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

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

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

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

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

LOAN NUMBER LOAN NAME ACCT. NUMBER NOTE DATE INITIALS  
WidePoint Corporation   08/16/07  
NOTE AMOUNT INDEX (w/Margin) RATE MATURITY DATE LOAN PURPOSE
$2,000,000.00 Wall Street Journal 8.0% 09/01/08 Commercial   Prime minus 0.25%  
       
Creditor Use Only    

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

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

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

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

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

PROMISSORY NOTE
(Commercial — Revolving Draw — Variable Rate)

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

DATE AND PARTIES. The date of this Promissory Note (Note) is August 16, 2007.
The parties and their addresses are:

  LENDER:

  CARDINAL BANK
8270 Greensboro Drive
Suite 500
McLean, Virginia 22102
Telephone: (703) 584-3430

  BORROWER:

  WIDEPOINT CORPORATION
a Delaware Corporation
One Lincoln Centre
18W140 Butterfield Road, Suite 1100
Oakbrook Terrace, Illinois 60181

  WIDEPOINT IL, INC.
an Illinois Corporation
One Lincoln Centre
18W140 Butterfield Road, Suite 1100
Oakbrook Terrace, Illinois 60181

  WP NBIL, INC.
an Illinois Corporation
One Lincoln Centre
18W140 Butterfield Road, Suite 1100
Oakbrook Terrace, Illinois 60181

  CHESAPEAKE GOVERNMENT TECHNOLOGIES, INC.
a Delaware Corporation
One Lincoln Centre
18W140 Butterfield Road, Suite 1100
Oakbrook Terrace, Illinois 60181

  OPERATIONAL RESEARCH CONSULTANTS, INC.
a Virginia Corporation
11250 Waples Mills, South Tower
Suite 250
Fairfax, Virginia 22030

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

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

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

WidePoint Corporation     Virginia Promissory Note   Initials ______ 
VA/4HancockD00725200004266019080607N -1996 Bankers Systems, Inc., St. Cloud, MN
C Page 1

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

CONFESSION OF JUDGMENT. I appoint and authorize Neil I. Title and Julian
Karpoff, either of whom may act alone, 1840 Wilson Boulevard, #205, Arlington,
VA 22201, attorneys in fact, to appear in the office of Arlington County Circuit
Court, Virginia, to confess judgment against me, in favor of you, if I default
on this agreement. The confession of judgment may be without process and ONLY
for any amount of PRINCIPAL and INTEREST due on this Note. However, it being
understood that the confession of judgement shall only be effective in such
event that Borrower would be in default under this agreement, the Commercial
Loan Agreement, or any other agreement related to or securing the indebtedness
evidenced herein; and it being further understood that said default would be
subject to written notification by Lender to Borrower, and further subject to
any response period specified and allowed by Lender within said notification.

In this notice, “you” means the Borrower. IMPORTANT NOTICE: THIS INSTRUMENT
CONTAINS A CONFESSION OF JUDGMENT WHICH CONSTITUTES A WAIVER OF IMPORTANT RIGHTS
YOU MAY HAVE AS A DEBTOR AND ALLOWS THE CREDITOR TO OBTAIN A JUDGMENT AGAINST
YOU WITHOUT ANY FURTHER NOTICE.

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

1.        DEFINITIONS. As used in this Note, the terms have the following
meanings:

  A.         Pronouns. The pronouns “I,” “me,” and “my” refer to each Borrower
signing this Note, individually and together with their heirs, successors and
assigns, and each other person or legal entity (including guarantors, endorsers,
and sureties) who agrees to pay this Note. “You” and “Your” refer to the Lender,
with its participants or syndicators, successors and assigns, or any person or
company that acquires an interest in the Loan.

  B.         Note. Note refers to this document, and any extensions, renewals,
modifications and substitutions of this Note.

  C.         Loan. Loan refers to this transaction generally, including
obligations and duties arising from the terms of all documents prepared or
submitted for this transaction such as applications, security agreements,
disclosures or notes, and this Note.

  D.         Property. Property is any property, real, personal or intangible,
that secures my performance of the obligations of this Loan.

  E.         Percent. Rates and rate change limitations are expressed as
annualized percentages.

2.         PROMISE TO PAY. For value received, I promise to pay you or your
order, at your address, or at such other location as you may designate, amounts
advanced from time to time under the terms of this Note up to the maximum
outstanding principal balance, the lesser of $2,000,000.00 (Principal) or the
Borrowing Base, plus interest from the date of disbursement, on the unpaid
outstanding Principal balance until this Note matures or this obligation is
accelerated.

I may borrow up to the Principal amount more than one time.

All advances made will be made subject to all other terms and conditions of this
Loan.

