Document:

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                                                                   EXHIBIT 10.29

                                 FORM OF WARRANT
THIS WARRANT AND ANY SECURITIES ACQUIRED UPON EXERCISE OF THIS WARRANT HAVE NOT
BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE "SECURITIES
ACT"), OR THE SECURITIES LAWS OF ANY STATE. NEITHER THIS WARRANT, SUCH
SECURITIES NOR ANY INTEREST THEREIN MAY BE TRANSFERRED EXCEPT PURSUANT TO AN
EFFECTIVE REGISTRATION STATEMENT UNDER THE SECURITIES ACT AND APPLICABLE STATE
SECURITIES LAWS OR PURSUANT TO AN APPLICABLE EXEMPTION FROM THE REGISTRATION
REQUIREMENTS OF THE SECURITIES ACT AND SUCH STATE SECURITIES LAWS.

                               MOTIENT CORPORATION
                   WARRANT TO PURCHASE SHARES OF COMMON STOCK
                  ---------------------------------------------

     This warrant (this "Warrant") certifies that, for good and valuable
consideration, Motient Corporation, a Delaware corporation (the "Company"),
grants to [__________] or its permitted assigns (the "Warrantholder"), the right
to subscribe for and purchase from the Company, at any time during the Exercise
Period (as defined herein), [__________] shares of Common Stock (the "Warrant
Shares"), at the exercise price per share of [__________] (the "Exercise
Price"), all subject to the terms, conditions and adjustments herein set forth.
The number of Warrant Shares is subject to adjustment as provided in Article
III.

I.   DEFINITIONS
     1.1 Definitions. As used herein, unless the context otherwise requires, the
following terms have the following respective meanings:

     "Affiliate" with respect to any Person, shall mean any other Person that
directly or indirectly, controls, is controlled by, or is under common control
with, such Person.

     "Business Day" means any day other than a Saturday, Sunday or a day on
which national banks are authorized by law to close in the State of New York.

     "Closing Price" of a share of Common Stock for any day shall mean the last
reported sales price, regular way, or, in the event that no sale takes place on
such day, the average of the reported closing bid and asked prices, regular way,
in either case as reported on the principal national securities exchange on
which such Common Stock is listed or admitted to trading or, if not listed or
admitted to trading on any national securities exchange, on the Nasdaq National
Market System or the Nasdaq SmallCap Market or, if such security is not quoted
on the Nasdaq National Market System or the Nasdaq SmallCap Market, the average
of the closing bid and asked prices on each such day in the over-the-counter
market as reported by Nasdaq or, if bid and asked prices for such security on
each such day shall not have been reported by Nasdaq, the average of the bid and
asked prices for such day as furnished by any reputable investment banking firm
regularly making a market in such security selected for such purpose by the
Board of Directors of the Company or a committee thereof. If the Closing Price
cannot be calculated on such date on any of the foregoing bases, the Closing
Price of such security on such date shall be the fair market value as reasonably
determined by an Independent Financial Expert selected for such purpose by the
Board of Directors of the Company or a committee thereof.

     "Common Stock" means the common stock, par value $0.01 per share, of the
Company.

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     "Governmental Authority" means any foreign, federal, state, local or other
governmental authority or regulatory body having jurisdiction over the Company,
its Affiliates or the Warrantholder.

     "Independent Financial Expert" means a nationally recognized investment
banking firm that does not (and whose directors, officers, employees and
Affiliates do not) have a direct or indirect financial interest in the Company
or any of its Affiliates, that has not been and at the time it is called upon to
give independent financial advice to the Company is not (and none of whose
directors, officers, employees or Affiliates is) a promoter, director or officer
of the Company or any of its Affiliates, and that does not provide any advice or
opinions to the Company or any of its Affiliates.

     "Person" means any individual, firm, corporation, partnership, limited
liability company, trust, incorporated or unincorporated association, joint
venture, joint stock company, Governmental Authority or other entity of any
kind, and shall include any successor (by merger or otherwise) of such entity.

     "Securities Act" means the Securities Act of 1933, as amended from time to
time.

II.  EXERCISE OF WARRANT
     2.1 Exercise Period. On the terms and subject to the conditions contained
herein, the Warrantholder may exercise this Warrant on any Business Day starting
on [__________] and ending at 5:00 p.m., Eastern Standard Time, on [insert date
that is 5 years after issuance] (the "Exercise Period"), for all or any part of
the Warrant Shares.

     2.2 Exercise Procedure. To exercise this Warrant, the Warrantholder shall
deliver to the Company at its principal executive offices: (a) payment of the
aggregate Exercise Price in the manner provided in Section 2.3 (as computed by
multiplying (A) the Exercise Price by (B) the number of shares of Common Stock
for which the Warrantholder is exercising this Warrant at such time); (b) a
completed and properly executed Notice of Exercise in substantially the form
attached hereto as Annex I; and (c) this Warrant. Upon receipt of the aggregate
Exercise Price and the required deliverables pursuant to the preceding sentence,
the Company shall, within three (3) Business Days thereafter, subject to receipt
of any required regulatory approvals (including expiration of any required
waiting period), deliver to the Warrantholder duly executed certificate(s)
representing the aggregate number of shares of Common Stock issuable upon such
exercise, together with cash in lieu of any fraction of a Warrant Share as
provided in Section 2.6. Such stock certificate(s) shall be in such
denominations and registered in the name(s) as the Warrantholder shall request
in the Notice of Exercise. If this Warrant shall have been exercised in part,
the Company shall deliver to the Warrantholder a new warrant evidencing the
rights of the Warrantholder to purchase the remaining Warrant Shares issuable
(which shall in all other respects be identical to this Warrant). All shares of
Common Stock issuable upon the exercise of this Warrant pursuant to the terms
hereof shall be validly issued, fully paid and nonassessable and without any
preemptive rights.

