Document:

Exhibit 10.2
                               MOTIENT CORPORATION
                          REGISTRATION RIGHTS AGREEMENT

     This REGISTRATION RIGHTS AGREEMENT (this "Agreement") is made as of April
15, 2005 by and among MOTIENT CORPORATION, a Delaware corporation, (the
"Company"), and each investor listed on Schedule 1 hereto (each such investor,
individually, an "Investor" and, collectively, the "Investors").

     WHEREAS, the Company has agreed to issue and sell to the Investors, and the
Investors have agreed to purchase from the Company, an aggregate of 408,500
shares (the "Shares") of the Company's Series A Preferred Stock, $0.01 par value
per share (the "Series A Preferred Stock");

     WHEREAS, the Shares are being issued to the Investors at a per share price
and upon the terms and conditions set forth in the Securities Purchase
Agreement, dated as of the date hereof, between the Company and the Investors
(the "Securities Purchase Agreement"); and

     WHEREAS, the terms of the Securities Purchase Agreement provide that it
shall be a condition precedent to the closing of the transactions thereunder,
for the Company and the Investors to execute and deliver this Agreement.

     NOW, THEREFORE, in consideration of the premises and mutual covenants
contained herein, the parties hereto hereby agree as follows:

     1. DEFINITIONS. The following terms shall have the meanings provided
therefor below or elsewhere in this Agreement as described below:

     "Affiliates" means any Person that, directly or indirectly, through one or
more intermediaries, controls, is controlled by, or is under common control
with, a Person, as such terms are used and construed under Rule 144, and in all
cases including, without limitation, any Person that serves as a general partner
and/or investment adviser or in a similar capacity of such a Person.

     "Board" means the Board of Directors of the Company.

     "Business Day" means any day except Saturday, Sunday and any day which
shall be a federal legal holiday or a day on which banking institutions in the
State of New York are authorized or required by law or other governmental action
to close.

     "Certificate of Designations" means the Certificate of Designations of
Series A Preferred Stock filed by the Company on or before the Closing Date with
the Secretary of State of the State of Delaware.

     "Closing Date" has the meaning set forth in the Securities Purchase
Agreement.

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     "Common Stock" means the Company's common stock, par value $0.01 per share
(including any securities into which or for which such shares may be exchanged
for, or converted into, pursuant to any stock dividend, stock split, stock
combination, recapitalization, reclassification, reorganization or other similar
event).

     "Conversion Shares" means the shares of Common Stock issuable upon
conversion of the Series A Preferred Stock as set forth in the Certificate of
Designations.

     "Dividend Shares" means 2,000,000 shares of Common Stock issuable as a
dividend on the Shares.

     "Exchange Act" means the Securities Exchange Act of 1934, as amended, and
all of the rules and regulations promulgated thereunder.

     "Person" (whether or not capitalized) means an individual, partnership,
limited liability company, corporation, association, trust, joint venture,
unincorporated organization, and any government, governmental department or
agency or political subdivision thereof.

     "Prospectus" means the prospectus included in any Registration Statement
(including, without limitation, a prospectus that includes any information
previously omitted from a prospectus filed as part of an effective Registration
Statement in reliance upon Rule 430A promulgated under the Securities Act), as
amended or supplemented by any prospectus supplement, with respect to the terms
of the offering of any portion of the Registrable Shares covered by such
Registration Statement, and all other amendments and supplements to the
Prospectus, including post-effective amendments, and all material incorporated
by reference in such Prospectus.

     "Registrable Shares" means, at the relevant time of reference thereto, the
Conversion Shares, the Warrant Shares, the Dividend Shares (including any shares
of capital stock that may be issued in respect thereof pursuant to a stock
split, stock dividend, recombination, reclassification or the like) and any
shares of Common Stock issued as a dividend on the Shares in excess of the
Dividend Shares, provided, however, that the term "Registrable Shares" shall not
include any of the Conversion Shares, Dividend Shares or Warrant Shares that are
actually sold pursuant to a registration statement that has been declared
effective under the Securities Act by the SEC.

     "Registration Statement" means the Mandatory S-1 Registration Statement,
any Demand Registration on Form S-3, and any additional registration statements
contemplated by this Agreement, including (in each case) the Prospectus,
amendments and supplements to such registration statement or Prospectus,
including pre- and post-effective amendments, all exhibits thereto, and all
material incorporated by reference in such registration statement or Prospectus.

     "Rule 144" means Rule 144 promulgated under the Securities Act and any
successor or substitute rule, law or provision.

     "SEC" means the Securities and Exchange Commission.

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     "Securities Act" means the Securities Act of 1933, as amended, and all of
the rules and regulations promulgated thereunder.

     "Warrants" means the warrants to purchase Common Stock, dated as of the
date hereof, issued by the Company to the Investors pursuant to the Securities
Purchase Agreement.

     "Warrant Shares" means the shares of Common Stock issued or issuable upon
the exercise of the Warrants.

     2.  MANDATORY FORM S-1 REGISTRATION.

         (a) As promptly as possible after the date hereof, and in any event
prior to the date that is seventy (70) days following the Closing Date (the
"Mandatory Filing Date"), the Company shall prepare and file with the SEC a
Registration Statement on Form S-1 for the purpose of registering under the
Securities Act all of the Registrable Shares for resale by, and for the account
of, each Investor as an initial selling stockholder thereunder (the "Mandatory
S-1 Registration Statement"). The Mandatory S-1 Registration Statement shall
permit the Investors to offer and sell, on a delayed or continuous basis
pursuant to Rule 415 under the Securities Act, any or all of the Registrable
Shares. The Company agrees to use its best efforts to cause the Mandatory S-1
Registration Statement to be declared effective as soon as possible but in no
event later than the date that is (i) one hundred fifteen (115) days following
the Closing Date in the event the Mandatory S-1 Registration Statement is not
reviewed by the SEC or (ii) one hundred forty-five (145) days following the
Closing Date in the event the Mandatory S-1 Registration Statement is reviewed
by the SEC (the "Mandatory Effective Date") (including filing with the SEC,
within three (3) Business Days of the date that the Company is notified (orally
or in writing, whichever is earlier) by the SEC that the Mandatory S-1
Registration Statement will not be "reviewed" or will not be subject to further
review, a request for acceleration of effectiveness in accordance with Rule 461
promulgated under the Securities Act (an "Acceleration Request"), which request
shall request an effective date that is within three (3) Business Days of the
date of such request). The Company shall notify each Investor in writing
promptly (and in any event within one (1) Business Day) after the Company's
submission of an Acceleration Request to the SEC. The Company shall be required
to keep the Mandatory S-1 Registration Statement continuously effective
(including through the filing of any required post-effective amendments) until
the earlier to occur of (i) the date after which all of the Registrable Shares
registered thereunder shall have been sold and (ii) the second (2nd) anniversary
of the later to occur of (a) the Closing Date and (b) the date on which each
Warrant has been exercised in full and after which by the terms of such Warrant
there are no additional Warrant Shares as to which the Warrant may become
exercisable; provided, that in either case such date shall be extended by the
amount of time of any Suspension Period (as defined below). Thereafter, the
Company shall be entitled to withdraw the Mandatory S-1 Registration Statement
and, upon such withdrawal, the Investors shall have no further right to offer or
sell any of the Registrable Shares pursuant to the Mandatory S-1 Registration
Statement (or any prospectus relating thereto).

         (b) Notwithstanding anything in this Section 2 to the contrary, if the
Company shall furnish to the Investors a certificate signed by the President,
Chief Executive Officer or Chief Operating Officer of the Company stating that

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the Board has made the good faith determination (i) that the continued use by
the Investors of the Mandatory S-1 Registration Statement for purposes of
effecting offers or sales of Registrable Shares pursuant hereto would require,
under the Securities Act and the rules and regulations promulgated thereunder,
premature disclosure in the Mandatory S-1 Registration Statement (or the
Prospectus relating thereto) of material, nonpublic information concerning the
Company, its business or prospects or any proposed material transaction
involving the Company, (ii) that such premature disclosure would be materially
adverse to the Company, its business or prospects or any such proposed material
transaction or would not be in the best interests of the Company and (iii) that
it is therefore essential to suspend the use by the Investors, of the Mandatory
S-1 Registration Statement (and the Prospectus relating thereto), then the right
of the Investors to use the Mandatory S-1 Registration Statement (and the
Prospectus relating thereto) for purposes of effecting offers or sales of
Registrable Shares pursuant thereto shall be suspended for a period (the
"Suspension Period") not greater than fifteen (15) consecutive Business Days
during any consecutive twelve (12) month period. During the Suspension Period,
the Investors shall not offer or sell any Registrable Shares pursuant to or in
reliance upon the Mandatory S-1 Registration Statement (or the Prospectus
relating thereto). The Company agrees that, as promptly as possible, but in no
event later than one (1) Business Day, after the consummation, abandonment or
public disclosure of the event or transaction that caused the Company to suspend
the use of the Mandatory S-1 Registration Statement (and the Prospectus relating
thereto) pursuant to this Section 2(b), the Company will as promptly as possible
lift any suspension, provide the Investors with revised Prospectuses, if
required, and will notify the Investors of their ability to effect offers or
sales of Registrable Shares pursuant to or in reliance upon the Mandatory S-1
Registration Statement.

