Document:

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                                                                 Exhibit 10.1

                                VOTING AGREEMENT

                  VOTING AGREEMENT dated as of August 21, 2000, among WESTERN
PROPERTIES TRUST, a California real estate investment trust ("WESTERN"), Revenue
Properties (U.S.), Inc., a Delaware corporation ("RPUS") and Pan Pacific
Development (Nevada) Inc., a Nevada corporation and a wholly-owned subsidiary of
RPUS ("PPD").

                  WHEREAS, Western and Pan Pacific Retail Properties, Inc., a
Maryland corporation ("PAN PACIFIC"), propose to enter into an Agreement and
Plan of Merger dated as of the date hereof, substantially in the form attached
hereto as EXHIBIT A (the "MERGER AGREEMENT"; capitalized terms used but not
defined herein shall have the meanings set forth in the Merger Agreement)
providing for the merger of Western with and into Pan Pacific (the "MERGER"),
upon the terms and subject to the conditions set forth in the Merger Agreement;

                  WHEREAS, RPUS and PPD collectively own 50.86% of the
outstanding common stock, par value $.01 per share, of Pan Pacific, together
with any other shares of capital stock of Pan Pacific acquired by RPUS and PPD
after the date hereof and during the term of this Agreement (including through
the exercise of any stock options, warrants or similar instruments), being
collectively referred to herein as the "SUBJECT SHARES"); and

                  WHEREAS, as a condition to its willingness to enter into the
Merger Agreement, Western has requested that RPUS and PPD enter into this
Agreement.

                  NOW, THEREFORE, to induce Western to enter into, and in
consideration of its entering into, the Merger Agreement, and in consideration
of the promises and the representations, warranties and agreements contained
herein, the parties agree as follows:

                  1. Representations and Warranties of RPUS and PPD. RPUS and
PPD represent and warrant to Western as of the date hereof in respect of itself
as follows:

                     (a)  AUTHORITY. Each of RPUS and PPD has all requisite
power and authority to enter into this Agreement and to consummate the
transactions contemplated hereby. This Agreement has been duly authorized,
executed and delivered by RPUS and PPD and constitute a valid and binding
obligation of RPUS and PPD enforceable against RPUS and PPD in accordance
with its terms.

                     (b) THE SUBJECT SHARES. RPUS and PPD are the beneficial
owners of, and have good and valid title to, the Subject Shares, free and clear
of any liens or encumbrances whatsoever except those which impose no
restrictions on RPUS' or PPD's right to vote the Subject Shares. RPUS and PPD do
not own, of record or beneficially, any shares of capital stock of Pan Pacific
other than the Subject Shares. RPUS and PPD have the sole right to vote their
such Subject Shares, and none of such Subject Shares is subject to any voting
trust or other agreement, arrangement or restriction with respect to the voting
of such Subject Shares, except as contemplated by this Agreement. RPUS and PPD
represent that any proxies heretofore

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given in respect of RPUS' Subject Shares are not irrevocable, and that all such
proxies are hereby revoked.

                  2. REPRESENTATIONS AND WARRANTIES OF WESTERN. Western hereby
represents and warrants to RPUS and PPD that Western has all requisite corporate
power and authority to enter into this Agreement and to consummate the
transactions contemplated hereby. This Agreement has been duly authorized,
executed and delivered by Western and constitutes a valid and binding obligation
of Western enforceable against Western in accordance with its terms.

                  3. COVENANTS OF RPUS AND PPD. Until the termination of this
Agreement in accordance with Section 8, RPUS and PPD agree as follows:

                     (a) At any meeting of the stockholders of Pan Pacific
called to vote upon the Merger and the Merger Agreement, or at any annual
meeting at which such matters are voted upon, and at any adjournment thereof or
in any other circumstances upon which a vote, consent or other approval with
respect to the Merger and the Merger Agreement is sought, RPUS and PPD shall
vote (or cause to be voted) the Subject Shares in favor of the Merger, the
adoption by Pan Pacific of the Merger Agreement and the approval of the terms
thereof and each of the other transactions contemplated by the Merger Agreement.

                     (b) RPUS and PPD shall not, nor shall they permit any of
their respective directors, officers, partners, employees or agents or any
investment banker, attorney or other adviser or representative of RPUS and PPD
to, directly or indirectly, cause any of the representations set forth in
Section 1 hereof to become untrue.