3.         INTEREST. Interest will accrue on the unpaid Principal balance of
this Note at the rate of 8.0 percent (Interest Rate) until August 17, 2007,
after which time it may change as described in the Variable Rate subsection.

  A.         Interest After Default. If you declare a default under the terms of
this Loan, including for failure to pay in full at maturity, you may increase
the Interest Rate payable on the outstanding Principal balance of this Note. In
such event, interest will accrue on the outstanding Principal balance at the
variable Interest Rate in effect from time to time, plus an additional 2.000
percent, until paid in full.

  B.         Maximum Interest Amount. Any amount assessed or collected as
interest under the terms of this Note or obligation will be limited to the
Maximum Lawful Amount of interest allowed by state or federal law. Amounts
collected in excess of the Maximum Lawful Amount will be applied first to the
unpaid Principal balance. Any remainder will be refunded to me.

  C.         Statutory Authority. The amount assessed or collected on this Note
is authorized by the Virginia usury laws under Va. Code §§ 6.1-330.49 et. seq.

  D.         Accrual. During the scheduled term of this Loan interest accrues
using an Actual/360 days counting method.

  E.         Variable Rate. The Interest Rate may change during the term of this
transaction.

  (1)        Index. Beginning with the first Change Date, the Interest Rate will
be based on the following index: the Prime rate as published in the Money Rate
Section of the Wall Street Journal. When a range of rates have been published,
the highest rate will be used.

  The Current Index is the most recent index figure available on each Change
Date. You do not guaranty by selecting this Index, or the margin, that the
Interest Rate on this Note will be the same rate you charge on any other loans
or class of loans you make to me or other borrowers. If this Index is no longer
available, you will substitute a similar index. You will give me notice of your
choice.

  (2)        Change Date. Each date on which the Interest Rate may change is
called a Change Date. The Interest Rate may change August 17, 2007 and daily
thereafter.

  (3)        Calculation Of Change. On each Change Date, you will calculate the
Interest Rate, which will be the Current Index minus 0.25 percent. The result of
this calculation will be rounded to the nearest .001 percent. Subject to any
limitations, this will be the Interest Rate until the next Change Date. The new
Interest Rate will become effective on each Change Date. The Interest Rate and
other charges on this Note will never exceed the highest rate or charge allowed
by law for this Note.

  (4)        Effect Of Variable Rate. A change in the Interest Rate will have
the following effect on the payments: The amount of scheduled payments will
change.

4.         ADDITIONAL CHARGES. As additional consideration, I agree to pay, or
have paid, the fees and charges listed on the APPENDIX: FEES AND CHARGES, which
is attached to and made part of this Note. I understand and agree that some
payments to third parties as part of this transaction may also involve money
retained by you or paid back to you as commissions or other remuneration.

5.         REMEDIAL CHARGES. In addition to interest or other finance charges, I
agree that I will pay these additional fees based on my method and pattern of
payment. Additional remedial charges may be described elsewhere in this Note.

  A.         Late Charge. If a payment is more than 10 days late, I will be
charged 5.000 percent of the Unpaid Portion of Payment. I will pay this late
charge promptly but only once for each late payment.

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

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

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

WidePoint Corporation     Virginia Promissory Note   Initials ______ 
VA/4HancockD00725200004266019080607N -1996 Bankers Systems, Inc., St. Cloud, MN
C Page 2

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

  B.         Returned Check Charge. I agree to pay a fee not to exceed $32.00
for each check, negotiable order of withdrawal or draft I issue in connection
with this Loan that is returned because it has been dishonored.

  C.         Stop Payment. A(n) Stop Payment equal to $30.00.

6.         GOVERNING AGREEMENT. This Note is further governed by the Commercial
Loan Agreement executed between you and me as part of this Loan, as modified,
amended or supplemented. Upon execution of this Note, I represent that I have
reviewed and am in compliance with the terms contained in the Commercial Loan
Agreement.

7.         PAYMENT. I agree to pay this Note on demand, but if no demand is
made, I agree to pay all accrued interest on the balance outstanding from time
to time in regular payments beginning September 1, 2007, then on the same day of
each month thereafter. Any payment scheduled for a date falling beyond the last
day of the month, will be due on the last day. A final payment of the entire
unpaid outstanding balance of Principal and interest will be due September 1,
2008.

Payments will be rounded to the nearest $.01. With the final payment I also
agree to pay any additional fees or charges owing and the amount of any advances
you have made to others on my behalf. Payments scheduled to be paid on the 29th,
30th or 31st day of a month that contains no such day will, instead, be made on
the last day of such month.