         (c) It shall be a condition precedent to the obligations of the Company
to register Registrable Shares for the account of an Investor pursuant to this
Section 2 that such Investor furnish to the Company such information regarding
itself, the Registrable Shares held by it, and the method of disposition of such
Registrable Shares as shall be required by the Securities Act to effect the
registration of such Investor's Registrable Shares.

         (d) Notwithstanding anything in this Agreement to the contrary, the
Investors' sole remedy for the failure of the Company to file the Mandatory S-1
Registration Statement as promptly as possible after the date hereof, and in any
event on or prior to the Mandatory Filing Date, or for the failure of the
Company to make effective the Mandatory S-1 Registration Statement on or prior
to the Mandatory Effective Date, shall be the vesting of the Warrants as
provided for therein.

     2A. MANDATORY S-3 REGISTRATION RIGHTS.

         (a) If, at any time any Registrable Shares are not able to be resold
pursuant to an effective Registration Statement, (i) Form S-3 (or other
equivalent form) is then available for the registration of such Registrable
Shares and (ii) the Company shall receive from any Investor (including for this
purpose its Affiliates) who holds (or who together hold) at least twenty-five
percent (25%) of the then outstanding Registrable Shares a written request or
requests (a "Demand Notice") that the Company effect a registration on Form S-3
(a "Demand Registration"), or any successor or substitute form, with respect to

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all or a part of the Registrable Shares owned by such Investor(s), then the
Company will promptly give written notice of the proposed registration and the
Investor's or Investors' request therefor to all other Investors, and use best
efforts to effect such registration, as soon as practicable and in any event
within thirty (30) days, of all or such portion of such Investors' Registrable
Shares as are specified in such request, together with all or such portion of
the Registrable Shares of any other Investor or Investors joining in such
request as are specified in a written request given by such other Investor or
Investors within ten (10) Business Days after receipt of such written notice
from the Company; provided, however, that the Company may temporarily suspended
the use of such registration statement for the same reasons and on the same
terms as described in Section 2(b) above. The Company shall not be required to
effect more than three (3) registrations pursuant to this Section 2A(a) during
any consecutive twelve (12) month period.

         (b) It shall be a condition precedent to the obligations of the Company
to register Registrable Shares for the account of an Investor pursuant to this
Section 2A that such Investor furnish to the Company such information regarding
itself, the Registrable Shares held by it, and the method of disposition of such
Registrable Shares as shall be required by the Securities Act to effect the
registration of such Investor's Registrable Shares.

     3.  "PIGGYBACK" REGISTRATION.

         (a) If at any time any Registrable Shares are not able to be resold
pursuant to an effective Registration Statement, and the Company proposes to
register any of its Common Stock under the Securities Act, whether as a result
of an offering for its own account or the account of others (but excluding any
registrations to be effected on Forms S-4 or S-8 or other applicable successor
Forms), the Company shall, each such time, give to the Investors twenty (20)
days' prior written notice of its intent to do so, and such notice shall
describe the proposed registration and shall offer such Investors the
opportunity to register such number of Registrable Shares as each such Investor
may request. Upon the written request of any Investor given to the Company
within fifteen (15) days after the receipt of any such notice by the Company,
the Company shall include in such Registration Statement all or part of the
Registrable Shares of such Investor, to the extent requested to be registered.

         (b) If a registration pursuant to Section 3 hereof involves an
underwritten offering and the managing underwriter shall advise the Company in
writing that, in its opinion, the number of shares of Common Stock requested by
the Investors to be included in such registration is likely to affect materially
and adversely the success of the offering or the price that would be received
for any shares of Common Stock offered in such offering, then, notwithstanding
anything in this Section 3 to the contrary, the Company shall only be required
to include in such registration, to the extent of the number of shares of Common
Stock which the Company is so advised can be sold in such offering, (i) first,
the number of shares of Common Stock requested to be included in such
registration for the account of any stockholders of the Company (including the
Investors), pro rata among such stockholders on the basis of the number of
shares of Common Stock that each of them has requested to be included in such
registration, and (ii) second, any shares of Common Stock proposed to be
included in such registration for the account of the Company.

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         (c) In connection with any offering involving an underwriting of
shares, the Company shall not be required under this Section 3 or otherwise to
include the Registrable Shares of any Investor therein unless such Investor
accepts and agrees to the terms of the underwriting, which shall be reasonable
and customary, as agreed upon between the Company and the underwriters selected
by the Company.

         (d) It shall be a condition precedent to the obligations of the Company
to register Registrable Shares for the account of an Investor pursuant to this
Section 3 that such Investor furnish to the Company such information regarding
itself, the Registrable Shares held by it, and the method of disposition of such
Registrable Shares as shall be required by the Securities Act to effect the
registration of such Investor's Registrable Shares.

     4.  OBLIGATIONS OF THE COMPANY. In connection with the Company's
registration obligations hereunder, the Company shall, as expeditiously as
practicable:

         (a) furnish to each Investor copies of all documents filed with the SEC
prior to their being filed with the SEC, (ii) use commercially reasonable
efforts to cause its officers and directors, counsel and certified public
accountants to respond to such inquiries as shall be necessary, in the
reasonable opinion of such Investor, to conduct a reasonable investigation
within the meaning of the Securities Act, and (iii) notify the Investors of any
stop order issued or threatened by the SEC and use best efforts to prevent the
entry of such stop order or to remove it if entered.

         (b) prepare and file with the SEC such amendments and supplements,
including post-effective amendments, to each Registration Statement and the
Prospectus used in connection therewith as may be necessary to comply with the
Securities Act and to keep the Registration Statement continuously effective as
required herein, and prepare and file with the SEC such additional Registration
Statements as necessary to register for resale under the Securities Act all of
the Registrable Shares (including naming any permitted transferees of
Registrable Shares as selling stockholders in such Registration Statement); (ii)
cause any related Prospectus to be amended or supplemented by any required
Prospectus supplement, and as so supplemented or amended to be filed pursuant to
Rule 424; (iii) respond as promptly as possible to any comments received from
the SEC with respect to each Registration Statement or any amendment thereto and
as promptly as possible provide the Investors true and complete copies of all
correspondence from and to the SEC relating to the Registration Statement (other
than correspondence containing material nonpublic information); and (iv) comply
with the provisions of the Securities Act and the Exchange Act with respect to
the disposition of all Registrable Shares covered by such Registration Statement
as so amended or in such Prospectus as so supplemented.

         (c) Notify the Investors and Investors' counsel as promptly as
possible: (i) when the SEC notifies the Company whether there will be a "review"
of a Registration Statement and whenever the SEC comments in writing on such
Registration Statement and (ii) when a Registration Statement, or any
post-effective amendment or supplement thereto, has become effective, and after
the effectiveness thereof: (A) of any request by the SEC or any other federal or

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state governmental authority for amendments or supplements to the Registration
Statement or Prospectus or for additional information; (B) of the issuance by
the SEC or any state securities commission of any stop order suspending the
effectiveness of the Registration Statement covering any or all of the
Registrable Shares or the initiation of any proceedings for that purpose; and
(C) of the receipt by the Company of any notification with respect to the
suspension of the qualification or exemption from qualification of any of the
Registrable Shares for sale in any jurisdiction, or the initiation or
threatening of any proceeding for such purpose. Without limitation of any
remedies to which the Investors may be entitled under this Agreement, if any of
the events described in Section 4(c)(ii)(A), 4(c)(ii)(B), and 4(c)(ii)(C) occur,
the Company shall use best efforts to respond to and correct the event.

         (d) Notify the Investors and their counsel as promptly as possible of
the happening of any event as a result of which the Prospectus included in or
relating to a Registration Statement contains an untrue statement of a material
fact or omits any fact necessary to make the statements therein not misleading;
and, thereafter, the Company will as promptly as possible prepare (and, when
completed, give notice to each Investor) a supplement or amendment to such
Prospectus so that, as thereafter delivered to the purchasers of such
Registrable Shares, such Prospectus will not contain an untrue statement of a
material fact or omit to state any fact necessary to make the statements therein
not misleading; provided that upon such notification by the Company, the
Investors will not offer or sell Registrable Shares pursuant to such Prospectus
until the Company has notified the Investors that it has prepared a supplement
or amendment to such Prospectus and delivered copies of such supplement or
amendment to the Investors (it being understood and agreed by the Company that
the foregoing proviso shall in no way diminish or otherwise impair the Company's
obligation to as promptly as possible prepare a Prospectus amendment or
supplement as above provided in this Section 4(d) and deliver copies of same as
above provided in Section 4(h) hereof), and it being further understood that, in
the case of the Mandatory S-1 Registration Statement, any such period during
which the Investors are restricted from offering or selling Registrable Shares
shall constitute a Suspension Period.