                  4. GRANT OF IRREVOCABLE PROXY; ATTORNEY-IN-FACT; APPOINTMENT
OF PROXY.

                      (a) RPUS and PPD hereby irrevocably grant to, and appoint
Brad Blake and Dennis Ryan, in their capacity as officers of Western, and any
individual who shall hereafter succeed to their respective offices of Western,
and each of them individually, RPUS' and PPD's proxy and attorney-in-fact (with
full power of substitution), for and in the name, place and stead of RPUS and
PPD, to vote RPUS' and PPD's Subject Shares, or grant a consent or approval in
respect of such Subject Shares, in favor of adoption of the Merger Agreement and
the related transactions contemplated by the Merger Agreement.

                      (b) RPUS and PPD hereby affirm that the irrevocable proxy
set forth in this Section 4 is given in connection with the execution of the
Merger Agreement, and that such irrevocable proxy is given to secure the
performance of the duties of RPUS and PPD under this Agreement. RPUS and PPD
hereby further affirm that the irrevocable proxy is coupled with an interest,
and may under no circumstances be revoked. RPUS and PPD hereby ratify and
confirm all that such irrevocable proxy may lawfully do or cause to be done by
virtue hereof.

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                 5. FURTHER ASSURANCES. RPUS and PPD will, from time to
time, execute and deliver, or cause to be executed and delivered, such
additional or further consents, documents and other instruments as Western may
reasonably request for the purpose of effectively carrying out the transactions
contemplated by this Agreement.

                 6. CERTAIN EVENTS. RPUS and PPD agree that this Agreement
and the obligations hereunder shall attach to the Subject Shares and shall be
binding upon any person or entity to which legal or beneficial ownership of the
Subject Shares shall pass, whether by operation of law or otherwise, including
RPUS' and PPD's successors. In the event of any stock split, stock dividend,
merger, reorganization, recapitalization or other change in the capital
structure of Pan Pacific affecting the capital stock, or the acquisition of
additional shares of capital stock or other voting securities of Pan Pacific by
RPUS or PPD, the number of Subject Shares shall be adjusted appropriately and
this Agreement and the obligations hereunder shall attach to any additional
shares of capital stock or other voting securities of Pan Pacific issued to or
acquired by RPUS and PPD.

                 7. ASSIGNMENT. Neither this Agreement nor any of the
rights, interests or obligations hereunder shall be assigned by RPUS or PPD, on
the one hand, without the prior written consent of Western nor by Western, on
the other hand, without the prior written consent of RPUS and PPD, except that
Western may assign, in its sole discretion, any or all of its rights, interests
and obligations hereunder to any direct or indirect wholly owned subsidiary of
Western. Subject to the preceding sentence, this Agreement will be binding upon,
inure to the benefit of and be enforceable by the parties and their respective
successors and assigns.

                 8. TERMINATION. This Agreement shall terminate on the
earlier of (i) the Effective Time or (ii) the date upon which the Merger
Agreement is terminated in accordance with its terms. If the Merger Agreement is
not entered into, this document shall be of no force and effect.

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                 9. GENERAL PROVISIONS.

                    (a) AMENDMENTS. This Agreement may not be amended except
by an instrument in writing signed by each of the parties hereto.

                    (b) NOTICE. All notices and other communications
hereunder shall be in writing and shall be deemed given if delivered personally
or sent by overnight courier (providing proof of delivery) to Western in
accordance with Section 9.2 of the Merger Agreement and to RPUS and PPD at 131
Bloor Street West, Suite 300, Toronto, Ontario, Canada M5S 1R1 (or at such other
address for RPUS and PPD as shall be specified in like notice).

                    (c) INTERPRETATION. When a reference is made in this
Agreement to Sections, such reference shall be to a Section to this Agreement
unless otherwise indicated. The headings contained in this Agreement are for
reference purposes only and shall not affect in any way the meaning or
interpretation of this Agreement. Wherever the words "include," "includes" or
"including" are used in this Agreement, they shall be deemed to be followed by
the words "without limitation."

                    (d) COUNTERPARTS. This Agreement may be executed in one
or more counterparts, all of which shall be considered one and the same
agreement, and shall become effective when one or more of the counterparts have
been signed by each of the parties and delivered to the other party, it being
understood that each party need not sign the same counterpart.

                    (e) ENTIRE AGREEMENT; NO THIRD-PARTY BENEFICIARIES. This
Agreement (including the documents and instruments referred to herein) (i)
constitutes the entire agreement and supersedes all prior agreements and
understandings, both written and oral, among the parties with respect to the
subject matter hereof and (ii) is not intended to confer upon any person other
than the parties hereto any rights or remedies hereunder.

                    (f) GOVERNING LAW. This Agreement shall be governed by,
and construed in accordance with, the laws of the State of Maryland regardless
of the laws that might otherwise govern under applicable principles of conflicts
of law thereof.

