANY STATE OR OTHER JURISDICTION OR (II) THERE IS AN
OPINION OR COUNSEL OR OTHER EVIDENCE, SATISFACTORY TO THE COMPANY, THAT AN
EXEMPTION THEREFROM IS AVAILABLE AND THAT SUCH OFFER, SALE PLEDGE, OR TRANSFER
IS IN COMPLIANCE WITH APPLICABLE AND THAT SUCH OFFER, SALE, PLEDGE, OR TRANSFER
IS IN COMPLIANCE WITH APPLICABLE SECURITIES LAW OF ANY STATE OR OTHER
JURISDICTION.

              AMENDED AND RESTATED CONVERTIBLE TERM PROMISSORY NOTE

$905,000.00                                                    December 22, 2000

         FOR VALUE RECEIVED, the undersigned E-Sync Networks, Inc., a Delaware
corporation (the "Maker"), having an address at 35 Nutmeg Drive, Trumbull, CT
06611, hereby unconditionally promises to pay to the order of the Payee listed
on the signature page hereto ("Payee"), at the office of the Payee as is set
forth on the signature page hereto, of such other office as the holder hereof
may designate, in lawful money of the United States, the principal sum of NINE
HUNDRED FIVE THOUSAND DOLLARS ($905,000.00), together with interest thereon as
provided for below.

         This Convertible Term Promissory Note (the "Note"), together with any
other Convertible Term Promissory Notes issued by the Maker on or after the date
hereof in this form in the aggregate amount of up to $1,000,000, are
collectively referred to as the "Notes".

1.       INTEREST RATE. Maker shall pay interest, in arrears, on the unpaid
principal balance hereof outstanding from time to time at a rate equal to Ten
Percent (10%) per annum. Interest shall commence to accrue on the date hereof
and shall continue until the principal hereof is paid in full (whether before or
after maturity or judgment).

         Anything contained in this Note to the contrary notwithstanding, the
Payee does not intend to charge and the Maker shall not be required to pay
interest or other charges in excess of the maximum rate permitted by applicable
law. Any payments in excess of such maximum rate shall be refunded to Maker or
credited against principal.
<PAGE>   2
2.       PAYMENT OF PRINCIPAL AND INTEREST. Maker shall pay all interest and
principal due hereon on April 15, 2001; provided, however, that in the event
that, after the date hereof and in addition to the sale of the Notes, Maker
receives additional funds of not less than $1,000,000.00 in the aggregate on
terms substantially similar to the terms of this Note (or upon other terms
determined to be satisfactory by the holder of a majority in the amount of the
Notes), then the date on which such interest and principal shall be due
hereunder shall be extended to May 31, 2001 (such date, or as extended, as the
case may be, the "Due Date"). All payments shall first be applied to interest
and then to principal.

3.       VOLUNTARY PREPAYMENT. Maker may not prepay any amounts due hereon, in
whole or in part, without the prior written consent of the Payee (which may be
withheld at Payee's sole discretion).

4.       EXPENSES. Maker shall pay the Payee, on demand, for all reasonable
costs and expenses (including, but not limited to, reasonable attorneys' fees)
incurred in the preparation of the Notes and the consummation of the loans being
made in connection herewith, and (upon a default) collection of this Note.

5.       VOLUNTARY CONVERSION. If this Note has not converted pursuant to
Section 6 below prior to the Due Date, then the Payee shall have the option to
convert this Note, at any time prior to the first to occur of (i) payment
thereof and (ii) the 180th day subsequent to the Due Date, into such whole
number of fully paid and non-assessable shares of the Maker's common stock, par
value $0.01 per share ("Common Stock"), that is equal to the quotient of (a) the
outstanding principal hereunder plus all interest accrued thereon; divided by
(b) $0.25; provided, however, that such principal and accrued interest thereon
shall not be convertible into more than 600,000 shares of Common Stock.

6.       MANDATORY CONVERSION.

         (a) RIGHTS UPON FINANCING. The outstanding principal hereunder and all
interest accrued hereon shall, automatically and without the need for further
action or consent of any party, on the initial closing date of the Next
Financing Round (as defined below), be converted into such number of fully paid
and non-assessable Preferred Shares that is equal to the quotient of (a) the
outstanding principal hereunder plus all interest accrued thereon divided by (b)
the per share initial offering price of such Preferred Shares.