         (e) Upon the occurrence of any event described in Section 4(d) hereof,
as promptly as possible, prepare a supplement or amendment, including a
post-effective amendment, to the Registration Statement or a supplement to the
related Prospectus or any document incorporated or deemed to be incorporated
therein by reference, and file any other required document so that, as
thereafter delivered, neither the Registration Statement nor such Prospectus
will contain an untrue statement of a material fact or omit to state a material
fact required to be stated therein or necessary to make the statements therein,
in light of the circumstances under which they are made, not misleading.

         (f) Use best efforts to avoid the issuance of or, if issued, obtain the
withdrawal of, (i) any order suspending the effectiveness of any Registration
Statement or (ii) any suspension of the qualification (or exemption from
qualification) of any of the Registrable Shares for sale in any jurisdiction, as
promptly as possible (it being understood that, in the case of the Mandatory S-1
Registration Statement, any period during which the effectiveness of the
Mandatory S-1 Registration Statement or the qualification of any Registrable
Shares is suspended shall constitute a Suspension Period).

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         (g) Furnish to the Investors and their counsel, without charge, at
least one conformed copy of each Registration Statement and each amendment
thereto, and all exhibits to the extent requested by such Investor or their
counsel (including those previously furnished or incorporated by reference) as
promptly as possible after the filing of such documents with the SEC.

         (h) As promptly as possible furnish to each selling Investor, without
charge, such number of copies of a Prospectus, including a preliminary
Prospectus, in conformity with the requirements of the Securities Act, and such
other documents (including, without limitation, Prospectus amendments and
supplements) as each such selling Investor may reasonably request in order to
facilitate the disposition of the Registrable Shares covered by such Prospectus
and any amendment or supplement thereto. The Company hereby consents to the use
of such Prospectus and each amendment or supplement thereto by each of the
selling Investors in connection with the offering and sale of the Registrable
Shares covered by such Prospectus and any amendment or supplement thereto to the
extent permitted by federal and state securities laws and regulations.

         (i) Use best efforts to register and qualify (or obtain an exemption
from such registration and qualification) the Registrable Shares under such
other securities or blue sky laws of the states of residence of each Investor
and such other jurisdictions as each Investor shall reasonably request, to keep
such registration or qualification (or exemption therefrom) effective during the
periods each Registration Statement is effective, and do any and all other acts
or things which may be reasonably necessary or advisable to enable each Investor
to consummate the public sale or other disposition of Registrable Shares in such
jurisdiction, provided that the Company shall not be required in connection
therewith or as a condition thereto to qualify to do business or to file a
general consent to service of process in any such states or jurisdictions where
it is not then qualified or subject to process.

         (j) Cooperate with the Investors to facilitate the timely preparation
and delivery of certificates representing the Registrable Shares to be delivered
to a transferee pursuant to a Registration Statement, which certificates shall
be free, to the extent permitted by the Securities Purchase Agreement and
applicable law, of all restrictive legends, and to enable such Registrable
Shares to be in such denominations and registered in such names as such
Investors may request.

         (k) Cooperate with any reasonable due diligence investigation
undertaken by the Investors, any managing underwriter participating in any
disposition pursuant to a Registration Statement, Investors' Counsel and any
attorney, accountant or other agent retained by Investors or any managing
underwriter, in connection with the sale of the Registrable Shares, including,
without limitation, making available any documents and information; provided,
however, that the Company will not deliver or make available to any Investor
material, nonpublic information unless such Investor specifically requests and
consents in advance in writing to receive such material, nonpublic information
and, if requested by the Company, such Investor agrees in writing to treat such
information as confidential.

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         (l) At the request of an Affiliate, the Company shall amend any
Registration Statement to include such Affiliate as a selling stockholder in
such Registration Statement.

         (m) Comply with all applicable rules and regulations of the SEC in all
material respects.

         (n) Prior to issuing any dividends on the shares of Series A Preferred
Stock payable in shares of Common Stock in an amount in excess of the Dividend
Shares, the Company will file a registration statement registering the resale of
such additional shares of Common Stock and such registration statement shall be
effective on the date such dividend is declared by the Board.

     5.  EXPENSES OF REGISTRATION. The Company shall pay for all expenses
incurred in connection with a registration pursuant to this Agreement and
compliance with Section 4 of this Agreement, including without limitation (i)
all registration, filing and qualification fees and expenses (including without
limitation those related to filings with the SEC, The NASDAQ Stock Market, or
any national securities exchange upon which the Company's securities are listed
and in connection with applicable state securities or blue sky laws), (ii) all
printing expenses, (iii) all messenger, telephone and delivery expenses incurred
by the Company, (iv) all fees and disbursements of counsel for the Company and
Investors' counsel, and (v) all fees and expenses of all other Persons retained
by the Company in connection with the consummation of the transactions
contemplated by this Agreement.

     6.  DELAY OF REGISTRATION. Subject to Section 11(d) hereof, the Investors
and the Company (other than with respect to Section 4(d) hereof) shall not take
any action to restrain, enjoin or otherwise delay any registration as the result
of any controversy which might arise with respect to the interpretation or
implementation of this Agreement.

     7.  INDEMNIFICATION. In the event that any Registrable Shares of the
Investors are included in a Registration Statement pursuant to this Agreement:

         (a) To the fullest extent permitted by law, the Company will indemnify
and hold harmless each Investor and each officer, director, fiduciary, agent,
investment advisor, employee, member (or other equity holder), general partner
and limited partner (and affiliates thereof) of such Investor, each broker,
underwriter or other person acting on behalf of such Investor and each person,
if any, who controls such Investor within the meaning of the Securities Act,
against any losses, claims, damages or liabilities, joint or several, (the
"Losses") to which they may become subject under the Securities Act or
otherwise, insofar as such Losses (or actions in respect thereof) arise out of
or relate to any untrue or alleged untrue statement of any material fact
contained in the Registration Statement, or arise out of or relate to the
omission or alleged omission to state therein a material fact required to be
stated therein, or necessary to make the statements therein not misleading, or
any violation by the Company of the Securities Act or state securities or blue
sky laws applicable to the Company and leading to action or inaction required of
the Company in connection with such registration or qualification under such
Securities Act or state securities or blue sky laws; and, subject to the
provisions of Section 7(c) hereof, the Company will reimburse on demand such

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Investor, such broker or other person acting on behalf of such Investor or such
officer, director, fiduciary, employee, member (or other equity holder), general
partner, limited partner, affiliate or controlling person for any legal or other
expenses reasonably incurred by any of them in connection with investigating or
defending any such Losses; provided, however, that the indemnity agreement
contained in this Section 7(a) shall not apply to amounts paid in settlement of
any such Losses if such settlement is effected without the consent of the
Company (which consent shall not be unreasonably withheld), nor shall the
Company be liable in any such case for any such Losses to the extent that it
solely arises out of or is based upon an untrue statement of any material fact
contained in the Registration Statement or omission to state therein a material
fact required to be stated therein or necessary to make the statements therein
not misleading, in each case to the extent that such untrue statement or alleged
untrue statement or omission or alleged omission was made in the Registration
Statement, in reliance upon and in conformity with written information furnished
by such Investor expressly for use in connection with such Registration
Statement.

         (b) To the fullest extent permitted by law, each Investor, severally
(as to itself) and not jointly, will indemnify and hold harmless the Company,
each of its directors, each of its officers who have signed the Registration
Statement, each person, if any, who controls the Company within the meaning of
the Securities Act, and all other Investors against any Losses to which the
Company or any such director, officer or controlling person or other Investor
may become subject to, under the Securities Act or otherwise, insofar as such
Losses (or actions in respect thereto) solely arise out of or are based upon any
untrue statement of any material fact contained in the Registration Statement,
or solely arise out of or relate to the omission to state therein a material
fact required to be stated therein or necessary to make the statements therein
not misleading, in each case to the extent that such untrue statement or alleged
untrue statement or omission or alleged omission was made in the Registration
Statement in reliance upon and in conformity with written information furnished
by such Investor expressly for use in connection with such Registration
Statement; and, subject to the provisions of Section 7(d) hereof, such Investor
will reimburse on demand any legal or other expenses reasonably incurred by the
Company or any such director, officer, controlling person, or other Investor in
connection with investigating or defending any such Losses, provided, however,
that the maximum aggregate amount of liability of such Investor under this
Section 7 shall be limited to the proceeds (net of underwriting discounts and
commissions, if any) actually received by such Investor from the sale of
Registrable Shares covered by such Registration Statement; and provided,
further, however, that the indemnity agreement contained in this Section 7(b) or
Section 7(e) shall not apply to amounts paid in settlement of any such Losses if
such settlement is effected without the consent of such Investor against which
the request for indemnity is being made (which consent shall not be unreasonably
withheld).

