<PAGE>



                              AMENDED AND RESTATED
                           CONVERTIBLE PROMISSORY NOTE


$3,500,000.00                                                    August 12, 2002


                  FOR VALUE RECEIVED, @POS.COM, INC., a corporation organized
under the laws of the State of Delaware ("POS"), and CROSSVUE, INC., a
corporation organized under the laws of the State of Delaware ("Crossvue") (POS
and Crossvue hereafter individually referred to as a "Borrower" and collectively
referred to as the "Borrowers"), hereby jointly and severally promise to pay to
the order of SYMBOL TECHNOLOGIES, INC., a corporation organized under the laws
of the State of Delaware ("Lender"), the principal sum of Three Million Five
Hundred Thousand Dollars ($3,500,000.00), or such lesser amount as is equal to
the aggregate outstanding principal amount of all Loans made to Borrowers by
Lender from time to time, plus the amount of liquidated damages, if any, payable
under Section 10.3(b) of the Merger Agreement referred to below, together with
interest at the rate specified herein. This Amended and Restated Convertible
Promissory Note (this "Note") amends and restates in its entirety the
Convertible Promissory Note dated as of June 26, 2002 (the "Old Note") executed
by the Borrowers in favor of Lender and the Old Note shall forthwith be
terminated and cease to have further force and effect.

                  Definitions. Whenever used in this Note, the following
capitalized terms shall have the meanings set forth below:

                  "Closing" shall mean a closing of the Merger under the Merger
Agreement.

                  "Common Stock" shall mean shares of common stock of POS.

                  "Event of Default" shall mean any of the events specified in
Section 10 of this Note.

                  "Loan" shall mean each advance made by Lender to Borrowers
under this Promissory Note.

                  "Maturity Date" shall mean December 31, 2002.

                  "Merger" shall have the meaning set forth for such term in the
Merger Agreement.

                  "Merger Agreement" shall mean the Agreement and Plan of Merger
dated August 9, 2002 entered into by and among POS, Symbol Acquisition Corp. and
Lender.

                  "Person" shall mean any individual, firm, corporation,
partnership, limited liability company, incorporated or unincorporated
association, joint venture, joint stock company or other entity of any kind.


<PAGE>



                  "Security Agreement" shall have the meaning set forth in
Section 7 below.

                  "Subsidiary" shall mean, as to any Person, a corporation,
partnership or other entity of which shares of capital stock having ordinary
voting power to elect a majority of the board of directors or other managers of
such corporation, partnership or other entity are at the time owned, or the
management of which is otherwise controlled, directly or indirectly through one
or more intermediaries, or both, by such Person.

                  "Termination Date" shall mean the earlier of (a) the date of
the Closing of the Merger and (b) the date the Merger Agreement is terminated
for any reason.

                  2.  Loans.

                  (a) So long as no Event of Default has occurred and is
continuing, Borrowers may at any time and from time to time prior to the
Termination Date request from Lender one or more Loans in an amount up to but
not exceeding in the aggregate at any one time outstanding the sum of $3,500,000
(including amounts borrowed under the Old Note).

                  (b) Under the Old Note, loans in an aggregate amount of
$400,000 have been made and such loans plus accrued and unpaid interest therein
shall be deemed to be outstanding Loans under this Note. A Loan of $1,157,945.23
shall be made when the Borrowers execute and deliver this Note, the Security
Agreement and the other collateral documents required to be delivered under the
Security Agreement and the Borrowers shall use the proceeds of such Loan to pay
in full the outstanding loans and other obligations under the Convertible
Promissory Note dated as of June 25, 2002 executed by Borrowers in favor of Hand
Held Products, Inc. After the date hereof, Borrowers shall give Lender prior
written or oral notice of each subsequent Loan requested hereunder, specifying
the amount and date of each Loan. Borrowers may not request more than one Loan
in any calendar week and each such request may not exceed $200,000 (or any
higher amount to the extent that Lender consents, in its sole discretion, to
such amount). Each request for a Loan shall be accompanied by a written cash
flow projection setting forth the current cash position of Borrowers (which for
these purposes shall include the amount of any cash prepayment made by Federated
Department Stores less an amount needed by Borrowers to purchase parts inventory
specifically for the Federated contract) and the current cash needs of Borrowers
for the following week (showing the amount of anticipated expenditures by
general category) in order to allow Borrowers to operate in the ordinary course
of business. If the weekly cash flow statement shows a projected cash flow
deficit, Lender will, prior to the Termination Date, make a Loan to Borrowers in
the amount of the deficit up to a maximum of $200,000 per week (or any higher
amount to the extent that Lender consents, in its sole discretion, to such
amount). The proceeds of the Loan shall be made available to Borrowers to such
account or accounts as Borrowers may designate.