         (b) DEFINITIONS. For purposes of this Section 6: (i) "Next Financing
Round" means the issuance by the Maker in its next round of outside equity or
debt financing of the Maker's preferred stock or convertible debt securities, as
the case may be (and which may include the Notes) in consideration of not less
than $3,500,000 in cash (inclusive of amounts paid by the conversion of any
Notes); and (ii) "Preferred Shares" means shares of that series of preferred
stock of the Maker, or securities convertible into the same, issued in the Next
Financing Round.
<PAGE>   3
         (c) NEGATIVE COVENANT. In order to protect Payee's conversion rights
pursuant to this Section 6, Maker shall not, while any amounts remain
outstanding on this Note, sell any preferred stock except (i) to Payee, (ii)
with the prior written consent of Payee, or (iii) in a Next Financing Round.

7.       FRACTIONAL SHARES. Upon the conversion of this Note pursuant to either
Section 5 or Section 6, no fractional shares or scrip representing fractional
shares shall be issued. With respect to any fraction of a share called for upon
the conversion of this Note or any portion hereof, a cash amount equal to such
fraction shall be paid to the Payee.

8.       DEFAULT; ACCELERATION. The occurrence of any of the following shall
constitute an "Event of Default":

         (a)      Maker shall fail to make any payment of any principal,
                  interest or other amount when due under any of the Notes and
                  such failure shall continue for a period of five (5) business
                  days.

         (b)      Maker shall be dissolved or shall make an assignment for the
                  benefit of creditors; or shall have a receiver, custodian,
                  trustee or conservator appointed for all or substantially all
                  its assets.

         (c)      Any case or proceeding under any bankruptcy, insolvency,
                  receivership or similar law affecting Maker shall be commenced
                  (provided that if such case or proceeding is not commenced by
                  Maker, same remains undismissed for a period of sixty (60)
                  days).

         (d)      Any representation or warranty of Maker contained in any Note
                  or any related document shall prove to be untrue or misleading
                  in any material respect.

Upon the occurrence, and at any time during the continuance, of an Event of
Default, Payee, at Payee's option and without the need for presentment, demand,
protest, or other notice of any kind, may declare all unpaid principal hereof
and interest hereunder to be immediately due and payable and same shall become
immediately due and payable upon such declaration. Any actions by the Payees of
the Notes pursuant to this Section 8 shall be taken by the majority in interest
of the Notes.

9.       CERTAIN WAIVERS. Maker and any endorser or guarantor hereof
(collectively, the "Obligors") and each of them: (i) waive(s) presentment,
diligence, protest, demand, notice of demand, notice of acceptance or reliance,
notice of non-payment, notice of dishonor, notice of protest and all other
notices to parties in connection with the delivery, acceptance, performance,
default or enforcement of this Note, any endorsement or guaranty of this Note,
or any collateral or other security; (ii) consent(s) to any and all delays,
extensions, renewals or other modifications
<PAGE>   4
with respect to this Note, any related document or the debt(s) or collateral
evidenced hereby or thereby or any waivers of any term hereof or thereof, any
release, surrender, taking of additional, substitution, exchange, failure to
perfect, record, preserve, realize upon, or lawfully dispose of, or any other
impairment of, any collateral or other security, or any other failure to act by
the Payee or any other forbearance or indulgence shown by the Payee, from time
to time and in one or more instances (without notice to or assent from any of
the Obligors) and agree(s) that none of the foregoing shall release, discharge
or otherwise impair any of their liabilities; (iii) agree(s) that the full or
partial release or discharge of any Obligor(s) shall not release, discharge or
otherwise impair the liabilities of any other Obligor(s); and (iv) otherwise
waive(s) any other defenses based on suretyship or impairment of collateral.