         (c) As promptly as possible after receipt by an indemnified party under
this Section 7 of notice of the threat, assertion or commencement of any action,
such indemnified party will, if a claim in respect thereof is to be made against
any indemnifying party under this Section 7, notify the indemnifying party in
writing of the commencement thereof and the indemnifying party shall have the
right to participate in and, to the extent the indemnifying party desires,
jointly with any other indemnifying party similarly noticed, to assume at its
expense the defense thereof with counsel mutually satisfactory to the parties;
provided, however, that, the failure to notify an indemnifying party promptly of

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the threat, assertion or commencement of any such action shall not relieve such
indemnifying party of any liability to the indemnified party under this Section
7 except (and only) to the extent that it shall be finally determined by a court
of competent jurisdiction (which determination is not subject to appeal or
further review) that such failure shall have proximately and materially
adversely prejudiced the indemnifying party.

         (d) If any indemnified party shall have reasonably concluded that there
may be one or more legal defenses available to such indemnified party which are
different from or additional to those available to the indemnifying party, or
that such claim or litigation involves or could have an effect upon matters
beyond the scope of the indemnity agreement provided in this Section 7, the
indemnifying party shall not have the right to assume the defense of such action
on behalf of such indemnified party, and such indemnifying party shall reimburse
such indemnified party and any person controlling such indemnified party for the
fees and expenses of counsel retained by the indemnified party which are
reasonably related to the matters covered by the indemnity agreement provided in
this Section 7. Subject to the foregoing, an indemnified party shall have the
right to employ separate counsel in any such action and to participate in the
defense thereof but the fees and expenses of such counsel shall not be at the
expense of the Company.

         (e) If the indemnification provided for in this Section 7 from the
indemnifying party is applicable by its terms but unavailable to an indemnified
party hereunder in respect of any Losses, then the indemnifying party, in lieu
of indemnifying such indemnified party, shall, subject to the maximum aggregate
liability of any Investor as set forth in Section 7(b), contribute to the amount
paid or payable by such indemnified party as a result of such Losses or expenses
in such proportion as is appropriate to reflect the relative fault of the
indemnifying party and indemnified party in connection with the actions which
resulted in such Losses or expenses, as well as any other relevant equitable
considerations. The relative faults of such indemnifying party and indemnified
party shall be determined by reference to, among other things, whether any
action in question, including any untrue or alleged untrue statement of a
material fact or omission or alleged omission to state a material fact, has been
made by, or relates to information supplied by, such indemnifying party or
indemnified party, and the parties' relative intent, knowledge, access to
information and opportunity to correct or prevent such action. The amount paid
or payable by a party as a result of the Losses and expenses referred to above
shall be deemed to include, subject to the limitations set forth in Sections
7(a), 7(b), 7(c) and 7(d), any legal or other fees, charges or expenses
reasonably incurred by such party in connection with any investigation or
proceeding. No person guilty of fraudulent misrepresentation (within the meaning
of Section 11(f) of the Securities Act) shall be entitled to contribution from
any person. The parties hereto agree that it would not be just and equitable if
contribution pursuant to this Section 7(e) were determined by pro rata
allocation or by any other method of allocation which does not take account of
the equitable considerations referred to in the this paragraph.

         (f) The indemnity and contribution agreements contained in this Section
are in addition to any liability that any indemnifying party may have to any
indemnified party.

     8.  REPORTS UNDER THE EXCHANGE ACT. With a view to making available to the
Investors the benefits of Rule 144 and any other rule or regulation of the SEC
that may at any time permit the Investors to sell the Registrable Shares to the
public without registration, the Company agrees to use best efforts to: (i) make

                                       11
<PAGE>

and keep public information available, as those terms are understood and defined
in Rule 144, (ii) file with the SEC in a timely manner all reports and other
documents required to be filed by an issuer of securities registered under the
Securities Act or the Exchange Act; (iii) as long as any Investor owns any
Conversion Shares, Warrant Shares or Dividend Shares, to furnish in writing upon
such Investor's request a written statement by the Company that it has complied
with the reporting requirements of Rule 144 and of the Securities Act and the
Exchange Act, and to furnish to such Investor a copy of the most recent annual
and quarterly reports of the Company, and such other reports and documents so
filed by the Company as may be reasonably requested in availing such Investor of
any rule or regulation of the SEC permitting the selling of any such Conversion
Shares, Warrant Shares or Dividend Shares without registration, and (iv)
undertake any additional actions reasonably necessary to maintain the
availability of a Registration Statement, including any successor or substitute
forms, or the use of Rule 144.

     9.  TRANSFER OF REGISTRATION RIGHTS. Each Investor may assign or transfer
any or all of its rights under this Agreement to any Person, provided such
assignee or transferee agrees in writing to be bound by the provisions hereof
that apply to such assigning or transferring Investor. Upon any such, and each
successive, assignment or transfer to any permitted assignee or transferee in
accordance with the terms of this Section 9, such permitted assignee or
transferee shall be deemed to be an "Investor" for all purposes of this
Agreement.

     10. ENTIRE AGREEMENT. This Agreement constitutes and contains the entire
agreement and understanding of the parties with respect to the subject matter
hereof, and it also supersedes any and all prior negotiations, correspondence,
agreements or understandings with respect to the subject matter hereof.

     11. MISCELLANEOUS.

         (a) This Agreement, and any right, term or provision contained herein,
may not be amended, modified or terminated, and no right, term or provision may
be waived, except with the written consent of (i) the holders of a majority of
the then outstanding Registrable Shares and (ii) the Company; provided that any
amendment or modification that is materially and disproportionately adverse to
any particular Investor (as compared to all Investors as a group) shall require
the consent of such Investor.

         (b) This Agreement shall be governed by and construed and enforced in
accordance with the laws of the State of New York. This Agreement shall be
binding upon the parties hereto and their respective heirs, personal
representatives, successors and permitted assigns and transferees, provided that
the terms and conditions of Section 9 hereof are satisfied. Notwithstanding
anything in this Agreement to the contrary, if at any time any Investor
(including any successors or assigned) shall cease to own any Registrable
Shares, all of such Investor's rights under this Agreement shall immediately
terminate.

         (c) Any notices to be given pursuant to this Agreement shall be in
writing and shall be given by certified or registered mail, return receipt
request. Notices shall be deemed given when personally delivered or when mailed
to the addresses of the respective parties as set forth on Exhibit A or Schedule

                                       12
<PAGE>

1 hereto, as applicable, or to such changed address of which any party may
notify the others pursuant hereto, except that a notice of change of address
shall be deemed given when received. An electronic communication ("Electronic
Notice") shall be deemed written notice for purposes of this Section 11(c) if
sent with return receipt requested to the electronic mail address specified by
the receiving party on Exhibit A or Schedule 1 hereto, as applicable. Electronic
Notice shall be deemed received at the time the party sending Electronic Notice
receives verification of receipt by the receiving party. Any party who does not
wish to receive notices as Electronic Notice shall include such request on
Schedule 1 hereto and shall be entitled to receive all notices in non-electronic
form.

         (d) The parties acknowledge and agree that in the event of any breach
of this Agreement, remedies at law will be inadequate, and each of the parties
hereto shall be entitled to specific performance of the obligations of the other
parties hereto and to such appropriate injunctive relief as may be granted by a
court of competent jurisdiction. All remedies, either under this Agreement or by
law or otherwise afforded to any of the parties, shall be cumulative and not
alternative.

         (e) This Agreement may be executed in a number of counterparts. All
such counterparts together shall constitute one Agreement, and shall be binding
on all the parties hereto notwithstanding that all such parties have not signed
the same counterpart. The parties hereto confirm that any facsimile copy of
another party's executed counterpart of this Agreement (or its signature page
thereof) will be deemed to be an executed original thereof.

         (f) Except as contemplated in Section 9 hereof, this Agreement is
intended solely for the benefit of the parties hereto and is not intended to
confer any benefits upon, or create any rights in favor of, any Person
(including, without limitation, any stockholder or debt holder of the Company)
other than the parties hereto.

         (g) If any provision of this Agreement is invalid, illegal or
unenforceable, such provision shall be ineffective to the extent, but only to
the extent of, such invalidity, illegality or unenforceability, without
invalidating the remainder of such provision or the remaining provisions of this
Agreement, unless such a construction would be unreasonable.