                                       2
<PAGE>



                  (c) Upon the making of Loans and the receipt of any payments
on Loans made hereunder, Lender is authorized to endorse the attached Schedule A
with an appropriate notation or to make appropriate notations on Lender's books
and records, provided that the failure to make any such notation (or any error
therein) shall not affect the obligations of the Borrowers to repay the Loans
made under this Note. Such notations made by Lender shall be conclusive evidence
of all loans and payments made hereunder absent manifest error.

                  3.  Interest.

                  (a) The outstanding principal balance of this Note shall bear
interest at a rate of 10% per annum. In the event this Note is not paid on the
Maturity Date or following an Event of Default, the outstanding principal
balance of this Note shall bear interest at a rate of 15% per annum following
such date.

                  (b) Interest shall be calculated on the basis of a 365-day
year for the actual number of days elapsed. Interest on the principal amount of
all outstanding Loans shall be payable in arrears on the first day of each month
and if not so paid shall be added to the principal balance monthly.

                  4. Principal. The principal balance of this Note shall be paid
on the Maturity Date. Borrowers may prepay this Note in whole or in part at any
time without premium or penalty. Borrowers shall make a mandatory prepayment of
the outstanding principal balance of this Note, and any accrued and unpaid
interest hereon, on the date on which either Borrower or POS's stockholders
enter into a transaction with a Person other than Lender which involves (i) a
merger or consolidation of either Borrower with another Person or the transfer
of any portion of the outstanding capital stock or assets to another Person or
(ii) a debt or equity financing by either Borrower; provided that, in the event
the financing does not raise proceeds (net of costs and expenses of the
financing transaction) equal to or in excess of $3,500,000, the mandatory
prepayment shall be limited in an amount to 50% of the net proceeds raised in
such financing transaction.

                  5.  Adjustment of Principal Amount.

                  (a) The outstanding principal balance of this Note shall be
reduced by $350,000 in the event Lender becomes obligated to pay liquidated
damages to Borrowers under Section 10.3(c) of the Merger Agreement following a
termination of the Merger Agreement for one of the reasons specified in Section
10.3(c). In such event, Borrowers shall be deemed to have offset the amount of
the liquidated damages owed by Lender against the outstanding balance hereof.

                  (b) The outstanding principal balance of this Note shall be
increased by $350,000 in the event Borrowers become obligated to pay liquidated
damages to Lender under Section 10.3(b) of the Merger Agreement following a
termination of the Merger Agreement for one of the reasons specified in Section
10.3(b). In such event, Borrowers shall be deemed to have requested and received
an additional Loan in the amount of $350,000.



                                       3
<PAGE>


                  6. Payments. All payments due under or pursuant to this Note
shall be made when due at such address as Lender may designate in writing from
time to time, in lawful money of the United States of America.

                  7. Collateral. This Note is secured by a security interest in
substantially all the assets of Borrowers granted pursuant to a Security
Agreement dated the date hereof (the "Security Agreement"). Upon the occurrence
of an Event of Default, Lender shall have all the rights and remedies set forth
in the Security Agreement.

                  8.  Conversion.

                  (a) Lender may at any time before or after the occurrence of
an Event of Default convert all or a portion of the unpaid principal balance of
this Note (including accrued and unpaid interest) into such number of shares of
Common Stock of POS as is equal to the product of (A) a fraction, the numerator
of which is the then-outstanding balance of this Note (including accrued and
unpaid interest) and the denominator of which is $5,000,000, and (B) the number
of shares of Common Stock outstanding on a fully diluted basis, including,
without limitation, shares of Common Stock issuable pursuant to (i) any
outstanding rights, options or warrant to subscribe for, purchase or otherwise
acquire shares of Common Stock or securities convertible into Common Stock and
(ii) outstanding indebtedness, shares or other securtities convertible into or
exchangeable for Common Stock.

                  (b) If Lender desires to convert this Note into shares of
Common Stock, Lender shall surrender this Note and shall give written notice to
POS that Lender elects to convert the same. POS shall, as soon as practicable
thereafter, issue and deliver to Lender, a certificate or certificates for the
number of shares of Common Stock to which Lender shall be entitled. Such
conversion shall be deemed to have been made immediately prior to the close of
business on the date of surrender of this Note, and Lender shall be treated for
all purposes as the record holder of such shares of Common Stock on such date.
If Lender elects to convert less than the entire outstanding balance of this
Note, Borrowers shall issue a replacement promissory note for the balance which
is not converted.