10.      COMMERCIAL TRANSACTION; JURY WAIVER. EACH OF THE PAYEE AND THE MAKER
ACKNOWLEDGES THAT THE TRANSACTION OF WHICH THIS NOTE IS A PART IS A COMMERCIAL
TRANSACTION. EACH OF THE PAYEE AND THE MAKER HEREBY KNOWINGLY AND VOLUNTARILY
WAIVES TRIAL BY JURY AND THE RIGHT THERETO IN ANY ACTION OR PROCEEDING OF ANY
KIND, ARISING UNDER OR OUT OF, OR OTHERWISE RELATED TO OR OTHERWISE CONNECTION
WITH, THIS NOTE AND/OR ANY RELATED DOCUMENT.

11.      BINDING NATURE. This Note shall bind the Maker and Maker's heirs,
representatives, successors and assigns and shall inure to the benefit of the
Payee and its successors and assigns. The term "Payee" as used herein shall
include, in addition to the initial Payee, any successors, endorsees, or other
assignees of such Payee and shall also include any other holder of this Note.

12.      SUBORDINATION. Notwithstanding anything to the contrary herein, Payee
and each holder from time to time of this Note by its acceptance hereof agrees
that all payments on this Note shall be subordinate and subject in right of
payment to the prior payment in full of all Senior Debt (as defined below), and
further agrees that it shall enter into such agreements with Maker and the
holders of any such Senior Debt to acknowledge and evidence the terms of such
subordination as Maker shall from time to time reasonably request, provided,
however, that the provisions of this Section 12 and the terms of any such
agreements do not prevent or limit the exercise by Payee of its right to convert
this Note into equity pursuant to Section 5 or Section 6 hereof. For purposes of
this Note, "Senior Debt" means (a) all obligations of Maker in respect of any
indebtedness of Maker to banks, financial institutions or institutional lenders
or investors, including, without limitation, obligations in respect of
principal, premium, interest, reimbursement obligations and fees and expenses,
and (b) any and all renewals, extensions, increases or rearrangements of any of
the foregoing, in each case, whether existing on the date of this Note or
hereafter created, incurred or acquired. Without limiting or expanding the
foregoing provisions of this definition, this Note is not intended to be either
superior or subordinate in right of payment to any obligation of Maker, whether
existing on the date of this Note or hereafter created, other than Senior Debt.
<PAGE>   5
13.      GOVERNING LAW. This Note shall be governed by and construed and
interpreted in accordance with the laws of the State of Connecticut, without
regard to its rules pertaining to conflicts of laws thereunder.

14.      MISCELLANEOUS. No delay or omission by the Payee in exercising any
right or remedy hereunder or under any guaranty hereof shall operation as a
waiver of such right or remedy or any other right or remedy, and a waiver on one
occasion shall not be a bar to or waiver of any right or remedy on any other
occasion. All rights and remedies of the Payee hereunder, any other applicable
document and under applicable law shall be cumulative and not in the
alternative. No provision of this Note or any guaranty hereof may be waived or
modified orally but only by a writing signed by the party against whom
enforcement of such amendment, waiver or other modification is sought.
<PAGE>   6
         IN WITNESS WHEREOF, the Maker has executed and delivered this Note as
of the day and year first written above.

                                     E-SYNC NETWORKS, INC.

                                     By: /s/ Michael W.G. Fix
                                         -------------------------------------
                                     Name:  Michael W.G. Fix
                                     Title:    Chairman and CEO

Payee:   CE Capital Partnership, L.P.

Address:    375 Park Avenue, Suite 1604
            New York, NY 10152<PAGE>   1
                                  EXHIBIT 4.10

THE SALE AND ISSUANCE OF THE SECURITIES REPRESENTED BY THIS CERTIFICATE HAVE NOT
BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE "ACT"), OR
UNDER THE SECURITIES LAW OF ANY STATE OR OTHER JURISDICTION. THESE SECURITIES
HAVE BEEN ACQUIRED FOR INVESTMENT AND NOT WITH A VIEW TO, OR IN CONNECTION WITH,
THE DISTRIBUTION THEREOF. THESE SECURITIES MAY NOT BE OFFERED, SOLD, PLEDGED, OR
TRANSFERRED UNLESS (I) A REGISTRATION STATEMENT UNDER THE ACT IS IN EFFECT AS TO
THESE SECURITIES AND SUCH OFFER, SALE, PLEDGE, OR TRANSFER IS IN COMPLIANCE WITH
APPLICABLE SECURITIES LAW OF ANY STATE OR OTHER JURISDICTION OR (II) THERE IS AN
OPINION OF COUNSEL OR OTHER EVIDENCE, IN EITHER CASE, SATISFACTORY TO THE ISSUER
OF THIS CERTIFICATE, THAT AN EXEMPTION THEREFROM IS AVAILABLE AND THAT SUCH
OFFER, SALE, PLEDGE, OR TRANSFER IS IN COMPLIANCE WITH APPLICABLE SECURITIES LAW
OF ANY STATE OR OTHER JURISDICTION.