                            [Signature Pages Follow]

                                       13
<PAGE>

         IN WITNESS WHEREOF, the parties hereto have executed this Registration
Rights Agreement as of the date and year first above written.

             MOTIENT CORPORATION

             By:   /s/ Christopher Downie
                   -------------------------------------
                   Christopher Downie,
                   Executive Vice President and Chief
                   Operating Officer

                   Glenview Capital Partners, L.P.
                   By:        /s/ Richard Battera
                              --------------------------------------------------
                   Name:      Richard Battera
                   Title:     Managing Member of Glenview Capital Management

                   Glenview Institutional Partners, L.P.
                   By:        /s/ Richard Battera
                              --------------------------------------------------
                   Name:      Richard Battera
                   Title:     Managing Member of Glenview Capital Management

                   Glenview Capital Master Fund, Ltd.
                   By:        /s/ Richard Battera
                              --------------------------------------------------
                   Name:      Richard Battera
                   Title:     Managing Member of Glenview Capital Management

                   GCM Little Arbor Institutional Partners, L.P.
                   By:        /s/ Richard Battera
                              --------------------------------------------------
                   Name:      Richard Battera
                   Title:     Managing Member of Glenview Capital Management

                   GCM Little Arbor Master Fund, Ltd.
                   By:        /s/ Richard Battera
                              --------------------------------------------------
                   Name:      Richard Battera
                   Title:     Managing Member of Glenview Capital Management

               [SIGNATURE PAGE TO REGISTRATION RIGHTS AGREEMENT]

<PAGE>

                   OZ Master Fund, Ltd.
                   By:        /s/ Joel Frank
                              --------------------------------------------------
                   Name:      Joel Frank
                   Title:     Member and CFO

                   Fleet Maritime, Inc.
                   By:        /s/ Joel Frank
                              --------------------------------------------------
                   Name:      Joel Frank
                   Title:     Member and CFO

                   Highland Equity Focus Fund, L.P.
                   By:        /s/ James Dondero
                              --------------------------------------------------
                   Name:      James Dondero
                   Title:     President Highland Capital Management, L.P.

                   Highland Crusader Offshore Partners, L.P.
                   By:        Highland Capital Management, L.P.
                   By:        /s/ James Dondero
                              --------------------------------------------------
                   Name:      James Dondero
                   Title:     President Highland Capital Management, L.P.

                   Highland Capital Management Services, Inc.
                   By:        /s/ James Dondero
                              --------------------------------------------------
                   Name:      James Dondero
                   Title:     President Highland Capital Management, L.P.

                   Highland Capital Management L.P.
                   By:        /s/ James Dondero
                              --------------------------------------------------
                   Name:      James Dondero
                   Title:     President Highland Capital Management, L.P.

                   Greywolf Capital Partners II LP
                   By:        /s/ John Santz
                              --------------------------------------------------
                   Name:      John Santz
                   Title:     Partner

                   Greywolf Capital Overseas Fund
                   By:        /s/ John Santz
                              --------------------------------------------------
                   Name:      John Santz
                   Title:     Partner

               [SIGNATURE PAGE TO REGISTRATION RIGHTS AGREEMENT]

<PAGE>

                   York Capital Management, L.P.
                   By:        /s/ Adam J. Sanler
                              --------------------------------------------------
                   Name:      Adam J. Sanler
                   Title:     CFO

                   York Select, L.P.
                   By:        /s/ Adam J. Sanler
                              --------------------------------------------------
                   Name:      Adam J. Sanler
                   Title:     CFO

                   York Investment Limited
                   By:        /s/ Adam J. Sanler
                              --------------------------------------------------
                   Name:      Adam J. Sanler
                   Title:     CFO of its Investment Manager

                   York Select Unit Trust
                   By:        /s/ Adam J. Sanler
                              --------------------------------------------------
                   Name:      Adam J. Sanler
                   Title:     CFO of its Investment Manager

                   York Credit Opportunities Fund, L.P.
                   By:        /s/ Name
                              --------------------------------------------------
                   Name:      Name
                   Title:     Senior Managing Director

                   York Global Value Partners, L.P.
                   By:        /s/ Name
                              --------------------------------------------------
                   Name:      Name
                   Title:     Senior Managing Director

                   York/Green Capital Partners, L.P.
                   By:        /s/ Adam J. Sanler
                              --------------------------------------------------
                   Name:      Adam J. Sanler
                   Title:     CFO

               [SIGNATURE PAGE TO REGISTRATION RIGHTS AGREEMENT]

<PAGE>

                   Rockbay Capital Institutional Fund, LLC
                   By:        /s/ Atul Khanna
                              --------------------------------------------------
                   Name:      Atul Khanna
                   Title:     CEO of Rockbay Capital Advisors, Inc.

                   Rockbay Capital Offshore Fund, Ltd.
                   By:        /s/ Atul Khanna
                              --------------------------------------------------
                   Name:      Atul Khanna
                   Title:     CEO of Rockbay Capital Advisors, Inc.

                   LC Capital Master Fund, Ltd.
                   By:        /s/ Richard F. Conway
                              --------------------------------------------------
                   Name:      Richard F. Conway
                   Title:     Director

                   Strome Offshore Ltd.
                   By:        /s/ Mark E. Strome
                              --------------------------------------------------
                   Name:      Mark E. Strome
                   Title:     Director

                   Strome Alpha Fund, L.P.
                   By:        /s/ Mark E. Strome
                              --------------------------------------------------
                   Name:      Mark E. Strome
                   Title:     General Partner

                   Millennium Partners, L.P.
                   By:        Millenium Management, L.L.C.
                   By:        /s/ Terry Feeney
                              --------------------------------------------------
                   Name:      Terry Feeney
                   Title:     Chief Operating Officer

                   Goldman Sachs & Co.
                   By:        /s/ Albert Dombrowski
                              --------------------------------------------------
                   Name:      Albert Dombrowski
                   Title:     Authorized Signatory

                   Jana Master Fund, Ltd.
                   By:        /s/ Mark Lehmann
                              --------------------------------------------------
                   Name:      Mark Lehmann
                   Title:     Partner

               [SIGNATURE PAGE TO REGISTRATION RIGHTS AGREEMENT]

<PAGE>

                   Lyxor/Jana Partners
                   By:        Lyxor/Jana Partners
                              --------------------------------------------------
                   Name:      Joel Brebbia
                   Title:     CFO

                   Ore Hill Hub Fund, Ltd.
                   By:        /s/ Frederick J. Wahl
                              --------------------------------------------------
                   Name:      Frederick J. Wahl
                   Title:     Managing Member

                   Portfolio Logic LLC
                   By:        /s/ Jeffrey D. Zients
                              --------------------------------------------------
                   Name:      Jeffrey D. Zients
                   Title:     Managing Member

                   Eton Park Fund, L.P.
                   By:        /s/ Stu Hendel
                              --------------------------------------------------
                   Name:      Stu Hendel
                   Title:     COO

                   Eton Park Master Fund, Ltd.
                   By:        /s/ Stu Hendel
                              --------------------------------------------------
                   Name:      Stu Hendel
                   Title:     COO

                   Loeb Partners Corp.
                   By:        /s/ Name
                              --------------------------------------------------
                   Name:      Name
                   Title:     Vice President

                   Long Meadow Holdings, LP
                   By:        /s/ Johnathan W. Old
                              --------------------------------------------------
                   Name:      Johnathan W. Old
                   Title:     Managing Member of Meadow Investment LLC

                   Stanfield Offshore Leveraged Assets, Ltd.
                   By:        Stanfield Capital Partners, LLC
                   By:        /s/ Chris Pucillo
                              --------------------------------------------------
                   Name:      Chris Pucillo
                   Title:     Portfolio Manager and Partner

               [SIGNATURE PAGE TO REGISTRATION RIGHTS AGREEMENT]

<PAGE>

                   Harbert Distressed Investment Master Fund, Ltd.
                   By:        HMC Distressed Investment Offshore Manager, LLC
                   By:        /s/ Name
                              --------------------------------------------------
                   Name:      Name
                   Title:     Vice President

                   Alpha US Sub Fund VI, LLC
                   By:        Harbert Fund Advisors, Inc.
                   By:        /s/ Name
                              --------------------------------------------------
                   Name:      Name
                   Title:     Vice President

               [SIGNATURE PAGE TO REGISTRATION RIGHTS AGREEMENT]Exhibit 10.3

NEITHER THIS WARRANT NOR THE SHARES  ISSUABLE UPON EXERCISE OF THIS WARRANT HAVE
BEEN  REGISTERED  UNDER THE  SECURITIES  ACT OF 1933, AS AMENDED,  OR APPLICABLE
STATE  SECURITIES  LAWS AND NEITHER  THIS WARRANT NOR THE SHARES  ISSUABLE  UPON
EXERCISE OF THIS  WARRANT  MAY BE SOLD OR  TRANSFERRED  UNLESS THE  REGISTRATION
PROVISIONS  OF THE SAID ACT AND  APPLICABLE  STATE  SECURITIES  LAWS  HAVE  BEEN
COMPLIED WITH OR UNLESS COMPLIANCE WITH SUCH PROVISIONS IS NOT REQUIRED.