     2.3 Payment of Exercise Price. The aggregate Exercise Price calculated in
accordance with Section 2.2 may be payable hereunder by the delivery by
certified check or by wire transfer of immediately available funds to the
account of the Company of an amount equal to such aggregate Exercise Price.

     2.4 Restrictions. The Company shall not be required to issue any shares of
Common Stock under this Warrant if the issuance of such shares would constitute
a violation by the Company of any provision of any law, rule or regulation of
(i) any Governmental Authority, including without limitation, compliance with

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the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended (the "HSR
Act"), and compliance with registration or qualification requirements of
applicable federal and state securities laws or (ii) any applicable self
governing organization or stock exchange, including without limitation, the
rules, regulations or listing requirements of any such organization or stock
exchange. If at any time the Company shall determine, based upon the advice of
counsel, that the registration, qualification or listing of any shares subject
to this Warrant under any applicable state or federal law or other applicable
rules or regulations (including those of any applicable stock exchange), or any
filing or expiration of any waiting period under the HSR Act, is necessary as a
condition of, or in connection with, the issuance of shares, the Company shall
not be required to issue any shares of Common Stock under this Warrant unless
and until the Company has received evidence reasonably satisfactory to it that
such laws, rules or regulations have been complied with and/or such filing has
been made and the applicable waiting period has expired under the HSR Act.

     2.5 Payment of Taxes. The Company shall pay all stamp taxes and other
similar charges with respect to the issue or delivery of Common Stock hereunder.
The Company shall not be required to pay any transfer tax or other similar
charge imposed in connection with the issue of any stock certificate in any name
other than that of the Warrantholder, and in such case the Company shall not be
required to issue or deliver any stock certificate until such tax or other
charge has been paid or it has been established to the reasonable satisfaction
of the Company that no such tax or other charge is due.

     2.6 Fractional Shares. The Company shall not be required to issue any
fractional shares of Common Stock upon exercise of this Warrant. In lieu of any
fractional share to which the Warrantholder would otherwise be entitled upon
exercise of this Warrant, the Company shall make a cash payment in an amount
equal to the product of (a) the Closing Price per share of Common Stock on the
date of exercise multiplied by (b) the fraction of a share.

III. ADJUSTMENTS
     3.1 Subdivision or Combination of Common Stock. If the Company at any time
subdivides (by any stock split, stock dividend, recapitalization or otherwise)
its outstanding shares of Common Stock into a greater number of shares, then as
of the record date for effecting such subdivision the number of shares issuable
upon exercise of this Warrant will be proportionately increased and the Exercise
Price in effect immediately prior to such subdivision shall be proportionately
decreased. If the Company at any time combines (by reverse stock split,
recapitalization or otherwise) its outstanding shares of Common Stock into a
smaller number of shares, then as of the record date for effecting such
combination the number of shares issuable upon exercise of this Warrant will be
proportionately decreased and the Exercise Price in effect immediately prior to
such combination shall be proportionately increased.

     3.2 Consolidation, Merger, etc. In case of any consolidation or merger of
the Company with or into any other Person, or (a) any other corporate
reorganization, in which the Company shall not be the continuing or surviving
entity of such consolidation, merger or reorganization or in connection with
which the Common Stock (or other securities issuable upon exercise of this
Warrant) shall be changed into or exchanged for stock of any other entity or
cash or other property, (b) any transaction in which in excess of 50% of the
Company's voting power is transferred to a Person not a stockholder immediately
prior to the consummation of such transaction, (c) any sale of all or
substantially all of the assets of the Company or (d) a capital reorganization
or reclassification of the Common Stock (or other securities issuable upon
exercise of this Warrant) that does not result in an adjustment pursuant to
Section 3.1 (any such transaction being hereinafter referred to as a

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"Reorganization"), then, in each case, the Warrantholder, on exercise hereof at
any time after the consummation or effective date of such Reorganization, shall
receive, in lieu of the Warrant Shares issuable on such exercise prior to the
date of such Reorganization, the stock, other securities, cash or other property
to which such holder would have been entitled upon the date of such
Reorganization if such holder had exercised this Warrant immediately prior
thereto.

     3.3 Notice of Adjustment. Whenever an event necessitating an adjustment to
this Warrant pursuant to this Article III occurs, the Company shall promptly
deliver written notice thereof, by first class mail, postage prepaid, addressed
to the Warrantholder in accordance with Section 7.5, which notice shall state
the increase or decrease in the number or other denominations of securities
purchasable and exercise price payable upon the exercise of this Warrant setting
forth in reasonable detail the method of calculation and the facts upon which
such calculation is based.