WARRANT CERT. NO. 2000-04    WARRANTS TO PURCHASE 108,600 SHARES OF COMMON STOCK

DATE: DECEMBER 22, 2000

                   AMENDED AND RESTATED TRANSFERABLE WARRANTS

                           TO PURCHASE COMMON STOCK OF

                              E-SYNC NETWORKS, INC.

         THIS CERTIFIES THAT, for value received, CE Capital Partnership, L.P.
with an address of 375 Park Avenue, Suite 1604, New York, New York 10152, or
registered assignees, is entitled to purchase from E-Sync Networks, Inc., a
corporation organized and existing under the laws of the State of Delaware
(hereinafter called the "Company"), at a purchase price equal to the "Exercise
Price" (as hereinafter defined), at any time from and after the date hereof to
and including the "Final Exercise Date" (as hereinafter defined), one hundred
eight thousand six hundred (108,600) shares of the Company's Common Stock, $.01
par value (the "Warrant Shares"), subject, however, to the provisions and upon
the terms and conditions hereinafter set forth. The Exercise Price shall
initially be Seventy Five Cents ($0.75) per share, subject to adjustment as
hereinafter provided.

         Certain capitalized terms used in this Warrant Certificate and not
otherwise defined are defined in paragraph 4 hereof. By accepting this Warrant
Certificate, the holder agrees to be bound by the terms hereof.

         THESE WARRANTS ARE SUBJECT TO THE FOLLOWING TERMS AND CONDITIONS:

         1.       (a) Exercise of Warrants. The rights represented by this
Warrant Certificate may be exercised by the registered holder hereof, in whole
or in part (but not as to a fractional share of Common Stock), by (i) the
delivery of this Warrant Certificate, together with a properly completed
Subscription
<PAGE>   2
Form, to the principal office of the Company at 35 Nutmeg Drive, Trumbull,
Connecticut 06611 (or such other office or agency of the Company as it may
designate by notice in writing to the holder hereof) and (ii) payment to the
Company, in immediately available funds, of the Exercise Price for the Warrant
Shares being purchased. Certificates for the Warrant Shares so purchased
(together with a cash adjustment in lieu of any fraction of a share) shall be
delivered to the holder hereof within a reasonable time, not exceeding twenty
(20) business days, after the rights represented by this Warrant Certificate
shall have been so exercised and paid for, and, unless these Warrants have
expired, a new Warrant Certificate representing the number of Warrants, if any,
with respect to which this Warrant Certificate shall not then have been
exercised, in all other respects identical with this Warrant Certificate, shall
also be issued and delivered to the holder hereof within such time, or
appropriate notation may be made on this Warrant Certificate and the same
returned to such holder.

                  (b) Transfer Restriction Legend. Each certificate for Warrant
Shares issued upon exercise of these Warrants shall bear the legends appearing
on the first page of this Warrant Certificate.