                                                                  April 15, 2005

                               MOTIENT CORPORATION

                          COMMON STOCK PURCHASE WARRANT

Void after April 15, 2010

     This Warrant (the "Warrant") entitles ______________ (including any
successors or assigns, the "Holder"), for value received, to purchase from
MOTIENT CORPORATION, a Delaware corporation, at any time and from time to time,
subject to the terms and conditions set forth herein, during the period starting
from 5:00 a.m. on the Initial Exercise Date (as defined in Section 1 below) to
5:00 p.m., Eastern time, on the Expiration Date (as defined in Section 1 below),
at which time this Warrant shall expire and become void, all or any portion of
the vested Warrant Shares at the Exercise Price (as defined in Section 1 below).
This Warrant also is subject to the following terms and conditions:

     1. Definitions. As used in this Warrant, the following terms shall have the
respective meanings set forth below or elsewhere in this Warrant as referred to
below:

     "Affiliate" means any Person that, directly or indirectly, through one or
more intermediaries, controls, is controlled by, or is under common control
with, a Person, as such terms are used and construed under Rule 144, and any
Person (or group of Persons) who share(s) voting or investment power or is (are)
deemed a beneficial owner(s), as such terms are used and construed under Rule
13d-3 of the rules and regulations promulgated under the Securities Exchange Act
of 1934, as amended, including, without limitation, any Person that serves as a
general partner and/or investment adviser or in a similar capacity of a Person.

     "Business Day" means any day except Saturday, Sunday and any day which
shall be a federal legal holiday or a day on which banking institutions in the
State of New York are authorized or required by law or other governmental action
to close.

<PAGE>

     "Common Stock" means the common stock, $0.01 par value per share, of the
Company (including any securities into which or for which such shares may be
exchanged for, or converted into, pursuant to any stock dividend, stock split,
stock combination, recapitalization, reclassification, reorganization or other
similar event).

     "Company" means Motient Corporation, a Delaware corporation.

     "Mandatory Effectiveness Date" means the date that is the earlier of (i)
August 8, 2005 in the event the Mandatory Registration Statement is not reviewed
by the SEC, (ii) September 7, 2005 in the event the Mandatory Registration
Statement is reviewed by the SEC (including, in either case, filing with the
SEC, within three (3) Business Days of the date that the Company is notified
(orally or in writing, whichever is earlier) by the SEC that the Mandatory
Registration Statement will not be "reviewed" or will not be subject to further
review a request for acceleration of effectiveness in accordance with Rule 461
promulgated under the Securities Act, which request shall request an effective
date that is within three (3) Business Days of the date of such request)

     "Exercise Price" means, $26.51 per share of Common Stock, as applicable and
as adjusted from time to time pursuant to the terms of this Warrant.

     "Expiration Date" means April 15, 2010.

     "Fair Market Value" shall mean (i) if the Common Stock is traded on Nasdaq,
then the last reported sale price per share of Common Stock on The NASDAQ Stock
Market or any national securities exchange in which such Common Stock is quoted
or listed, as the case may be, on the date immediately preceding each date the
Warrant is exercised or, if no such sale price is reported on such date, such
price on the next preceding Business Day in which such price was reported, (ii)
if the Common Stock is actively traded over-the-counter, then the average of the
closing bid and asked prices over the five (5) trading days ended on the trading
day immediately preceding each date the Warrant is exercised or (iii) if such
Common Stock is not traded, quoted or listed on The NASDAQ Stock Market or any
national securities exchange or the over-the-counter market, then the fair
market value of a share of Common Stock, as determined in good faith by the
Board of Directors of the Company.

     "Filing Deadline Date" means June 24, 2005.

     "Holder" has the meaning set forth in the preamble of this Warrant.

     "Initial Exercise Date" means the date on which this Warrant first vests in
accordance with Section 2.1 hereof.

     "Mandatory Registration Statement" means the registration statement on Form
S-1 filed with the SEC for the purpose of registering under the Securities Act
all of the Warrant Shares and the shares of Common Stock issuable upon
conversion or redemption of the Shares or issued as a dividend on the Shares.

                                       2
<PAGE>

     "Person" (whether or not capitalized) means an individual, entity,
partnership, limited liability company, corporation, association, trust, joint
venture, unincorporated organization, and any government, governmental
department or agency or political subdivision thereof.

     "Securities Act" means the Securities Act of 1933, as amended.

     "SEC" means the Securities and Exchange Commission.

     "Shares" means the shares of Series A Preferred Stock issued pursuant to
the Securities Purchase Agreement.

     "Securities Purchase Agreement" means that certain Securities Purchase
Agreement dated as of the date hereof, by and between the Company and the other
parties thereto.

     "Warrant Shares" means an aggregate of _______________ shares of Common
Stock, after giving effect to all adjustments thereto provided for herein,
including, without limitation, those set forth in Section 4 hereof.

     2.  Exercise of Warrant.

         2.1 Method of Exercise; Vesting. Subject to all of the terms and
conditions hereof (including the vesting provisions set forth below), this
Warrant may be exercised in whole or in part, with respect to then vested
Warrant Shares, at any time and from time to time during the period commencing
on the Initial Exercise Date and ending on the Expiration Date. Exercise shall
be by presentation and surrender to the Company at its principal office, or to
the transfer agent of the Company, of this Warrant and the notice and
subscription form annexed hereto, executed by the Holder, which shall indicate
the number of shares for which the Holder intends to exercise this Warrant,
together with payment to the Company in accordance with Section 3 hereof in an
amount equal to the product of the Exercise Price multiplied by the number of
Warrant Shares being purchased upon such exercise. Upon and as of receipt by the
Company (or the transfer agent) of such properly completed and duly executed
purchase form accompanied by payment as herein provided, the Holder shall be
deemed to be the Holder of record of the Warrant Shares issuable upon such
exercise, notwithstanding that the stock transfer books of the Company shall
then be closed or that certificates representing such Warrant Shares shall not
then actually be, or have been, delivered to the Holder.

     The Company and the Holder agree that in the event (i) the Mandatory
Registration Statement has not been filed with the SEC by the Filing Deadline
Date, (ii) the Mandatory Registration Statement has not been declared effective
by the SEC by the Mandatory Effectiveness Date or (iii) the Mandatory
Registration Statement is filed and declared effective but shall thereafter
cease to be effective (without being succeeded immediately by an additional
registration statement filed and declared effective) or usable for the offer and
sale of the securities registered thereby for a period of time that shall exceed

                                       3
<PAGE>

30 days in the aggregate in any twelve-month period (each of the events of a
type described in the foregoing clauses (i) through (iii) are individually
referred to herein as an "Event," and the Filing Deadline Date in the case of
clause (i), the Mandatory Effectiveness Date in the case of clause (ii), the
date on which the duration of the ineffectiveness or unusability of the
Mandatory Registration Statement in any period exceeds the number of days
permitted by clause (iii), being referred to herein as an "Event Date"), the
Warrant will vest at the rate set forth below. Events shall be deemed to
continue until the following dates with respect to the respective types of
Events: the date the Mandatory Registration Statement is filed in the case of an
Event of the type described in clause (i), the date the Mandatory Registration
Statement is declared effective under the Securities Act in the case of an Event
of the type described in clause (ii), and the date the Mandatory Registration
Statement becomes effective or usable again in the case of an Event of the type
described in clause (iii).

     This Warrant shall first become exercisable ("vest") with respect to
Warrant Shares commencing on (and including) any Event Date and will cease
vesting on (but excluding) the next date on which there are no Events that have
occurred and are continuing (a "Vesting Period"). This Warrant will continue to
vest at any time, and from time to time, on which an Event has occurred and is
continuing until such time as all Warrant Shares have vested. This Warrant will
vest only during the Vesting Period and at a daily rate of 1/365th of the
Warrant Shares (such that the Warrant will be fully vested if the aggregate
number of days during all Vesting Periods is 365 days), but only to the extent
that, after giving effect to such vesting, such vesting will not result in the
Holder (together with its Affiliates) owning, holding or beneficially owning
more than 9.99% of the Common Stock (the "Ownership Limit"), and at any time,
and from time to time, if the Holder (together with its Affiliates) owns, holds
or beneficially owns a percentage less than the Ownership Limit, then this
Warrant shall thereafter vest or continue to vest, first with respect to any
Warrant Shares that would have vested in accordance with the terms hereof but
for the Ownership Limit and second, otherwise in accordance with the terms
hereof, but in each case, again, only to the extent that, after giving effect to
such vesting, such vesting will not result in the Holder (together with its
Affiliates) owning, holding or beneficially owning more than the Ownership
Limit; provided further that if this Warrant does not vest and become
exercisable for any Warrant Shares in accordance with this paragraph, then this
Warrant shall become null and void. This Warrant will be exercisable with
respect to all vested but unexercised Warrant Shares until the Expiration Date.