IV.  RESTRICTIONS ON TRANSFER
     4.1 Restrictions on Transfer. The Warrantholder, by its acceptance of this
Warrant, agrees to be bound by the provisions of this Article IV and
acknowledges and confirms that this Warrant and any Warrant Shares issued upon
exercise of this Warrant have not been registered under the Securities Act or
any applicable state securities laws, and may not be sold or transferred except
in compliance with and subject to the Securities Act and such state securities
laws. Unless and until this Warrant and such Warrant Shares have been registered
under the Securities Act and such state securities laws, the Company may
require, as a condition to effecting any sale or transfer of this Warrant or
such Warrant Shares on the books of the Company, an opinion of counsel
reasonably satisfactory to the Company to the effect that an exemption from
registration under the Securities Act and such state securities laws is
available for the proposed transfer or assignment or a certification reasonably
satisfactory to the counsel of the Company in its professional determination
from the transferee that it is an "accredited investor" as defined under the
Securities Act and regulations promulgated thereunder. Any purported sale or
transfer of this Warrant and/or such Warrant Shares shall be null and void
unless made in compliance with the conditions set forth in this Article IV.
Except as provided in Section 4.2, (a) this Warrant and any warrant of the
Company issued in exchange or replacement for this Warrant shall be stamped or
otherwise imprinted with a legend in substantially the form set forth on the
cover of this Warrant, (b) each stock certificate for Warrant Shares issued upon
the exercise of this Warrant and each stock certificate issued upon the transfer
of any such Warrant Shares shall be stamped or otherwise imprinted with a legend
substantially to the same effect.

     4.2 Termination of Restrictions. The restrictions imposed by Section 4.1
upon the transferability of this Warrant and the Warrant Shares shall terminate:
(a) when and so long as this Warrant or any such Warrant Shares shall have been
effectively registered under the Securities Act and transferred in compliance
therewith; or (b) when the Company shall have received an opinion of counsel
reasonably satisfactory to it that this Warrant or such Warrant Shares may be
transferred without registration thereof under the Securities Act; provided,
however, that if the Warrant or the Warrant Shares have been held (both legally
and beneficially) by the Warrantholder for at least one (1) year and is proposed
to be sold in compliance with Rule 144 under the Securities Act, no such opinion
of counsel shall be required. Whenever the legend requirements imposed by
Section 4.1 shall terminate as to this Warrant or the Warrant Shares, the holder
of this Warrant or any Warrant Shares shall be entitled to receive from the
Company, at the Company's expense, a new warrant or a new stock certificate
representing the Warrant Shares, as the case may be, not bearing the restrictive
legend described in Section 4.1.

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     4.3 Compliance with Securities Laws. The Warrantholder, by acceptance
hereof, represents to the Company that this Warrant and any Warrant Shares
purchased upon exercise of this Warrant are being acquired solely for the
Warrantholder's own account and not as a nominee for any other party, and for
investment, and that the Warrantholder will not offer, sell or otherwise dispose
of this Warrant or any such Warrant Shares except under circumstances that will
not result in a violation of the Securities Act or any applicable state
securities laws.

     4.4 Transfer Procedure. Subject to compliance with the other provisions of
this Article IV, transfer of this Warrant, in whole or in part, shall occur upon
surrender of this Warrant at the principal executive offices of the Company,
together with a duly executed written assignment of this Warrant in
substantially the form attached hereto as Annex II and funds sufficient to pay
any transfer taxes payable upon the making of such transfer and, if required, an
opinion of counsel reasonably acceptable to counsel of the Company in its
professional determination concerning the compliance of such transfer with the
Securities Act and applicable state securities laws. Upon receipt of such items,
the Company shall execute and deliver a new warrant or warrants in the name of
the assignee or assignees and in the denomination(s) specified in such
instrument of assignment, and shall issue to the assignor a new warrant
evidencing the portion of this Warrant not so assigned, and this Warrant shall
promptly be cancelled.

     4.5 Maintenance of Transfer Books. The Company agrees to maintain, at the
principal executive office of the Company, books or records for the registration
and the registration of transfer of this Warrant or any warrant of the Company
issued in exchange for this Warrant.

V.   NECESSARY ACTIONS
     The Company will: (a) use its commercially reasonable efforts to obtain all
such authorizations, approvals, exemptions or consents from any Governmental
Authority having jurisdiction thereof as may be necessary to enable the Company
to perform its obligations under this Warrant (including, without limitation,
making all necessary filings with such Governmental Authorities); (b) take all
necessary steps (including, without limitation, making appropriate amendments to
its certificate of incorporation) to ensure that the Company has authorized a
sufficient number of authorized but unissued shares of its Common Stock to
provide for the issuance of the Warrant Shares; (c) reserve from such authorized
but unissued shares of Common Stock a sufficient number of shares to provide for
the issuance of the Warrant Shares upon the exercise of this Warrant; and (d)
take all actions as may be necessary or appropriate to ensure that the Company
may validly and legally issue fully paid and non-assessable shares of Common
Stock upon the exercise of this Warrant that are not subject to any preemptive
rights and are free from all taxes, liens, security interests, charges, and
other encumbrances with respect to the issuance thereof, other than taxes in
respect of any transfer occurring contemporaneously with such issuance.