Interest payments will be applied first to any charges I owe other than late
charges, then to accrued, but unpaid interest, then to late charges. Principal
payments will be applied first to the outstanding Principal balance, then to any
late charges. If you and I agree to a different application of payments, we will
describe our agreement on this Note. The actual amount of my final payment will
depend on my payment record.

8.         PREPAYMENT. I may prepay this Loan in full or in part at any time.
Any partial prepayment will not excuse any later scheduled payments until I pay
in full.

9.         LOAN PURPOSE. The purpose of this Loan is working capital line of
credit.

10.         SECURITY. This Loan is secured by separate security instruments
prepared together with this Note as follows:

Document Name Parties to Document
Security Agreement - WidePoint Corporation WidePoint Corporation

11.         ASSUMPTIONS. Someone buying the Property cannot assume the
obligation. Except as otherwise approved in writing by the Lender in advance,
Lender may declare the entire balance of the Note to be immediately due and
payable upon the creation of, or contract for the creation of, any lien,
encumbrance, or transfer of the Property. However, I may sell or similarly
dispose of any Property that is inventory.

12.         WAIVERS AND CONSENT. To the extent not prohibited by law, I waive
protest, presentment for payment, demand, notice of acceleration, notice of
intent to accelerate and notice of dishonor.

  A.         Additional Waivers By Borrower. In addition, I, and any party to
this Note and Loan, to the extent permitted by law, consent to certain actions
you may take, and generally waive defenses that may be available based on these
actions or based on the status of a party to this Note.

  (1)        You may renew or extend payments on this Note, regardless of the
number of such renewals or extensions.

  (2)        You may release any Borrower, endorser, guarantor, surety,
accommodation maker or any other co-signer.

  (3)        You may release, substitute or impair any Property securing this
Note.

  (4)        You, or any institution participating in this Note, may invoke your
right of set-off.

  (5)        You may enter into any sales, repurchases or participations of this
Note to any person in any amounts and I waive notice of such sales, repurchases
or participations.

  (6)        I agree that any of us signing this Note as a Borrower is
authorized to modify the terms of this Note or any instrument securing,
guarantying or relating to this Note.

  B.         No Waiver By Lender. Your course of dealing, or your forbearance
from, or delay in, the exercise of any of your rights, remedies, privileges or
right to insist upon my strict performance of any provisions contained in this
Note, or other Loan documents, shall not be construed as a waiver by you, unless
any such waiver is in writing and is signed by you.

13.         APPLICABLE LAW. This Note is governed by the laws of Virginia, the
United States of America and to the extent required, by the laws of the
jurisdiction where the Property is located. In the event of a dispute, the
exclusive forum, venue and place of jurisdiction will be in Virginia, unless
otherwise required by law.

14.         JOINT AND INDIVIDUAL LIABILITY AND SUCCESSORS. My obligation to pay
this Loan is independent of the obligation of any other person who has also
agreed to pay it. You may sue me alone, or anyone else who is obligated on this
Loan, or any number of us together, to collect this Loan. Extending this Loan or
new obligations under this Loan, will not affect my duty under this Loan and I
will still be obligated to pay this Loan. The duties and benefits of this Loan
will bind and benefit the successors and assigns of you and me.

15.         AMENDMENT, INTEGRATION AND SEVERABILITY. This Note may not be
amended or modified by oral agreement. No amendment or modification of this Note
is effective unless made in writing and executed by you and me. This Note is the
complete and final expression of the agreement. If any provision of this Note is
unenforceable, then the unenforceable provision will be severed and the
remaining provisions will still be enforceable.

16.         INTERPRETATION. Whenever used, the singular includes the plural and
the plural includes the singular. The section headings are for convenience only
and are not to be used to interpret or define the terms of this Note.

17.         NOTICE, FINANCIAL REPORTS AND ADDITIONAL DOCUMENTS. Unless otherwise
required by law, any notice will be given by delivering it or mailing it by
first class mail to the appropriate party’s address listed in the DATE AND
PARTIES section, or to any other address designated in writing. Notice to one
party will be deemed to be notice to all parties. I will inform you in writing
of any change in my name, address or other application information. I agree to
sign, deliver, and file any additional documents or certifications that you may
consider necessary to perfect, continue, and preserve my obligations under this
Loan and to confirm your lien status on any Property. Time is of the essence.

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

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

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

WidePoint Corporation     Virginia Promissory Note   Initials ______ 
VA/4HancockD00725200004266019080607N -1996 Bankers Systems, Inc., St. Cloud, MN
C Page 3

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

18.         CREDIT INFORMATION. I agree to supply you with whatever information
you reasonably feel you need to decide whether to continue this Loan. You will
make requests for this information without undue frequency, and will give me
reasonable time in which to supply the information.