         2.2 Delivery of Stock Certificates on Exercise. As soon as practicable
after the exercise of this Warrant, and in any event within three (3) Business
Days thereafter, the Company, at its expense, and in accordance with applicable
securities laws, will cause to be issued in the name of and delivered to the
Holder, or as the Holder may direct (subject in all cases, to the provisions of
Section 9 hereof), a certificate or certificates for the number of Warrant
Shares purchased by the Holder on such exercise, plus, in lieu of any fractional
share to which the Holder would otherwise be entitled, cash equal to such
fraction multiplied by the Fair Market Value.

         2.3 Shares To Be Fully Paid and Nonassessable. All Warrant Shares
issued upon the exercise of this Warrant shall be validly issued, fully paid and

                                       4
<PAGE>

nonassessable, free of all liens, taxes, charges and other encumbrances or
restrictions on sale (other than those set forth herein).

         2.4 Fractional Shares. No fractional shares of Common Stock or scrip
representing fractional shares of Common Stock shall be issued upon the exercise
of this Warrant. With respect to any fraction of a share of Common Stock called
for upon any exercise hereof, the Company shall make a cash payment to the
Holder as set forth in Section 2.2 hereof.

         2.5 Issuance of New Warrants; Company Acknowledgment. Upon any partial
exercise of this Warrant, the Company, at its expense, will forthwith and, in
any event within three (3) Business Days, issue and deliver to the Holder a new
warrant or warrants of like tenor, registered in the name of the Holder,
exercisable, in the aggregate, for the balance of the Warrant Shares. Moreover,
the Company shall, at the time of any exercise of this Warrant, upon the request
of the Holder, acknowledge in writing its continuing obligation to afford to the
Holder any rights to which the Holder shall continue to be entitled after such
exercise in accordance with the provisions of this Warrant; provided, however,
that if the Holder shall fail to make any such request, such failure shall not
affect the continuing obligation of the Company to afford to the Holder any such
rights.

         2.6 Payment of Taxes and Expenses. The Company shall pay any recording,
filing, stamp or similar tax which may be payable in respect of any transfer
involved in the issuance of, and the preparation and delivery of certificates
(if applicable) representing, (i) any Warrant Shares purchased upon exercise of
this Warrant and/or (ii) new or replacement warrants in the Holder's name or the
name of any transferee of all or any portion of this Warrant.

     3.  Payment of Exercise Price. The Exercise Price for the Warrant Shares
being purchased may be paid (i) in cash, by certified check or by wire transfer
to an account designated in writing by the Company, (ii) by cancellation of
indebtedness owing from the Company to the Holder, (iii) by the Holder
surrendering a number of Warrant Shares having a Fair Market Value on the date
of exercise equal to, greater than (but only if by a fractional share) or less
than the required aggregate Exercise Price, in which case the Holder shall
receive the number of Warrant Shares to which it would otherwise be entitled
upon such exercise, less the surrendered shares, or (iv) any combination of the
methods described in the foregoing clauses (i), (ii) and (iii).

     4.  Adjustment of Exercise Price. The Exercise Price shall be subject to
adjustment from time to time upon the happening of certain events as follows:

         4.1. Subdivision or Combination of Stock. If at any time or from time
to time after the date hereof, the Company shall subdivide (by way of stock
dividend, stock split or otherwise) its outstanding shares of Common Stock, the
Exercise Price in effect immediately prior to such subdivision shall be reduced
proportionately and the number of Warrant Shares (calculated to the nearest
whole share) shall be increased proportionately, and conversely, in the event
the outstanding shares of Common Stock shall be combined (whether by stock

                                       5
<PAGE>

combination, reverse stock split or otherwise) into a smaller number of shares,
the Exercise Price in effect immediately prior to such combination shall be
increased proportionately and the number of Warrant Shares (calculated to the
nearest whole share) shall be decreased proportionately. The Exercise Price and
the number of Warrant Shares, as so adjusted, shall be readjusted in the same
manner upon the happening of any successive event or events described in this
Section 4.1.

         4.2 Adjustment for Stock Dividends. If at any time after the date
hereof, the Company shall declare a dividend or make any other distribution upon
any class or series of stock of the Company payable in shares of Common Stock or
securities convertible into shares of Common Stock, the Exercise Price and the
number of Warrant Shares to be obtained upon exercise of this Warrant shall be
adjusted proportionately to reflect the issuance of any shares of Common Stock
or convertible securities, as the case may be, issuable in payment of such
dividend or distribution. The Exercise Price and the number of Warrant Shares,
as so adjusted, shall be readjusted in the same manner upon the happening of any
successive event or events described in this Section 4.2. For the purposes of
clarity, no adjustment shall be made with respect to the payment of a dividend
of stock purchase rights in connection with the issuance of up to approximately
$21.4 million of shares of Common Stock at a per share price of $8.57 pursuant
to a follow on rights offering to certain of the Company's existing
stockholders, for which the record date for payment of such dividend was
December 14, 2004 but such dividend has not yet been paid.

         4.3 Adjustments for Reclassifications. If the Common Stock issuable
upon the conversion of this Warrant shall be changed into the same or a
different number of shares of any class(es) or series of stock, whether by
reclassification or otherwise (other than an adjustment under Section 4.1 and
Section 4.2 or a merger, consolidation, or sale of assets provided for under
Section 4.4), then and in each such event, the Holder hereof shall have the
right thereafter to convert each Warrant Share into the kind and amount of
shares of stock and other securities and property receivable upon such
reclassification, or other change by holders of the number of shares of Common
Stock into which such Warrant Shares would have been convertible immediately
prior to such reclassification or change, all subject to successive adjustments
thereafter from time to time pursuant to and in accordance with, the provisions
of this Section 4.

         4.4 Adjustments for Merger or Consolidation. In the event that, at any
time or from time to time after the date hereof, the Company shall (a) effect a
reorganization, (b) consolidate with or merge into any other Person, or (c) sell
or transfer all or substantially all of its properties or assets or more than
50% of the voting capital stock of the Company (whether issued and outstanding,
newly issued, from treasury, or any combination thereof) to any other person
under any plan or arrangement contemplating the consolidation or merger, sale or
transfer, or dissolution of the Company, then, in each such case, the Holder,
upon the exercise of this Warrant as provided in Section 2.1 hereof at any time
or from time to time after the consummation of such reorganization,
consolidation, merger or sale or the effective date of such dissolution, as the
case may be, shall receive, in lieu of the Warrant Shares issuable on such
exercise immediately prior to such consummation or such effective date, as the
case may be, the stock and property (including cash) to which the Holder would

                                       6
<PAGE>

have been entitled upon the consummation of such consolidation or merger, or
sale or transfer, or in connection with such dissolution, as the case may be, if
the Holder had so exercised this Warrant immediately prior thereto (assuming the
payment by the Holder of the Exercise Price therefor as required hereby in a
form permitted hereby, which payment shall be included in the assets of the
Company for the purposes of determining the amount available for distribution),
all subject to successive adjustments thereafter from time to time pursuant to,
and in accordance with, the provisions of this Section 4. The Company shall not
effect any such consolidation, merger or sale unless prior to the consummation
thereof the successor entity (if other than the Company) resulting from such
consolidation or merger or the entity purchasing such assets assumes by written
instrument (in form and substance reasonably satisfactory to the Holder) the
obligation to deliver the stock or property (including cash) as, in accordance
with the foregoing provisions, the Holder may be entitled to acquire.

         4.5 Continuation of Terms. Upon any reorganization,
consolidation, merger or transfer (and any dissolution following any such
transfer) referred to in this Section 4, this Warrant shall continue in full
force and effect and the terms hereof shall be applicable to the shares of
Common Stock and other securities and property receivable upon the exercise of
this Warrant after the consummation of such reorganization, consolidation or
merger or the effective date of dissolution following any such transfer, as the
case may be, and shall be binding upon the issuer of any such Common Stock or
other securities, including, in the case of any such transfer, the Person
acquiring all or substantially all of the properties or assets or more than 50%
of the voting capital stock of the Company (whether issued and outstanding,
newly issued or from treasury or any combination thereof), whether or not such
Person shall have expressly assumed the terms of this Warrant.