     VI. LOSS OR MUTILATION On receipt of evidence reasonably satisfactory to
the Company of the loss, theft, destruction or mutilation of this Warrant and
(a) in the case of loss, theft or destruction, on delivery of an indemnity
agreement reasonably satisfactory in form and substance to the Company; or (b)
in the case of mutilation, on surrender and cancellation of this Warrant, the
Company shall execute and deliver, in lieu of this Warrant, a new warrant of
like tenor and amount.

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VII. MISCELLANEOUS

     7.1 Entire Agreement. This Warrant constitutes the entire agreement between
the Company and the Warrantholder with respect to the Warrant.

     7.2 Nonwaiver. No course of dealing or any delay or failure to exercise any
right hereunder on the part of the Warrantholder shall operate as a waiver of
such right or otherwise prejudice the Warrantholder's rights, powers or
remedies.

     7.3 Binding Effect; No Third-Party Beneficiaries. This Warrant shall inure
to the benefit of and shall be binding upon the Company and the Warrantholder
and their respective successors and permitted assigns. Nothing in this Warrant,
expressed or implied, is intended to or shall confer on any Person other than
the Company and the Warrantholder, or their respective successors or permitted
assigns, any rights, remedies, obligations or liabilities under or by reason of
this Warrant.

     7.4 Section and Other Headings. The section and other headings contained in
this Warrant are for reference purposes only and shall not be deemed to be a
part of this Warrant or to affect the meaning or interpretation of this Warrant.

     7.5 Notices. Except as otherwise expressly provided herein, all notices and
deliveries referred to in this Warrant shall be in writing (including facsimile
transmission or similar writing) and shall be given to such party at its address
or facsimile number set forth on the signature pages hereof. Each such notice,
request or other communication shall be deemed received by the other party (i)
if given by facsimile transmission, when transmitted to the facsimile number
specified in this Section and confirmation of receipt is received, (ii) if given
by mail, 72 hours after such communication is deposited in the mails with first
class postage prepaid, addressed as aforesaid or (iii) if given by any other
means, when delivered at the address specified in this Section.

     7.6 Severability. Whenever possible, each provision of this Warrant will be
interpreted in such manner as to be effective and valid under applicable law,
but if any provision of this Warrant is held by a court of competent
jurisdiction to be invalid, illegal or unenforceable in any respect under any
applicable law or rule in any jurisdiction, such invalidity, illegality or
unenforceability will not affect any other provision of this Warrant or the
validity, legality or enforceability of this Warrant in any other jurisdiction.
In such event, this Warrant will be reformed, construed and enforced in such
jurisdiction as if such invalid, illegal or unenforceable provision had never
been contained herein.

     7.7 Governing Law. ALL QUESTIONS CONCERNING THE CONSTRUCTION, VALIDITY AND
INTERPRETATION OF THIS WARRANT AND THE ISSUANCE OF SECURITIES HEREUNDER WILL BE
GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE INTERNAL LAWS OF THE STATE OF
DELAWARE, WITHOUT GIVING EFFECT TO ANY CHOICE OF LAW OR CONFLICT OF LAW
PROVISION OR RULE (WHETHER OF THE STATE OF DELAWARE OR ANY OTHER JURISDICTION)
THAT WOULD CAUSE THE APPLICATION OF THE LAWS OF ANY JURISDICTION OTHER THAN THE
STATE OF DELAWARE.

     7.8 Rights or Liabilities as Stockholder. The Warrantholder shall be deemed
to have become a holder of record of the shares of Common Stock issuable under
Section 2.2 as of the date on which all required deliverables pursuant to

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Section 2.2 have been received by the Company. Until such time the Warrantholder
shall not have any voting rights or other rights or liabilities of a stockholder
of the Company with respect to the Common Stock issuable hereunder.

     7.9 Amendment. No amendment or waiver of any provision of this Warrant
shall be effective without the prior written consent of the Company and the
Warrantholder.

                            [SIGNATURE PAGE FOLLOWS]

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     IN WITNESS WHEREOF, the Company has caused this Warrant to be signed by its
duly authorized officer.

                                      MOTIENT CORPORATION

                                      By:      _________________________
                                      Name:    _________________________
                                      Title:   _________________________

                                      Warrantholder Information:

                                      __________________________________
                                      __________________________________
                                      __________________________________

Dated: January 27, 2003

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                                     Annex I
                               NOTICE OF EXERCISE
                 (To be executed upon exercise of this Warrant)

                  The undersigned hereby irrevocably elects to exercise the
right represented by this Warrant to purchase ___________shares of Common Stock,
and herewith tenders to the Company as payment for such shares the amount of
$____________ in accordance with the terms of this Warrant. The undersigned
requests that a certificate for such shares be registered in the name of each of
the following:
                            Name:
                                   ------------------
                           Address:
                                   ------------------
                                   ------------------
                                   ------------------

and that each certificate be delivered to the above at the address indicated.