         2.       Special Agreements of the Company. The Company covenants and
agrees that:

                  (a) Character of Warrant Shares. All Warrant Shares which may
be issued upon the exercise of the Warrants represented hereby, upon issuance,
will be duly authorized, validly issued, fully paid and non-assessable and free
from all taxes, liens and charges with respect to the issue thereof, and without
limiting the generality of the foregoing, that it will take from to time all
such action as may be requisite to ensure that the par value per share (if any)
of the Common Stock is at all times equal to or less than the then effective
Exercise Price, and that it will refrain from taking any action which could
pursuant to the terms of the Warrants result in the Exercise Price per share
being less than the par value per share of the Common Stock;

                  (b) No Violations. The Company will take all such action as
may be necessary to ensure that Warrant Shares may be so issued without
violation of any applicable United States state or federal law or regulation, or
of any requirements of any securities exchange or inter-dealer quotation system
upon which the Common Stock of the Company may be listed or quoted;

                  (c) Actions in Avoidance. The Company will not, by amendment
of its Certificate or Articles of Incorporation or through any reorganization,
transfer of assets, consolidation, merger, issue or sale of securities or
otherwise, avoid or take any action which would have the effect of avoiding the
observance or performance of any of the terms to be observed or performed
hereunder by the Company, but will at all times in good faith assist in carrying
out all of the provisions of this Warrant Certificate and in taking all of such
action as may be necessary or appropriate in order to protect the rights of the
holders of these Warrants; and

                  (d) Financial Information. The Company will, if requested,
provide each Warrant holder copies of all annual, quarterly and current reports
required to be filed by it pursuant to Section 13 or 15 of the Securities
Exchange Act of 1934, as amended, and in addition, promptly after requested,
such other information concerning the Company as any Warrant holder may
reasonably require (i) in order to comply with any law or governmental
regulation, order of any court, or order, inquiry or investigation of any
governmental agency or instrumentality, or (ii) in order to exercise any right
or privilege of such Warrant holder or to enforce any obligation of the Company
under the Warrants or any agreement or instrument executed and delivered in
connection therewith.

         3.       (a) Stock Dividends, Subdivisions, Split-Ups. If, at any time
prior to the Final Expiration Date, the number of shares of Common Stock
outstanding is increased by a stock dividend payable in shares of Common Stock
or by a subdivision or split-up of shares of Common Stock, then, following the
record date fixed for the determination of holders of Common Stock entitled to
receive such stock dividend, subdivision or split-up, the Exercise Price shall
be appropriately decreased in proportion to such increase in outstanding shares.
<PAGE>   3
                  (b) Stock Combinations. If, at any time prior to the Final
Expiration Date, the number of shares of Common Stock outstanding is decreased
by a combination of the outstanding shares of Common Stock, then, following the
record date for such combination, the Exercise Price shall be appropriately
increased in proportion to such decrease in outstanding shares.

                  (c) Certain Dividends. If, at any time prior to the Final
Expiration Date, the Company shall declare a cash dividend upon its Common Stock
payable otherwise than out of earnings or earned surplus or shall distribute to
holders of its Common Stock shares of its capital stock (other than Common
Stock), stock or other securities of other persons, evidences of indebtedness
issued by the Company or other persons, assets (excluding cash dividends and
distributions) or options or rights (excluding options to purchase and rights to
subscribe for Common Stock or other securities of the Company convertible into
or exchangeable for Common Stock), then, in each such case, immediately
following the record date fixed for the determination of the holders of Common
Stock entitled to receive such dividend or distribution, the Exercise Price in
effect thereafter shall be determined by multiplying the Exercise Price in
effect immediately prior to such record date by a fraction of which the
numerator shall be an amount equal to the difference of (x) the Current Market
Price of one share of Common Stock minus (y) the fair market value (as
determined by the Board of Directors of the Company, whose determination shall
be conclusive) of the stock, securities, evidences of indebtedness, assets,
options or rights so distributed in respect of one share of Common Stock, and of
which the denominator shall be such Current Market Price.

                  (d) All calculations under this Section 3 shall be made to the
nearest cent or to the nearest share, as the case may be.

                  (e) Whenever the Exercise Price shall be increased or
decreased pursuant to subsections (a), (b) and/or (c) of this Section 3, the
number of shares of Common Stock acquirable upon the full exercise hereof shall
be increased (in the case of a decrease in the Exercise Price) or decreased (in
the case of an increase in the Exercise Price) to that number of shares of
Common Stock obtained by multiplying the number of shares for which this Warrant
was fully exercisable immediately before the event giving rise to the Exercise
Price adjustment by a fraction, the numerator of which is the Exercise Price
immediately prior to such event and the denominator of which is the Exercise
Price immediately upon the consummation of such event. Whenever the Exercise
Price shall be adjusted as provided in Section 3, the Company shall prepare a
statement showing the facts requiring such adjustment and the Exercise Price
that shall be in effect after such adjustment. The Company shall cause a copy of
such statement to be sent by mail, first class postage prepaid, to the holder of
this Warrant at its address appearing on the Company's records. Where
appropriate, such copy may be given in advance and may be included as part of
the notice required to be mailed under the provisions of subsection (a) of this
Section 3.