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                10. SEVERABILITY. If any term or other provision of this
Agreement is invalid, illegal or incapable of being enforced by any rule or law
or public policy, all other conditions and provisions of this Agreement shall
nevertheless remain in full force and effect. Upon such determination that any
term or other provision is invalid, illegal or incapable of being enforced, the
parties hereto shall negotiate in good faith to modify this Agreement so as to
effect the original intent of the parties as closely as possible to the fullest
extent permitted by applicable law in an acceptable manner to the end that the
transactions contemplated hereby are fulfilled to the extent possible.

                            [SIGNATURE PAGE FOLLOWS.]

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                  IN WITNESS WHEREOF, Western has caused this Agreement to be
signed by its officer thereunto duly authorized and RPUS and PPD have caused
this Agreement to be signed by their respective officers thereunto duly
authorized, all as of the date first written above.

<TABLE>
<CAPTION>
<S>                             <C>

                                WESTERN PROPERTIES TRUST,
                                A CALIFORNIA REAL ESTATE INVESTMENT TRUST

                                By:   /S/ BRADLEY BLAKE
                                   --------------------------------------------
                                      Bradley Blake, Chief Executive Officer

                                By:   /S/ DENNIS RYAN
                                   --------------------------------------------
                                      Dennis Ryan, Chief Financial Officer

                                REVENUE PROPERTIES (U.S.) INC.,
                                A DELAWARE CORPORATION

                                By:   /S/ PAUL D. CAMPBELL
                                   --------------------------------------------
                                      Paul D. Campbell, President

                                By:   /S/ PAUL W. HELLEN
                                   --------------------------------------------
                                      Paul W. Hellen, Secretary

                                PAN PACIFIC DEVELOPMENT
                                (NEVADA) INC., A NEVADA CORPORATION

                                By:   /S/ PAUL D. CAMPBELL
                                   --------------------------------------------
                                      Paul D. Campbell, President

                                By:   /S/ PAUL W. HELLEN
                                   --------------------------------------------
                                      Paul W. Hellen, Secretary

</TABLE>

                    [Signature Page to the Voting Agreement]<PAGE>

                                                     EXHIBIT 10.8

                                  VASTERA, INC.
                          EMPLOYEE STOCK PURCHASE PLAN

         I.       PURPOSE OF THE PLAN

                  This Employee Stock Purchase Plan is intended to promote the
interests of Vastera, Inc., a Delaware corporation, by providing eligible
employees with the opportunity to acquire a proprietary interest in the
Corporation through participation in a payroll-deduction based employee stock
purchase plan designed to qualify under Section 423 of the Code.

                  Capitalized terms herein shall have the meanings assigned to
such terms in the attached Appendix.

                  All share numbers which appear in this Plan reflect the
three-for-two split of the Common Stock effected prior to the date of the
initial public offering.

         II.      ADMINISTRATION OF THE PLAN

                  The Plan Administrator shall have full authority to interpret
and construe any provision of the Plan and to adopt such rules and regulations
for administering the Plan as it may deem necessary in order to comply with the
requirements of Section 423 of the Code. Decisions of the Plan Administrator
shall be final and binding on all parties having an interest in the Plan.

         III.     STOCK SUBJECT TO PLAN

                  A. The stock purchasable under the Plan shall be shares of
authorized but unissued or reacquired Common Stock, including shares of Common
Stock purchased on the open market. The maximum number of shares of Common Stock
which may be issued in the aggregate under the Plan shall not exceed one million
one hundred thousand (1,100,000) shares.

                  B. The number of shares of Common Stock available for issuance
under the Plan shall automatically increase on the first trading day of January
each calendar year during the term of the Plan, beginning with calendar year
2001, by an amount equal to one percent (1%) of the total number of shares of
Common Stock outstanding on the last trading day in December of the immediately
preceding calendar year, but in no event shall any such annual increase exceed
five hundred thousand (500,000) shares.

                  C. Should any change be made to the Common Stock by reason of
any stock split, stock dividend, recapitalization, combination of shares,
exchange of shares or other change affecting the outstanding Common Stock as a
class without the Corporation's receipt of consideration, appropriate
adjustments shall be made to the maximum number and class of securities issuable
in the aggregate under the Plan, (ii) the maximum number and class of securities
by which the share reserve is to increase automatically each calendar year,
(iii) the maximum number and class of securities purchasable per Participant and
in the aggregate on any one Purchase Date and (iv) the number and class of
securities and the price per share in effect

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under each outstanding purchase right in order to prevent the dilution or
enlargement of benefits thereunder.