                  (c) POS will not, by amendment of its certificate of
incorporation or through any 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 hereunder by POS, but will at all times in good faith
assist in the carrying out of all the provisions of this Section 8 and in the
taking of all such action as may be necessary or appropriate in order to protect
the conversion rights of Lender against impairment.

                  (d) In the event of any taking by POS of a record of the
holders of any class of securities for the purpose of determining the holders
thereof who are entitled to (i) receive any dividend or other distribution, any
security or right convertible into or entitling the holder thereof to receive
additional shares of Common Stock, (ii) receive any right to subscribe for,
purchase or otherwise acquire any shares of stock of any class or any other
securities or property, or to receive any other right, or (iii) approve any
transfer of assets, consolidation, merger, dissolution



                                       4
<PAGE>


or other reorganization, Borrowers shall mail to Lender at least twenty (20)
days prior to the date specified therein, a notice specifying the date on which
any such record is to be taken for the purpose of such dividend, distribution,
security, or right, and the amount and character of such dividend, distribution,
security or right.

                  (e) POS shall pay any and all issue and other taxes (except
taxes measured by the net income of Lender) that may be payable in respect of
any issue or delivery of shares of Common Stock on conversion of this Note
pursuant hereto.

                  (f) POS shall at all times reserve and keep available out of
its authorized but unissued shares of Common Stock, solely for the purpose of
effecting the conversion of this Note, such number of its shares of Common Stock
as shall from time to time be sufficient to effect the conversion of this Note.
If at any time the number of authorized but unissued shares of Common Stock
shall not be sufficient to effect the conversion of this Note, POS will take
such corporate action as may be necessary to increase its authorized but
unissued shares of Common Stock to such number of shares as shall be sufficient
for such purpose, including, without limitation, engaging in best efforts to
obtain the requisite stockholder approval of any necessary amendment to its
certificate of incorporation.

                  (g) In case of any reorganization or any reclassification of
the capital stock of POS, any consolidation or merger of POS with or into
another Person, or the conveyance of all or substantially all of the assets of
POS to another Person, this Note shall thereafter be convertible into the number
of shares of stock or other securities or property (including cash) which a
holder of the number of shares of Common Stock deliverable upon conversion of
this Note would have been entitled upon the record date of (or date of, if no
record date is fixed) such reorganization, reclassification, consolidation,
merger or conveyance; and, in any case, appropriate adjustment shall be made in
the application of the provisions herein set forth with respect to the rights
and interests thereafter of Lender, to the end that the provisions set forth
herein shall thereafter be applicable, as nearly as equivalent as is
practicable, in relation to any shares of stock or the securities or property
(including cash) thereafter deliverable upon the conversion of this Note.

                  9. Representations and Warranties. The Borrowers jointly and
severally represent and warrant as follows:

                  (a) Borrowers have the corporate power and authority to
execute and deliver this Note and to incur the indebtedness evidenced hereby;

                  (b) The execution, delivery and performance of this Note have
been duly and validly authorized by all requisite corporate action on behalf of
the Borrowers.

                  (c) This Note constitutes the legal, valid and binding
obligation of Borrowers, enforceable against Borrowers in accordance with its
terms.

                  10. Events of Default. The occurrence of any of the following
events shall constitute an Event of Default under this Note:



                                       5
<PAGE>



                  (a) Borrowers fail to make payment of any amounts owing under
this Note when due other than payments of interest due prior to the Maturity
Date;

                  (b) A Borrower fails to comply with, perform or observe any
other covenant or agreement contained in this Note or the Security Agreement and
such failure shall not be cured within 30 days after written notice thereof;

                  (c) Any representation or warranty made or given by Borrowers
in this Note or in the Security Agreement proves to be false or misleading in
any material respect;

                  (d) A judgment shall be entered against any Borrower which is
not satisfied, vacated, bonded or stayed within 30 days after entry thereof;

