
                                                                    Exhibit B


                             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.

          1. 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.

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<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.

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<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

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<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:

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<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.

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<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]


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<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





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                                  SCHEDULE A


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




                                      9