         IV.      OFFERING PERIODS

                  A. Shares of Common Stock shall be offered for purchase under
the Plan through a series of successive offering periods until such time as (i)
the maximum number of shares of Common Stock available for issuance under the
Plan shall have been purchased or (ii) the Plan shall have been sooner
terminated.

                  B. Each offering period shall be of such duration (not to
exceed twenty-four (24) months) as determined by the Plan Administrator prior to
the start date of such offering period. However, the initial offering period
shall commence at the Effective Time and terminate on the last business day in
July 2002. Subsequent offering periods shall commence as designated by the Plan
Administrator.

                  C. Each offering period shall be comprised of a series of one
or more successive Purchase Intervals. Purchase Intervals shall run from the
first business day in February each year to the last business day in July of the
same year and from the first business day in August each year to the last
business day in January of the following year. However, the first Purchase
Interval in effect under the initial offering period shall commence at the
Effective Time and terminate on the last business day in January 2001.

                  D. Should the Fair Market Value per share of Common Stock on
any Purchase Date within an offering period be less than the Fair Market Value
per share of Common Stock on the start date of that offering period, then that
offering period shall automatically terminate immediately after the purchase of
shares of Common Stock on such Purchase Date, and a new offering period shall
commence on the next business day following such Purchase Date. The new offering
period shall have a duration of twenty (24) months, unless a shorter duration is
established by the Plan Administrator within five (5) business days following
the start date of that offering period.

         V.       ELIGIBILITY

                  A. Each individual who is an Eligible Employee on the start
date of an offering period under the Plan may enter that offering period on such
start date or on any subsequent Semi-Annual Entry Date within that offering
period, provided he or she remains an Eligible Employee.

                  B. Each individual who first becomes an Eligible Employee
after the start date of an offering period may enter that offering period on any
subsequent Semi-Annual Entry Date within that offering period on which he or she
is an Eligible Employee.

                  C. The date an individual enters an offering period shall be
designated his or her Entry Date for purposes of that offering period.

                  D. To participate in the Plan for a particular offering
period, the Eligible Employee must complete the enrollment forms prescribed by
the Plan Administrator (including a

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stock purchase agreement and a payroll deduction authorization) and file such
forms with the Plan Administrator (or its designate) on or before his or her
scheduled Entry Date.

         VI.      PAYROLL DEDUCTIONS

                  A. The payroll deduction authorized by the Participant for
purposes of acquiring shares of Common Stock during an offering period may be
any multiple of one percent (1%) of the Cash Earnings paid to the Participant
during each Purchase Interval within that offering period, up to a maximum of
fifteen percent (15%). The deduction rate so authorized shall continue in effect
throughout the offering period, except to the extent such rate is changed in
accordance with the following guidelines:

                     (i) The Participant may, at any time during the offering
    period, reduce his or her rate of payroll deduction to become effective as
    soon as possible after filing the appropriate form with the Plan
    Administrator. The Participant may not, however, effect more than one (1)
    such reduction per Purchase Interval.

                     (ii) The Participant may, prior to the commencement of any
    new Purchase Interval within the offering period, increase the rate of his
    or her payroll deduction by filing the appropriate form with the Plan
    Administrator. The new rate (which may not exceed the fifteen percent (15%)
    maximum) shall become effective on the start date of the first Purchase
    Interval following the filing of such form.

                  B. Payroll deductions shall begin on the first pay day
administratively feasible following the Participant's Entry Date into the
offering period and shall (unless sooner terminated by the Participant) continue
through the pay day ending with or immediately prior to the last day of that
offering period. The amounts so collected shall be credited to the Participant's
book account under the Plan, but no interest shall be paid on the balance from
time to time outstanding in such account. The amounts collected from the
Participant shall not be required to be held in any segregated account or trust
fund and may be commingled with the general assets of the Corporation and used
for general corporate purposes.

                  C. Payroll deductions shall automatically cease upon the
termination of the Participant's purchase right in accordance with the
provisions of the Plan.

                  D. The Participant's acquisition of Common Stock under the
Plan on any Purchase Date shall neither limit nor require the Participant's
acquisition of Common Stock on any subsequent Purchase Date, whether within the
same or a different offering period.

         VII.     PURCHASE RIGHTS

                  A. GRANT OF PURCHASE RIGHT. A Participant shall be granted a
separate purchase right for each offering period in which he or she
participates. The purchase right shall be granted on the Participant's Entry
Date into the offering period and shall provide the Participant with the right
to purchase shares of Common Stock, in a series of successive installments over
the remainder of such offering period, upon the terms set forth below. The

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Participant shall execute a stock purchase agreement embodying such terms and
such other provisions (not inconsistent with the Plan) as the Plan Administrator
may deem advisable.