19.         ERRORS AND OMISSIONS. I agree, if requested by you, to fully
cooperate in the correction, if necessary, in the reasonable discretion of you
of any and all loan closing documents so that all documents accurately describe
the loan between you and me. I agree to assume all costs including by way of
illustration and not limitation, actual expenses, legal fees and marketing
losses for failing to reasonably comply with your requests within thirty (30)
days.

20.         SIGNATURES. By signing under seal, I agree to the terms contained in
this Note. I also acknowledge receipt of a copy of this Note.

  BORROWER:

  WidePoint Corporation  
     By _________________________________ (Seal)        James T. McCubbin, CFO

ACKNOWLEDGMENT

(Business or Entity)

COMMONWEALTH/STATE OF ________________, COUNTY (OR CITY) OF ________________ ss.

This instrument was acknowledged before me this _____________ day of
____________________, _____________ by James T. McCubbin — CFO of WidePoint
Corporation a Delaware corporation, on behalf of the corporation.

Notary Public: _______________________________    My Commission Expires:
____________     Registration # (if required): ________________________

  BORROWER:

  Widepoint IL, Inc.  
     By _________________________________ (Seal)        James T. McCubbin, CFO

ACKNOWLEDGMENT

(Business or Entity)

COMMONWEALTH/STATE OF ________________, COUNTY (OR CITY) OF ________________ ss.

This instrument was acknowledged before me this _____________ day of
____________________, _____________ by James T. McCubbin - CFO of Widepoint IL,
Inc. an Illinois corporation, on behalf of the corporation.

Notary Public: _______________________________    My Commission Expires:
____________     Registration # (if required): ________________________

  BORROWER:

  WP NBIL, Inc.  
     By _________________________________ (Seal)        James T. McCubbin, CFO

ACKNOWLEDGMENT

(Business or Entity)

COMMONWEALTH/STATE OF ________________, COUNTY (OR CITY) OF ________________ ss.

This instrument was acknowledged before me this _____________ day of
____________________, _____________ by James T. McCubbin - CFO of WP NBIL, Inc.
an Illinois corporation, on behalf of the corporation.

Notary Public: _______________________________    My Commission Expires:
____________     Registration # (if required): ________________________

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

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

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

WidePoint Corporation     Virginia Promissory Note   Initials ______ 
VA/4HancockD00725200004266019080607N -1996 Bankers Systems, Inc., St. Cloud, MN
C Page 4

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

  BORROWER:

  Chesapeake Government Technologies, Inc.  
     By _________________________________ (Seal)        James T. McCubbin, CFO

ACKNOWLEDGMENT

(Business or Entity)

COMMONWEALTH/STATE OF ________________, COUNTY (OR CITY) OF ________________ ss.

This instrument was acknowledged before me this _____________ day of
____________________, _____________ by James T. McCubbin — CFO of Chesapeake
Government Technologies, Inc. a Delaware corporation, on behalf of the
corporation.

Notary Public: _______________________________    My Commission Expires:
____________     Registration # (if required): ________________________

  BORROWER:

  Operational Research Consultants, Inc.  
     By _________________________________ (Seal)        James T. McCubbin, CFO

ACKNOWLEDGMENT

(Business or Entity)

COMMONWEALTH/STATE OF ________________, COUNTY (OR CITY) OF ________________ ss.

This instrument was acknowledged before me this _____________ day of
____________________, _____________ by James T. McCubbin — CFO of Operational
Research Consultants, Inc. a Virginia corporation, on behalf of the corporation.

Notary Public: _______________________________    My Commission Expires:
____________     Registration # (if required): ________________________

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

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

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

WidePoint Corporation     Virginia Promissory Note   Initials ______ 
VA/4HancockD00725200004266019080607N -1996 Bankers Systems, Inc., St. Cloud, MN
C Page 5

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

APPENDIX: FEES AND CHARGES

As described in the ADDITIONAL CHARGES section of the attached Note, I agree to
pay, or have paid, these additional fees and charges.

Nonrefundable Fees and Charges. The following fees are earned when collected and
will not be refunded if I prepay this Note before the scheduled maturity date.

  UCC Recordation/Termination. A(n) UCC Recordation/Termination fee of $200.00
payable from separate funds on or before today’s date.

  Lien Search. A(n) Lien Search fee of $499.25 payable from separate funds on or
before today's date.

  Audit. A(n) Audit fee of $1,500.00 payable from separate funds on or before
today’s date.

I understand and agree that some payments to third parties as part of this
transaction may also involve money retained by you or paid back to you as
commissions or other remuneration.

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

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

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

WidePoint Corporation     Virginia Promissory Note   Initials ______ 
VA/4HancockD00725200004266019080607N -1996 Bankers Systems, Inc., St. Cloud, MN
C Page 6