                  The undersigned represents that it is an accredited investor
(as defined in applicable rules and regulations under the Securities Act of
1933, as amended), and that it is acquiring such shares of Common Stock for its
own account for investment and not with a view to or for sale in connection with
any distribution thereof. Dated:
                                 --------------------------

                            Signature
                                     -----------------------------

                                     -----------------------------
                                       (Print Name)

                                     -----------------------------
                                       (Street Address)

                                      -----------------------------
                                       (City) (State) (Zip Code)

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                                    Annex II
                               WRITTEN ASSIGNMENT

                  FOR VALUE RECEIVED, __________________ hereby sells, assigns,
and transfers unto__________________________________________ (please print name
and address) this Warrant, together with all right, title and interest therein,
and does hereby irrevocably constitute and appoint _____________________
Attorney, to transfer the Warrant on the books of Motient Corporation with full
power of substitution.

Dated:
      -----------------             -------------------------------------------
                                    Signature
Signature Guaranteed:

-----------------------------------
The signature to the assignment must correspond to the name of the registered
holder of this Warrant on the books and records of the Company in every
particular, without alteration or any change whatsoever, and must be guaranteed
by a participant in the Security Transfer Agents Medallion Program or an
institution receiving prior approval of the Company. If the assignment is signed
pursuant to a power of attorney, such power of attorney must be attached hereto.

                                       10<PAGE>

                                                                   EXHIBIT 10.30

[GRAPHIC OMITTED]
[Motient Logo]

                                  CONFIDENTIAL

February 10, 2004

Walter V. Purnell, Jr.
[OMITTED]

Dear Walt:

                  The purpose of this letter is to define the terms of your
separation from employment with Motient Corporation, to settle any claims under
that certain Executive Retention Agreement, dated as of July 16, 2002, by and
between Motient Corporation and you ("Retention Agreement"), and to set out
certain arrangements with respect to your separation. In consideration of the
mutual covenants herein contained, and other good and valuable consideration,
the receipt and sufficiency of which are hereby acknowledged, the parties agree
as follows:

1.                  Termination of Employment:

                    a.   You are hereby relieved of all your duties effective
                         immediately, but your termination date shall be March
                         11, 2004.

                    b.   Effective immediately, you agree to, and hereby do,
                         resign from the boards of directors of Motient
                         Corporation, and all its subsidiaries and affiliates.

                    c.   You also hereby agree to resign from Mobile Satellite
                         Ventures GP Inc. and all its subsidiaries and
                         affiliates, provided, however, that such resignation
                         shall not be delivered until the earlier of (x) the
                         appointment by Motient of a successor director, or (y)
                         such earlier date upon which Motient determines to
                         render such resignation effective.

2.                  Settlement of Executive Retention Agreement:

                    a.   You will receive a continuing severance payment of an
                         amount equal to one-half of your current base salary
                         for the next eighteen months. This severance payment
                         amount shall be paid in bi-weekly installments in
                         accordance with the Company's normal payroll schedule
                         for active employees.

                    b.   On September 11, 2005, you will also receive an
                         additional lump sum severance payment of an amount
                         equal to the sum total of all amounts required to be
                         paid out pursuant to paragraph 2(a) above. .

                    c.   You will continue to be eligible for the standard
                         health benefits package made available to all employees
                         over the next eighteen months.

<PAGE>

                    d.   If you participate in a health care flexible spending
                         account, you may continue to submit claims for
                         reimbursement for expenses incurred through your last
                         day of employment up to three months following the end
                         of the current plan year. If you have not incurred
                         expenses prior to your last day of employment, you may
                         continue monthly after-tax contributions up to the end
                         of the current plan year. This will keep your account
                         open for reimbursement of health care expenses incurred
                         after your separation date. If we do not receive
                         continued after-tax contributions within 60 days of
                         your last day of employment, your plan year will end on
                         such date.

                    e.   If you participate in a dependent care flexible
                         spending account, you can submit request for
                         reimbursement up to 3 months following the end of your
                         current plan year. Expenses are eligible only if you
                         (and your spouse if your are married) are working or
                         seeking employment. No additional after-tax
                         contributions to your account will be allowed.

                    f.   If you have a 401(k) account and your vested balance is
                         greater than $3,500, you may keep your account with
                         CIGNA. If your vested account balance is less than
                         $3,500, you must withdraw or rollover your 401(k)
                         balance within a specified time frame. Withdrawals are
                         subject to relevant I.R.S. limitations and penalties.
                         Any outstanding loans must be paid back directly to
                         CIGNA, or they are otherwise considered cash
                         distributions subject to applicable taxes and
                         penalties. Please contact CIGNA at 1-800-253-2287 for
                         information on future account transactions.

                    g.   Your accrued PTO will be paid out in a lump sum on the
                         next practicable pay date following your last day with
                         Motient.

                    h.   Your reimbursable expenses will be paid out in a lump
                         sum on the next practicable pay date following your
                         last day with Motient.

                    i.   Any stock options issued pursuant to Motient's 2002
                         Stock Potion plan will be subject to the terms of such
                         plan, and to the award grant under which they were
                         issued.