                  Under no circumstances shall purchase rights be granted under
the Plan to any Eligible Employee if such individual would, immediately after
the grant, own (within the meaning of Code Section 424(d)) or hold outstanding
options or other rights to purchase, stock possessing five percent (5%) or more
of the total combined voting power or value of all classes of stock of the
Corporation or any Corporate Affiliate.

                  B. EXERCISE OF THE PURCHASE RIGHT. Each purchase right shall
be automatically exercised in installments on each successive Purchase Date
within the offering period, and shares of Common Stock shall accordingly be
purchased on behalf of each Participant (other than Participants whose payroll
deductions have previously been refunded pursuant to the Termination of Purchase
Right provisions below) on each such Purchase Date. The purchase shall be
effected by applying the Participant's payroll deductions for the Purchase
Interval ending on such Purchase Date to the purchase of whole shares of Common
Stock at the purchase price in effect for the Participant for that Purchase
Date.

                  C. PURCHASE PRICE. The purchase price per share at which
Common Stock will be purchased on the Participant's behalf on each Purchase Date
within the offering period shall be equal to eighty-five percent (85%) of the
LOWER of (i) the Fair Market Value per share of Common Stock on the
Participant's Entry Date into that offering period or (ii) the Fair Market Value
per share of Common Stock on that Purchase Date.

                  D. NUMBER OF PURCHASABLE SHARES. The number of shares of
Common Stock purchasable by a Participant on each Purchase Date during the
offering period shall be the number of whole shares obtained by dividing the
amount collected from the Participant through payroll deductions during the
Purchase Interval ending with that Purchase Date by the purchase price in effect
for the Participant for that Purchase Date. However, the maximum number of
shares of Common Stock purchasable per Participant on any one Purchase Date
shall not exceed two thousand six hundred fifty (2,650) shares, subject to
periodic adjustments in the event of certain changes in the Corporation's
capitalization. In addition, the maximum number of shares of Common Stock
purchasable in the aggregate by all Participants on any one Purchase Date shall
not exceed two hundred seventy five thousand (275,000) shares, subject to
periodic adjustments in the event of certain changes in the corporation's
capitalization.

                  E. EXCESS PAYROLL DEDUCTIONS. Any payroll deductions not
applied to the purchase of shares of Common Stock on any Purchase Date because
they are not sufficient to purchase a whole share of Common Stock shall be held
for the purchase of Common Stock on the next Purchase Date. However, any payroll
deductions not applied to the purchase of Common Stock by reason of the
limitation on the maximum number of shares purchasable on the Purchase Date
shall be promptly refunded.

                  F. TERMINATION OF PURCHASE RIGHT. The following provisions
shall govern the termination of outstanding purchase rights:

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                     (i) A Participant may, at any time prior to the next
    scheduled Purchase Date in the offering period, terminate his or her
    outstanding purchase right by filing the appropriate form with the Plan
    Administrator (or its designate), and no further payroll deductions shall be
    collected from the Participant with respect to the terminated purchase
    right. Any payroll deductions collected during the Purchase Interval in
    which such termination occurs shall, at the Participant's election, be
    immediately refunded or held for the purchase of shares on the next Purchase
    Date. If no such election is made at the time such purchase right is
    terminated, then the payroll deductions collected with respect to the
    terminated right shall be refunded as soon as possible.

                     (ii) The termination of such purchase right shall be
    irrevocable, and the Participant may not subsequently rejoin the offering
    period for which the terminated purchase right was granted. In order to
    resume participation in any subsequent offering period, such individual must
    re-enroll in the Plan (by making a timely filing of the prescribed
    enrollment forms) on or before his or her scheduled Entry Date into that
    offering period.

                     (iii) Should the Participant cease to remain an Eligible
    Employee for any reason (including death, disability or change in status)
    while his or her purchase right remains outstanding, then that purchase
    right shall immediately terminate, and all of the Participant's payroll
    deductions for the Purchase Interval in which the purchase right so
    terminates shall be immediately refunded. However, should the Participant
    cease to remain in active service by reason of an approved unpaid leave of
    absence, then the Participant shall have the right, exercisable up until the
    last business day of the Purchase Interval in which such leave commences, to
    (a) withdraw all the payroll deductions collected to date on his or her
    behalf for that Purchase Interval or (b) have such funds held for the
    purchase of shares on his or her behalf on the next scheduled Purchase Date.
    In no event, however, shall any further payroll deductions be collected on
    the Participant's behalf during such leave. Upon the Participant's return to
    active service (i) within ninety (90) days following the commencement of
    such leave or, (ii) prior to the expiration of any longer period for which
    such Participant's right to reemployment with the Corporation is guaranteed
    by either statute or contract, his or her payroll deductions under the Plan
    shall automatically resume at the rate in effect at the time the leave
    began. However, should the Participant's leave of absence exceed ninety (90)
    days and his or her re-employment rights not be guaranteed by either statute
    or contract, then the Participant shall be treated as a new Employee for
    purposes of the Plan and must, in order to resume participation in the Plan,
    re-enroll in the Plan (by making a timely filing of the prescribed
    enrollment forms) on or before his or her scheduled Entry Date into the
    offering period.