                  (f) Adjustments made pursuant to clauses (a), (b) and (c)
above shall be made on the date such issuance, dividend, subdivision, split-up,
combination or distribution, as the case may be, is made, and shall become
effective at the opening of business on the business day next following the
record date for the determination of stockholders entitled to such dividend,
subdivision, split-up, combination or distribution.

                  (g) In the event the Company shall propose to take any action
of the types described in clauses (a), (b) or (c) of this Section 3, the Company
shall forward, at the same time and in the same manner, to the Holder of this
Warrant such notice, if any, which the Company shall give to the holders of
capital stock of the Company.

                  (h) In any case in which the provisions of this Section 3
shall require that an adjustment shall become effective immediately after a
record date for an event, the Company may defer until the occurrence of such
event issuing to the holder of all or any part of this Warrant which is
exercised after such record date and before the occurrence of such event the
additional shares of capital stock issuable upon such exercise by reason of the
adjustment required by such event over and above the shares
<PAGE>   4
of capital stock issuable upon such exercise before giving effect to such
adjustment exercise; provided, however, that the Company shall deliver to such
holder a due bill or other appropriate instrument evidencing such holder's right
to receive such additional shares upon the occurrence of the event requiring
such adjustment.

         4.       Definitions. The terms defined in this paragraph, whenever
used in this Warrant Certificate, shall, unless the context otherwise requires,
have the respective meanings hereinafter specified:

                  (a) "Common Stock" shall mean and include the Company's Common
Stock, $.01 par value, and shall also include in case of any reorganization,
reclassification, consolidation, merger or sale of assets, the stock, securities
or assets provided to holders of the Company's Common Stock in exchange
therefor.

                  (b) "Company" shall mean E-Sync Networks, Inc. and also
include any successor thereto with respect to the obligations hereunder, by
merger, consolidation or otherwise.

                  (c) "Current Market Price" shall mean, at any date and with
respect to one share of Common Stock, the average of the daily closing prices
for the 30 consecutive business days ending no more than five business days
before the day in question (as adjusted for any stock dividend, split,
combination or reclassification that took effect during such 30 business day
period). The closing price for each day shall be the last reported sales price
regular way or, in case no such reported sales took place on such day, the
average of the last reported bid and asked prices regular way, in either case on
the principal national securities exchange on which the Common Stock is listed
or admitted to trading or as reported by Nasdaq (or if the Common Stock is not
at the time listed or admitted for trading on any such exchange or if prices of
the Common Stock are not reported by Nasdaq then such price shall be equal to
the average of the last reported bid and asked prices on such day as reported by
The National Quotation Bureau Incorporated or any similar reputable quotation
and reporting service, if such quotation is not reported by The National
Quotation Bureau Incorporated); provided, however, that if the Common Stock is
not traded in such manner that the quotations referred to herein are available
for the period required hereunder, the Current Market Price shall be determined
in good faith by the Board of Directors of the Company or, if such determination
cannot be made, by a nationally recognized independent investment banking firm
selected by the Board of Directors of the Company (or if such selection cannot
be made, by a nationally recognized independent investment banking firm selected
by the American Arbitration Association in accordance with its rules).

                  (d) "Final Exercise Date" shall mean December 22, 2005.

                  (e) "Warrant Certificate" shall mean this instrument
evidencing the Warrants issued to the Warrant holder on this date.

                  (f) "Warrant holder(s)" shall mean the registered holder(s) of
the Warrants.

                  (g) "Warrants" shall mean the Warrants represented by this
Warrant Certificate and all Warrants issued in exchange, transfer or replacement
or hereof or thereof.