3.                  In consideration of the above, you agree to the following:

                    a.   You will support Motient publicly and not take any
                         action or make any statement that would detract from
                         Motient's image or ability to carry on its business.
                         Motient agrees not to disparage you.

                    b.   You agree to sign the attached Exhibit A, Waiver and
                         Release Agreement, which form was substantially agreed
                         to as part of the Retention Agreement, and the terms
                         and conditions of which are specifically incorporated
                         herein by reference.

                    c.   You agree to sign the attached Exhibit B, Non-Compete
                         and Non-Solicit Agreement, which form was substantially
                         agreed to as part of the Retention Agreement, and the
                         terms and conditions of which are specifically
                         incorporated herein by reference.

                    d.   You agree to sign and immediately deliver the attached
                         Exhibit C, a Resignation from the board of directors of
                         Motient Corporation and all its subsidiaries and
                         affiliates. Note that the non-execution or non-delivery
                         of this resignation will not nullify your immediate
                         resignation from Motient Corporation and all its
                         subsidiaries pursuant to paragraph 1(b) above.
<PAGE>

                    e.   You agree to sign and deliver, upon Motient's request,
                         the attached Exhibit D, a Resignation from the board of
                         directors of Mobile Satellite Ventures GP Inc., and all
                         its subsidiaries and affiliates.

                    f.

                    (i)  For a period of three (3) years thereafter, and in
                         keeping with Motient policy, you agree not to use,
                         disclose, or copy Confidential Information, as defined
                         in item (ii) of this paragraph 2(b), or in any other
                         way publicly or privately disseminate Confidential
                         Information, or help anyone else to do any of these
                         things, except as otherwise required by law.

                    (ii) For purposes of this letter, "Confidential Information"
                         means all information or data, of any nature and in any
                         form, whether written, oral, or in any other form, or
                         recorded or transmitted electronically or by tape or
                         any other manner or medium, regarding or relating to
                         the business, operations, prospects, plans, or affairs
                         of Motient which is not generally known to the public.

                    g.   As soon as is reasonably practicable, you agree to
                         return all Motient property in your possession,
                         including but not limited to documents, data and
                         information concerning Motient.

                    h.   In the event of any question or disagreement between
                         you and Motient as to the nature and extent of this
                         Agreement, you agree to meet upon request at a
                         reasonable time and place with Motient management to
                         discuss and attempt in good faith to resolve such
                         question or disagreement.

This letter constitutes the entire agreement between you and Motient with
respect to your separation, and it supersedes any other discussion,
negotiations, commitments or understandings, whether written or oral. It may not
be altered, modified, or amended except in writing and signed by you and
Motient's President, General Counsel or me.

You should feel free to discuss the terms of this letter with an attorney of
your choice before executing it. After you have had an opportunity to carefully
consider it, please sign this letter and return it to me. Please also retain a
copy for your files.

Sincerely,

----------------------
Steven Singer
Chairman of the Board
Motient Corporation

AGREED AND ACCEPTED

------------------------
Walter V. Purnell, Jr.

<PAGE>

                                    EXHIBIT A
                          WAIVER AND RELEASE AGREEMENT

         This Waiver and Release Agreement is in consideration of the severance
pay and benefits provided to me by Motient Corporation (the "Company"), in
accordance with that certain Agreement, dated as of July 16, 2002, by and
between me and the Company and providing for a severance payment, as such
agreement is modified and amended by that certain letter agreement, dated as of
February 10, 2004, by and between me and the Company.

         The payments and benefits described above are referred to herein
collectively as the "Severance Payment." I acknowledge and agree that I would
not be entitled to the Severance Payment without entering into this Waiver and
Release Agreement, and I voluntarily enter into this Waiver and Release
Agreement.

         I, on my own behalf and on behalf of my heirs, executors,
administrators, attorneys and assigns, hereby unconditionally and irrevocably
release, waive and forever discharge the Company and each of its affiliates,
parents, successors, predecessors, and the subsidiaries, directors, owners,
members, shareholders, officers, agents, and employees of the Company and its
affiliates, parents, successors, predecessors, and subsidiaries (collectively
all of the forgoing are referred to as the "Employer"), from any and all causes
of action, claims and damages, including attorneys' fees, whether known or
unknown, foreseen or unforeseen, presently asserted or otherwise arising through
the date of my signing of the Waiver and Release Agreement, concerning my
employment or separation from employment. This release includes, but is not
limited to, any claim or entitlement to salary, bonuses, any other payments,
benefits or damages arising under any federal law (including but not limited to,
Title VII of the Civil Rights Act of 1964, the Age Discrimination in Employment
Act, the Employee Retirement Income Security Act of 1974 (namely, "ERISA"), the
Americans with Disabilities Act, and the Family and Medical Leave Act, each as
amended); any claim arising under any state or local ordinances or regulations;
and any claim arising under any common law principle or public policy, including
but not limited to all suits in tort or contract, such as, wrongful termination,
defamation, emotional distress, invasion of privacy or loss of consortium.
Notwithstanding the preceding, this Waiver and Release agreement shall not apply
with respect to a claim under ERISA for benefits accrued but not paid under an
ERISA Plan.

         I understand that by signing this Waiver and Release Agreement I am not
waiving any claims or administrative charges which cannot be waived by law. I am
waiving, however, any right to monetary recovery or individual relief should any
federal, state or local agency (including the Equal Employment Opportunity
Commission (the "EEOC")) pursue any claim on my behalf arising out of or related
to my employment with and/or separation from employment with the Employer.