                  G. CHANGE IN CONTROL. Each outstanding purchase right shall
automatically be exercised, immediately prior to the effective date of any
Change in Control, by applying the payroll deductions of each Participant for
the Purchase Interval in which such Change in Control occurs to the purchase of
whole shares of Common Stock at a purchase price per share equal to

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<PAGE>

eighty-five percent (85%) of the LOWER of (i) the Fair Market Value per share of
Common Stock on the Participant's Entry Date into the offering period in which
such Change in Control occurs or (ii) the Fair Market Value per share of Common
Stock immediately prior to the effective date of such Change in Control.
However, the applicable limitation on the number of shares of Common Stock
purchasable by all Participants in the aggregate shall not apply to any such
purchase.

                  The Corporation shall use its best efforts to provide at least
ten (10)-days prior written notice of the occurrence of any Change in Control,
and Participants shall, following the receipt of such notice, have the right to
terminate their outstanding purchase rights prior to the effective date of the
Change in Control.

                  H. PRORATION OF PURCHASE RIGHTS. Should the total number of
shares of Common Stock to be purchased pursuant to outstanding purchase rights
on any particular date exceed the number of shares then available for issuance
under the Plan, the Plan Administrator shall make a pro-rata allocation of the
available shares on a uniform and nondiscriminatory basis, and the payroll
deductions of each Participant, to the extent in excess of the aggregate
purchase price payable for the Common Stock pro-rated to such individual, shall
be refunded.

                  I. ASSIGNABILITY. The purchase right shall be exercisable only
by the Participant and shall not be assignable or transferable by the
Participant.

                  J. STOCKHOLDER RIGHTS. A Participant shall have no stockholder
rights with respect to the shares subject to his or her outstanding purchase
right until the shares are purchased on the Participant's behalf in accordance
with the provisions of the Plan and the Participant has become a holder of
record of the purchased shares.

         VIII.    ACCRUAL LIMITATIONS

                  A. No Participant shall be entitled to accrue rights to
acquire Common Stock pursuant to any purchase right outstanding under this Plan
if and to the extent such accrual, when aggregated with (i) rights to purchase
Common Stock accrued under any other purchase right granted under this Plan and
(ii) similar rights accrued under other employee stock purchase plans (within
the meaning of Code Section 423) of the Corporation or any Corporate Affiliate,
would otherwise permit such Participant to purchase more than Twenty-Five
Thousand Dollars ($25,000) worth of stock of the Corporation or any Corporate
Affiliate (determined on the basis of the Fair Market Value per share on the
date or dates such rights are granted) for each calendar year such rights are at
any time outstanding.

                  B. For purposes of applying such accrual limitations to the
purchase rights granted under the Plan, the following provisions shall be in
effect:

                     (i) The right to acquire Common Stock under each
    outstanding purchase right shall accrue in a series of installments on each
    successive Purchase Date during the offering period on which such right
    remains outstanding.

                     (ii) No right to acquire Common Stock under any outstanding
    purchase right shall accrue to the extent the Participant has already
    accrued in the

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<PAGE>

    same calendar year the right to acquire Common Stock under one (1) or
    more other purchase rights at a rate equal to Twenty-Five Thousand Dollars
    ($25,000) worth of Common Stock (determined on the basis of the Fair Market
    Value per share on the date or dates of grant) for each calendar year such
    rights were at any time outstanding.

                  C. If by reason of such accrual limitations, any purchase
right of a Participant does not accrue for a particular Purchase Interval, then
the payroll deductions which the Participant made during that Purchase Interval
with respect to such purchase right shall be promptly refunded.

                  D. In the event there is any conflict between the provisions
of this Article and one or more provisions of the Plan or any instrument issued
thereunder, the provisions of this Article shall be controlling.