                  (h) "Warrant Shares" shall mean the shares of Common Stock
purchased or purchasable by the holders of Warrants upon the exercise thereof
pursuant to paragraph 1.

         5. Exchange, Replacement and Assignability. This Warrant Certificate is
exchangeable, upon the surrender hereof by the holder hereof at the office or
agency of the Company described in paragraph 1, for new Warrant Certificates of
like tenor and date representing in the aggregate the right to purchase the
number of Warrant Shares which may be purchased hereunder, each of such new
Warrants to represent the right to purchase such number of Warrant Shares as
shall be designated by such holder hereof at the time of such surrender. Upon
receipt of evidence satisfactory to the Company of the loss, theft,
<PAGE>   5
destruction or mutilation of this Warrant Certificate or any such new Warrant
Certificates and, in the case of any such loss, theft or destruction, of a bond
of indemnity or other security satisfactory to the Company, or, in the case of
any such mutilation, upon surrender or cancellation of such mutilated Warrant
Certificate, the Company will issue to the holder hereof a new Warrant
Certificate of like tenor and date, in lieu of this Warrant Certificate or such
new Warrant Certificates, representing the right to purchase the number of
Warrant Shares which may be purchased hereunder. Subject to compliance with
paragraph 2, this Warrant and all rights hereunder are transferable in whole or
in part upon the books of the Company by the registered holder hereof in person
or by duly authorized attorney, and a new Warrant Certificate shall be made and
delivered by the Company, of the same tenor and date as this Warrant Certificate
but registered in the name of the transferee, upon surrender of this Warrant
Certificate, duly endorsed, to the office or agency of the Company. All
expenses, taxes (other than stock transfer taxes, which shall be the obligation
of the Warrant holder) and other charges payable in connection with the
preparation, execution and delivery of Warrants pursuant to this paragraph 5
shall be paid by the Company.

         6. No Rights as Stockholder; Survival of Rights. Neither this Warrant
Certificate nor the Warrants represented hereby shall entitle the holder hereof
to any voting rights or any rights as a stockholder of the Company. The rights
and obligations of the Company, of the holder of these Warrants and of any
holder of Warrant Shares issued upon exercise of these Warrants shall survive
the exercise of these Warrants.

         7. Governing Law; Amendments and Waivers; Headings. The validity,
interpretation and performance of this Warrant Certificate and each of its terms
and provisions shall be governed by the laws of the State of Connecticut. No
provision of this Warrant Certificate may be changed, waived, discharged or
terminated except by an instrument in writing signed by the party against which
enforcement of the same is sought. The headings in this Warrant Certificate are
for purposes of reference only and shall not affect the meaning or construction
of any of the provisions hereof.

         8. Notices. Any notice or other document required or permitted to be
given or delivered to Warrant holders shall be delivered at, or sent by
certified or registered mail to each Warrant holder at, the address shown or to
such other address as shall have been furnished to the Company by such Warrant
holder. Any notice or other document required or permitted to be given or
delivered to the Company shall be delivered at, or sent by certified or
registered mail to the principal office of the Company at 35 Nutmeg Drive,
Trumbull, Connecticut 06611 Attention: Secretary, or such other address as shall
have been furnished to the Warrant holders by the Company.

         IN WITNESS WHEREOF, E-Sync Networks, Inc. has caused this Warrant
Certificate to be signed by its duly authorized officer under its corporate
seal, duly attested by its authorized officer, and to be dated as of December
22, 2000.

                                         E-SYNC NETWORKS, INC.

                                         By: /s/ Michael W.G. Fix
                                            ------------------------------------
                                               Name:  Michael W.G. Fix
                                               Title:    Chairman and CEO
<PAGE>   6
                               NOTICE OF ELECTION

                            TO: E-SYNC NETWORKS, INC.

         The undersigned, the registered holder of Warrant Cert. No. _____,
hereby irrevocably elects to exercise the purchase right represented by such
Warrant Certificate for, and to purchase thereunder, ____________________ shares
of Common Stock of E-Sync Networks, Inc. and herewith makes payment of
U.S.____________ therefor, and requests that the certificate for the Common
Stock, which will be issued in the following name, be delivered to the attention
of the undersigned at the following address:

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