         I further agree, without any reservation whatsoever, never to sue the
Employer or become a party to a lawsuit on the basis of any and all claims of
any type lawfully and validly released in this Waiver and Release Agreement. If
I sue in violation of the preceding sentence of this Waiver and Release
Agreement, I will (1) pay all costs and expenses incurred by the Employer in
defending against a suit or enforcing this Waiver and Release Agreement,
including litigation and court costs, expenses and reasonable attorneys' fees,
and (2) I will repay the Severance Payment I received in consideration for this
Waiver and Release Agreement.

         I am signing this Waiver and Release Agreement knowingly and
voluntarily. I acknowledge that:

         (1)      I am hereby advised in writing to consult an attorney before
                  signing this Waiver and Release Agreement;

<PAGE>

         (2)      I have relied solely on my own judgment and/or that of my
                  attorney regarding the consideration for and the terms of this
                  Waiver and Release Agreement and am signing this Waiver and
                  Release Agreement knowingly and voluntarily of my own free
                  will;

         (3)      I am not entitled to the Severance Payment amount unless I
                  agree to and honor the terms of this Waiver and Release
                  Agreement.

         (4)      I have been given at least twenty-one (21) days to consider
                  this Waiver and Release Agreement;

         (5)      I may revoke this Waiver and Release Agreement within seven
                  (7) days after signing it by submitting a written notice of
                  revocation to the Company's Human Resources Director, Elyse
                  Ward. I further understand that this Waiver and Release
                  Agreement is not effective or enforceable until after the
                  seven (7) day period of revocation has expired without
                  revocation, and that if I revoke this Waiver and Release
                  Agreement, I will not receive any Severance Payment;

         (6)      I have read and understand the Waiver and Release Agreement
                  and further understand that it includes a general release of
                  any and all known and unknown, foreseen or unforeseen, claims
                  presently asserted or otherwise arising through the date of my
                  signing of this Waiver and Release Agreement that I may have
                  against the Employer; and

         (7)      No statements or conduct by the Employer have in any way
                  coerced or unduly influenced me to execute this Waiver and
                  Release Agreement.

         I further acknowledge that there are no other agreements of any nature
between the Employer and me with respect to the matters discussed in this Waiver
and Release Agreement, except as expressly stated herein, and that in signing
this Waiver and Release Agreement, I am not relying on any agreements or
representation, except those expressly contained in this Waiver and Release
Agreement and the Retention Agreement.

         I further acknowledge and agree that if any provision of this Waiver
and Release Agreement is found, held or deemed by a court of competent
jurisdiction to be void, unlawful or unenforceable under any applicable statute
or controlling law, the remainder of this Waiver and Release Agreement shall
continue in full force and effect.

         This Waiver and Release Agreement is deemed made and entered into in
         the State of Illinois, and in all respects shall be interpreted,
         enforced and governed under applicable federal law, and in the event
         that any reference shall be made to state law, the internal laws of the
         State of Illinois shall apply. Any disputes under this Waiver and
         Release Agreement shall be adjudicated by a court of competent
         jurisdiction in the State of Illinois.

                  I understand that, to receive the Severance Payment amount, I
must sign and return this Waiver and Release Agreement no sooner than my
employment termination date and no later than twenty-one (21) days from the date
my employment was terminated.

-----------------------------                  ------------------------
Date                                           Signature

<PAGE>

                                    EXHIBIT B
                      NON-COMPETE AND NON-SOLICIT AGREEMENT

         THIS NON-COMPETE AND NON-SOLICIT AGREEMENT ("Agreement") is entered
into between Motient Corporation (the "Company") and myself, the undersigned
employee of the Company effective as of the execution date set forth below. In
consideration of the severance payments to be provided to me under that certain
Agreement, dated as of July 16, 2002, by and between the Company and me, as such
agreement is modified and amended by that certain letter agreement, dated as of
February 10, 2004, by and between me and the Company, the sufficiency of which I
expressly acknowledge, the Company and I hereby agree, intending to be legally
bound, as follows:

1.       Employee Obligations

         1.1. No Solicitation of Employees. For twelve (12) months after my
employment with the Company is terminated, whether voluntarily or involuntarily,
I agree not to solicit, directly or indirectly, any of the Company's key
employees for employment with a person or entity involved in marketing or
developing products or services competitive with the Company's products or
services. Key employees include supervisory personnel, executives, personnel in
charge of any department, section or subdivision within the Company and project,
contract managers (or directors) and senior personnel on any individual project
or projects.

         1.2. No Unfair Competition. During my employment with the Company and
for a period of 18 months after the termination of my employment with the
Company, whether voluntarily or involuntarily, I agree that I shall not,
directly or indirectly, engage in or become interested in any Competing
Business, in connection with research, development, consulting, manufacturing,
purchasing, accounting, engineering, marketing, merchandising or selling of any
product or service which resembles or competes with a product or service of the
Company (hereafter, such engagement referred to as "Improper Engagement"). I
understand that I will have engaged in or become interested in a Competing
Business if, whether or not I am compensated, I become an employee, consultant,
advisor or agent of a Competing Business. I also understand that I will have
entered into an Improper Engagement if I become a stockholder owning
beneficially or of record more than five percent (5%) of the outstanding shares
of any class of stock of a Competing Business or a director, partner, joint
venturer or proprietor of a Competing Business. For purposes of this Agreement,
a "Competing Business" is an enterprise engaged in or about to become engaged
in, research on or development, production, marketing or selling of any product
or service which resembles or competes with a product or service of the Company.