         IX.      EFFECTIVE DATE AND TERM OF THE PLAN

                  A. The Plan was adopted by the Board on April 4, 2000 and
shall become effective at the Effective Time, PROVIDED no purchase rights
granted under the Plan shall be exercised, and no shares of Common Stock shall
be issued hereunder, until (i) the Plan shall have been approved by the
stockholders of the Corporation and (ii) the Corporation shall have complied
with all applicable requirements of the 1933 Act (including the registration of
the shares of Common Stock issuable under the Plan on a Form S-8 registration
statement filed with the Securities and Exchange Commission), all applicable
listing requirements of any stock exchange (or the Nasdaq National Market, if
applicable) on which the Common Stock is listed for trading and all other
applicable requirements established by law or regulation. In the event such
stockholder approval is not obtained, or such compliance is not effected, within
twelve (12) months after the date on which the Plan is adopted by the Board, the
Plan shall terminate and have no further force or effect, and all sums collected
from Participants during the initial offering period hereunder shall be
refunded.

                  B. Unless sooner terminated by the Board, the Plan shall
terminate upon the EARLIEST of (i) the last business day in April 2010, (ii) the
date on which all shares available for issuance under the Plan shall have been
sold pursuant to purchase rights exercised under the Plan or (iii) the date on
which all purchase rights are exercised in connection with a Corporate
Transaction. No further purchase rights shall be granted or exercised, and no
further payroll deductions shall be collected, under the Plan following such
termination.

         X.       AMENDMENT/TERMINATION OF THE PLAN

                  A. The Board may alter, amend, suspend or terminate the Plan
at any time to become effective immediately following the close of any Purchase
Interval. However, the Plan may be amended or terminated immediately upon Board
action, if and to the extent necessary to assure that the Corporation will not
recognize, for financial reporting purposes, any compensation expense in
connection with the shares of Common Stock offered for purchase under the Plan,
should the financial accounting rules applicable to the Plan at the Effective
Time

                                       7
<PAGE>

be subsequently revised so as to require the recognition of compensation expense
in the absence of such amendment or termination.

                  B. In no event may the Board effect any of the following
amendments or revisions to the Plan without the approval of the Corporation's
stockholders: (i) increase the number of shares of Common Stock issuable under
the Plan, except for permissible adjustments in the event of certain changes in
the Corporation's capitalization, (ii) alter the purchase price formula so as to
reduce the purchase price payable for the shares of Common Stock purchasable
under the Plan or (iii) modify eligibility requirements for participation in the
Plan.

         XI.      GENERAL PROVISIONS

                  A. Nothing in the Plan shall confer upon the Participant any
right to continue in the employ of the Corporation or any Corporate Affiliate
for any period of specific duration or interfere with or otherwise restrict in
any way the rights of the Corporation (or any Corporate Affiliate employing such
person) or of the Participant, which rights are hereby expressly reserved by
each, to terminate such person's employment at any time for any reason, with or
without cause.

                  B. All costs and expenses incurred in the administration of
the Plan shall be paid by the Corporation; however, each Plan Participant shall
bear all costs and expenses incurred by such individual in the sale or other
disposition of any shares purchased under the Plan.

                  C. The provisions of the Plan shall be governed by the laws of
the State of Virginia without regard to that State's conflict-of-laws rules.

                                       8
<PAGE>

                                   SCHEDULE A

                          CORPORATIONS PARTICIPATING IN
                          EMPLOYEE STOCK PURCHASE PLAN
                            AS OF THE EFFECTIVE TIME

                                  Vastera, Inc.

<PAGE>

                                    APPENDIX

                  The following definitions shall be in effect under the Plan:

                  A. BOARD shall mean the Corporation's Board of Directors.

                  B. CASH EARNINGS shall mean the (i) base salary payable to a
Participant by one or more Participating Corporations during such individual's
period of participation in one or more offering periods under the Plan plus (ii)
all overtime payments, bonuses, commissions, current profit-sharing
distributions and other incentive-type payments. Such Cash Earnings shall be
calculated before deduction of (A) any income or employment tax withholdings or
(B) any pre-tax contributions made by the Participant to any Code Section 401(k)
salary deferral plan or any Code Section 125 cafeteria benefit program now or
hereafter established by the Corporation or any Corporate Affiliate. However,
Cash Earnings shall NOT include any contributions (other than Code Section
401(k) or Code Section 125 contributions) made on the Participant's behalf by
the Corporation or any Corporate Affiliate to any employee benefit or welfare
plan now or hereafter established.