                  (e) (i) Any Borrower or any of its Subsidiaries shall commence
any case, proceeding or other action (A) under any existing or future law of any
jurisdiction, domestic or foreign, relating to bankruptcy, insolvency,
reorganization or relief of debtors, seeking to have an order for relief entered
with respect to it, or seeking to adjudicate it a bankrupt or insolvent, or
seeking reorganization, arrangement, adjustment, winding-up, liquidation,
dissolution, composition or other relief with respect to it or its debts, or (B)
seeking appointment of a receiver, trustee, custodian, conservator or other
similar official for it or for all or any substantial part of its assets, or any
Borrower or any of its Subsidiaries shall make a general assignment for the
benefit of its creditors; or (ii) there shall be commenced against any Borrower
or any of its Subsidiaries any case, proceeding or other action of a nature
referred to in clause (i) above which (A) results in the entry of an order for
relief or any such adjudication or appointment or (B) remains undismissed,
undischarged or unbonded for a period of 30 days; or (iii) there shall be
commenced against any Borrower or any of its Subsidiaries any case, proceeding
or other action seeking issuance of a warrant of attachment, execution,
distraint or similar process against all or any substantial part of its assets
which results in the entry of an order for any such relief which shall not have
been vacated, discharged or stayed or bonded pending appeal within 60 days from
the entry thereof; or (iv) any Borrower or any of its Subsidiaries shall take
any action in furtherance of, or indicating its consent to, approval of, or
acquiescence in, any of the acts set forth in clause (i), (ii), or (iii) above;
or (v) any Borrower or any of its Subsidiaries shall admit in writing its
inability to pay its debts as they become due.

                  Upon the occurrence of one of the events specified in clauses
(a) through (d), all amounts due under this Note may, at Lender's option, be
accelerated and declared payable in full. Upon the occurrence of one of the
events specified in clause (e), all amounts due under this Note shall
automatically be accelerated and become payable in full. Borrowers shall no
longer be authorized to request additional Loans hereunder following the
occurrence of any Event of Default.

                  11. Waiver of Protest. Borrowers hereby waive presentment,
protest, demand, notice of dishonor or default, and notice of any kind except as
herein required with respect to this Note or the performance of their
obligations under this Note.



                                       6
<PAGE>


                  12. Waiver; Amendment. No delay or omission by Lender in
enforcing or exercising any right hereunder shall operate as a waiver of such
right or of any other right under this Note. A waiver on any one occasion shall
not be construed as a waiver of any right or remedy on any future occasion. This
Note may not be amended except as Lender may consent thereto in writing duly
signed for and on its behalf.

                  13. Governing Law. This Note shall be governed by, and
construed in accordance with, the laws of the State of New York without giving
effect to principles of conflicts of law.

                  14. Jurisdiction. Each Borrower hereby irrevocably and
unconditionally:

                   (a) submits for itself and its property in any legal action
or proceeding relating to this Note, or for recognition and enforcement of any
judgment in respect hereof, to the non-exclusive general jurisdiction of all
federal and state courts located in the State of Delaware, and appellate courts
from any hereof;

                  (b) consents that any such action or proceeding may be brought
in such courts, and waives any objection that the Borrower may now or hereafter
have to the venue of any such action or proceeding in any such court or that
such action or proceeding was brought in an inconvenient court and agrees not to
plead or claim the same;

                  (c) agrees that service of process in any such action or
proceeding may be effected by mailing a copy thereof by registered or certified
mail (or any substantially similar form of mail) postage prepaid, to the
Borrower at its address set forth above or at such other address of which the
Lender shall have been notified by Borrower;

                  (d) agrees that nothing herein shall affect the right of the
Lender to effect service of process in any other manner permitted by law or
shall limit the right of the Lender to commence appropriate legal proceedings to
enforce its rights under this Note in any other jurisdiction; and

                  (e) waives all right to trial by jury in any action,
proceeding or counterclaim arising out of or in connection with this Note.


                  [Remainder of page intentionally left blank]


                                       7
<PAGE>



                  IN WITNESS WHEREOF, the Borrowers have executed this
Convertible Promissory Note as of the date first set forth above.


                                       @POS.COM, INC.


                                       By:     /s/ John Wood
                                         -------------------------------------
                                           Title:  CEO


                                       CROSSVUE, INC.


                                       By:     /s/ Llavan Fernando
                                          ------------------------------------
                                           Title:  President / CEO


Acknowledged and accepted:

SYMBOL TECHNOLOGIES, INC.


By:      /s/ Leonard Goldner
    -----------------------------------------
      Title:  Executive Vice President and
              General Counsel





                                       8
<PAGE>




                                   SCHEDULE A




                    AMOUNT OF           AMOUNT OF           UNPAID PRINCIPAL
        DATE          LOAN         PRINCIPAL PAYMENT            BALANCE
      ---------   ------------   ---------------------    --------------------


















                                       9