         1.3 Fiduciary Duty not to Disclose Proprietary or Confidential
Information. During and after my employment with the Company, I agree to observe
the terms of the Intellectual Property and Confidential Information Agreement,
which I entered into with the Company upon accepting employment with the
Company. I understand and agree that, during and after my employment with the
Company, I shall hold in a fiduciary capacity for the benefit of the Company all
secret or confidential information, knowledge or data relating to the Company or
its affiliated companies and their respective businesses that I have obtained
during the course of my employment by the Company or any of its affiliate
companies that is not public knowledge.

2.       Nature of Relationship

         Nothing herein shall be construed as constituting an agreement,
understanding or commitment of any kind that the Company shall continue to
employ me, nor shall this Agreement limit in any way the Company's right to
terminate my employment at any time for any reason whatsoever, subject to
applicable laws and contracts.

<PAGE>

3.       Enforcement

         I acknowledge that in the event of my breach of any of the obligations
in this Agreement, the Company's business interests will be irreparably injured,
the full extent of the Company's damages will be impossible to ascertain,
monetary damages will not be an adequate remedy for the Company, and the Company
will be entitled to enforce this Agreement by an injunction or other equitable
relief, without the necessity of posting bond or security, which I expressly
waive. I understand that the Company may waive some of the requirements
expressed in this Agreement, but that such a waiver to be effective must be made
in writing by the Company senior management and should not in any way be deemed
a waiver of the Company's right to enforce any other requirements or provisions
of this Agreement. I agree that each of my obligations specified in this
Agreement is a separate and independent covenant that shall survive any
termination of this Agreement and that the unenforceability of any of them shall
not preclude the enforcement of any other covenants in this Agreement.

4.       General Terms

         This is my entire agreement with the Company with respect to its
subject matter and its date, superseding any prior oral or written, express or
implied negotiations and agreements, and its terms will be governed by the laws
of the Commonwealth of Virginia without regard to conflict of laws provisions.
The agreement may not be changed in any respect except by a written agreement
signed by both myself and an officer of the Company. If any provision of the
agreement is held to be invalid, illegal or unenforceable for any reason, the
validity, legality and enforceability of the remaining provisions will not in
any way be affected or impaired thereby.

         By my signature below, I acknowledge that I have reviewed this
Non-Compete and Non-Solicit Agreement carefully and understand that the
covenants and obligations it contains are binding on me.

                              Print Name:
                                         ---------------------------------
                              Date Signed:
                                          --------------------------------
                              Address:
                                      ------------------------------------
                              Social Sec. No:
                                             -----------------------------

Motient Corporation

By:
   -----------------------------------------
Name:
     ---------------------------------------
Title:
      --------------------------------------

<PAGE>

                                    Exhibit C

                                   RESIGNATION

TO:               Steven G. Singer
                  Chairman
                  Motient Corporation
                  Motient Holdings Inc.
                  Motient Communications Inc.
                  Motient Services Inc.
                  MVH Holdings Inc.
                  Motient Ventures Holdings Inc.

     I, Walter V. Purnell, Jr., hereby resign effective as of February 10th,
2004, as a Director of the following entities:

                  Motient Corporation
                  Motient Holdings Inc.
                  Motient Communications Inc.
                  Motient Services Inc.
                  MVH Holdings Inc.
                  Motient Ventures Holdings Inc.

     I do hereby further relinquish all power and authority conferred upon me by
     the By-laws of any of the above entities in my former position as a
     director.

                                            Sincerely,

                                            Walter V. Purnell, Jr.

DATED:  February 10, 2004

<PAGE>

                                    Exhibit D

                                   RESIGNATION

TO:               Dr. Carson E. Agnew,
                  President and COO
                  Mobile Satellite Ventures GP Inc.
                  10802 Parkridge Blvd.
                  Reston VA, 20191

AND TO:  Mobile Satellite Ventures LP

AND TO:  The following subsidiaries of MSV LP:
         Mobile Satellite Ventures Subsidiary LLC
         Mobile Satellite Ventures Corp.
         TerreStar Networks Inc.

AND TO:  The General and Limited Partners, Unit Holders, Stock Holders and
         Shareholders of MSV and its Subsidiaries

         I, Walter V. Purnell, Jr., hereby resign effective as of February 10th,
2004, as a Director of the following Mobile Satellite Ventures entities:

         Mobile Satellite Ventures GP Inc.;
         Mobile Satellite Ventures Corp.;
         Mobile Satellite Ventures Subsidiary LLC; and
         TerrreStar Networks Inc.

I do hereby further relinquish all power and authority conferred upon me by the
By-laws of any of the Mobile Satellite Ventures entities in my former position
as a director.

                                            Sincerely,

                                            Walter V. Purnell, Jr.

DATED:  February 10, 2004

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