                  C. CHANGE IN CONTROL shall mean a change in ownership of the
Corporation pursuant to any of the following transactions:

                     (i) a merger or consolidation in which securities
    possessing more than fifty percent (50%) of the total combined voting power
    of the Corporation's outstanding securities are transferred to a person or
    persons different from the persons holding those securities immediately
    prior to such transaction, or

                     (ii) the sale, transfer or other disposition of all or
    substantially all of the assets of the Corporation in complete liquidation
    or dissolution of the Corporation, or

                     (iii) the acquisition, directly or indirectly, by a person
    or related group of persons (other than the Corporation or a person that
    directly or indirectly controls, is controlled by or is under common control
    with the Corporation) of beneficial ownership (within the meaning of Rule
    13d-3 of the 1934 Act) of securities possessing more than fifty percent
    (50%) of the total combined voting power of the Corporation's outstanding
    securities pursuant to a tender or exchange offer made directly to the
    Corporation's stockholders.

                  D. CODE shall mean the Internal Revenue Code of 1986, as
amended.

                  E. COMMON STOCK shall mean the Corporation's common stock.

                  F. CORPORATE AFFILIATE shall mean any parent or subsidiary
corporation of the Corporation (as determined in accordance with Code Section
424), whether now existing or subsequently established.

                                      A-1
<PAGE>

                  G. CORPORATION shall mean Vastera, Inc., a Delaware
corporation, and any corporate successor to all or substantially all of the
assets or voting stock of Vastera, Inc. which shall by appropriate action adopt
the Plan.

                  H. EFFECTIVE TIME shall mean the time at which the
Underwriting Agreement is executed. Any Corporate Affiliate which becomes a
Participating Corporation after such Effective Time shall designate a subsequent
Effective Time with respect to its employee-Participants.

                  I. ELIGIBLE EMPLOYEE shall mean any person who is employed by
a Participating Corporation on a basis under which he or she is regularly
expected to render more than twenty (20) hours of service per week for more than
five (5) months per calendar year for earnings considered wages under Code
Section 3401(a).

                  J. ENTRY DATE shall mean the date an Eligible Employee first
commences participation in the offering period in effect under the Plan. The
earliest Entry Date under the Plan shall be the Effective Time.

                  K. FAIR MARKET VALUE per share of Common Stock on any relevant
date shall be determined in accordance with the following provisions:

                     (i) If the Common Stock is at the time traded on the Nasdaq
    National Market, then the Fair Market Value shall be the closing selling
    price per share of Common Stock on the date in question, as such price is
    reported by the National Association of Securities Dealers on the Nasdaq
    National Market or any successor system. If there is no closing selling
    price for the Common Stock on the date in question, then the Fair Market
    Value shall be the closing selling price on the last preceding date for
    which such quotation exists.

                     (ii) If the Common Stock is at the time listed on any Stock
    Exchange, then the Fair Market Value shall be the closing selling price per
    share of Common Stock on the date in question on the Stock Exchange
    determined by the Plan Administrator to be the primary market for the Common
    Stock, as such price is officially quoted in the composite tape of
    transactions on such exchange. If there is no closing selling price for the
    Common Stock on the date in question, then the Fair Market Value shall be
    the closing selling price on the last preceding date for which such
    quotation exists.

                     (iii) For purposes of the initial offering period which
    begins at the Effective Time, the Fair Market Value shall be deemed to be
    equal to the price per share at which the Common Stock is sold in the
    initial public offering pursuant to the Underwriting Agreement.

                  L. 1933 ACT shall mean the Securities Act of 1933, as amended.

                  M. PARTICIPANT shall mean any Eligible Employee of a
Participating Corporation who is actively participating in the Plan.

                                      A-2
<PAGE>

                  N. PARTICIPATING CORPORATION shall mean the Corporation and
such Corporate Affiliate or Affiliates as may be authorized from time to time by
the Board to extend the benefits of the Plan to their Eligible Employees. The
Participating Corporations in the Plan are listed in attached Schedule A.

                  O. PLAN shall mean the Corporation's Employee Stock Purchase
Plan, as set forth in this document.

                  P. PLAN ADMINISTRATOR shall mean the committee of two (2) or
more Board members appointed by the Board to administer the Plan.

                  Q. PURCHASE DATE shall mean the last business day of each
Purchase Interval. The initial Purchase Date shall be January 31, 2001.

                  R. PURCHASE INTERVAL shall mean each successive six (6)-month
period within the offering period at the end of which there shall be purchased
shares of Common Stock on behalf of each Participant.

                   S. SEMI-ANNUAL ENTRY DATE shall mean the first business day
in February and August each year on which an Eligible Employee may first enter
an offering period.

                   T. STOCK EXCHANGE shall mean either the American Stock
Exchange or the New York Stock Exchange.

                   U. UNDERWRITING AGREEMENT shall mean the agreement between
the Corporation and the underwriter or underwriters managing the Corporation's
initial public offering of its Common Stock.

                                      A-3

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