         4.6 Certificate as to Adjustments. Upon the occurrence of each
adjustment or readjustment of the Exercise Price and number of Warrant Shares
pursuant to this Section 4, this Warrant shall, without any action on the part
of the Holder, be adjusted in accordance with this Section 4, and the Company,
at its expense, promptly shall compute such adjustment or readjustment in
accordance with the terms hereof and prepare and furnish to the Holder a
certificate setting forth such adjustment or readjustment, showing in detail the
facts upon which such adjustment or readjustment is based. The Company will
forthwith send a copy of each such certificate to the Holder in accordance with
Section 11.4 below.

     5.  Registration Rights. The Warrant Shares shall be entitled to
registration rights and all other rights as applicable to such shares in
accordance with that certain Registration Rights Agreement, dated as of the date
hereof, as amended, by and among the Company and the Investors named therein.

     6.  Notices of Record Date. Upon (a) any establishment by the Company of a
record date of the holders of Common Stock for the purpose of determining the
holders thereof who are entitled to receive any dividend or other distribution,
or right or option to acquire securities of the Company, or any other right, or
(b) any capital reorganization, reclassification, recapitalization, merger or
consolidation of the Company with or into any other corporation, any transfer of

                                       7
<PAGE>

all or substantially all the assets of the Company, or any voluntary or
involuntary dissolution, liquidation or winding up of the Company, or the sale,
in a single transaction, of a majority of the Company's voting stock (whether
newly issued, or from treasury, or previously issued and then outstanding, or
any combination thereof), the Company shall mail to the Holder at least ten (10)
Business Days, or such longer period as may be required by law, prior to the
record date specified therein, a notice specifying (i) the date established as
the record date for the purpose of such dividend, distribution, option or right
and a description of such dividend, distribution, option or right, (ii) the date
on which any such reorganization, reclassification, transfer, consolidation,
merger, dissolution, liquidation or winding up, or sale is expected to become
effective and (iii) the date, if any, fixed as to when the holders of record of
Common Stock shall be entitled to exchange their shares of Common Stock for
securities or other property deliverable upon such reorganization,
reclassification, transfer, consolidation, merger, dissolution, liquidation or
winding up.

     7.  Exchange of Warrant. Subject to the provisions of Section 9 hereof (if
and to the extent applicable), this Warrant shall be exchangeable, upon the
surrender hereof by the Holder at the principal office of the Company, for new
warrants of like tenor, each registered in the name of the Holder or in the name
of such other persons as the Holder may direct (upon payment by the Holder of
any applicable transfer taxes). Each of such new warrants shall be exercisable
for such number of Warrant Shares as the Holder shall direct, provided that all
of such new warrants shall represent, in the aggregate, the right to purchase
the same number of Warrant Shares and cash, securities or other property, if
any, which may be purchased by the Holder upon exercise of this Warrant at the
time of its surrender.

     8.  No Dilution or Impairment. The Company will not, by amendment of its
Certificate of Incorporation or Bylaws or through any reorganization, transfer
of assets, consolidation, merger, dissolution, issue or sale of securities or
any other voluntary action, avoid or seek to avoid the observance or performance
of any of the terms of this Warrant, but will at all times in good faith assist
in the carrying out of all such terms and in the taking of all action as may be
necessary or appropriate in order to protect the rights of the Holder against
dilution, or other impairment.

     9.  Transfer Provisions, etc.

         9.1 Legends. Subject to Section 6.2 of the Securities Purchase
Agreement, each certificate representing any Warrant Shares issued upon exercise
of this Warrant shall bear the following legend:

     "THE SHARES EVIDENCED  HEREBY WERE ORIGINALLY  ISSUED IN A TRANSACTION
     EXEMPT FROM  REGISTRATION  UNDER THE UNITED STATES  SECURITIES  ACT OF
     1933,  AS AMENDED (THE  "SECURITIES  ACT"),  AND THE SHARES  EVIDENCED
     HEREBY  MAY NOT BE  OFFERED,  SOLD  OR  OTHERWISE  TRANSFERRED  IN THE
     ABSENCE OF SUCH  REGISTRATION  OR AN APPLICABLE  EXEMPTION  THEREFROM.
     EACH PURCHASER OF THE SHARES

                                       8
<PAGE>

     EVIDENCED  HEREBY IS HEREBY NOTIFIED THAT THE SELLER MAY BE RELYING ON
     THE EXEMPTION FROM THE PROVISIONS OF SECTION 5 OF THE SECURITIES  ACT.
     THE HOLDER OF THE SHARES  EVIDENCED  HEREBY  AGREES FOR THE BENEFIT OF
     THE ISSUER  THAT (A) SUCH SHARES MAY BE RESOLD,  PLEDGED OR  OTHERWISE
     TRANSFERRED  ONLY (1) (a) IN THE  UNITED  STATES  TO A PERSON  WHO THE
     SELLER  REASONABLY  BELIEVES  IS A QUALIFIED  INSTITUTIONAL  BUYER (AS
     DEFINED  IN RULE  144A  UNDER  THE  SECURITIES  ACT) IN A  TRANSACTION
     MEETING THE  REQUIREMENTS  OF RULE 144A, (b) OUTSIDE THE UNITED STATES
     IN AN  OFFSHORE  TRANSACTION  IN  ACCORDANCE  WITH  RULE 904 UNDER THE
     SECURITIES ACT, (c) IN A TRANSACTION  MEETING THE REQUIREMENTS OF RULE
     144  UNDER THE  SECURITIES  ACT,  OR (d) IN  ACCORDANCE  WITH  ANOTHER
     EXEMPTION  FROM THE  REGISTRATION  REQUIREMENTS  OF THE SECURITIES ACT
     (AND BASED UPON AN  OPINION  OF  COUNSEL  IF  MOTIENT  CORPORATION  SO
     REQUESTS),  (2) TO MOTIENT CORPORATION OR (3) PURSUANT TO AN EFFECTIVE
     REGISTRATION  STATEMENT  AND,  IN EACH OF (1),  (2) OR (3)  ABOVE,  IN
     ACCORDANCE  WITH ANY  APPLICABLE  SECURITIES  LAWS OF ANY STATE OF THE
     UNITED STATES OR ANY OTHER APPLICABLE  JURISDICTION AND (B) THE HOLDER
     WILL, AND EACH  SUBSEQUENT  HOLDER IS REQUIRED TO NOTIFY ANY PURCHASER
     FROM IT OF THE SHARES EVIDENCED HEREBY OF THE RESALE  RESTRICTIONS SET
     FORTH IN (A) ABOVE."

         9.2 Mechanics of Transfer.

               (a) Any transfer of all or any portion of this Warrant (and the
Warrant Shares), or of any interest herein or therein, that is otherwise in
compliance with applicable law shall be effected by surrendering this Warrant to
the Company at its principal office, together with a duly executed form of
assignment, in the form attached hereto. In the event of any such transfer of
this Warrant, the Company shall issue a new warrant or warrants of like tenor to
the transferee(s), representing, in the aggregate, the right to purchase the
same number of Warrant Shares and cash, securities or other property, if any,
which may be purchased by the Holder upon exercise of this Warrant at the time
of its surrender.

               (b) In the event of any transfer of all or any portion of this
Warrant in accordance with Section 9.2(a) above, the Company shall issue (i) a
new warrant of like tenor to the transferee, representing the right to purchase
the number of Warrant Shares, and cash, securities or other property, if any,
which were purchasable by the Holder of the transferred portion of this Warrant,
and (ii) a new warrant of like tenor to the Holder, representing the right to
purchase the number of Warrant Shares, and cash, securities or other property,
if any, purchasable by the Holder of the un-transferred portion of this Warrant.
Until this Warrant or any portion thereof is transferred on the books of the
Company, the Company may treat the Holder as the absolute holder of this Warrant
and all right, title and interest therein for all purposes, notwithstanding any
notice to the contrary.

                                       9
<PAGE>

         9.3 No Restrictions on Transfer. Subject to compliance with applicable
securities laws, this Warrant and any portion hereof, the Warrant Shares and the
rights hereunder may be transferred by the Holder in its sole discretion at any
time and to any Person or Persons, including without limitation Affiliates and
affiliated groups of such Holder, without the consent of the Company.

         9.4 Warrant Register. The Company shall keep at its principal office a
register for the registration, and registration of transfers, of the Warrants.
The name and address of each Holder of one or more of the Warrants, each
transfer thereof and the name and address of each transferee of one or more of
the Warrants shall be registered in such register. The Company shall give to any
Holder of a Warrant promptly upon request therefor, a complete and correct copy
of the names and addresses of all registered Holders of the Warrants.

     10. Lost, Stolen or Destroyed Warrant. Upon receipt by the Company of
evidence satisfactory to it of loss, theft, destruction or mutilation of this
Warrant and, in the case of loss, theft or destruction, on delivery of a
customary affidavit of the Holder and indemnity agreement, or, in the case of
mutilation, upon surrender of this Warrant, the Company at its expense will
execute and deliver, or will instruct its transfer agent to execute and deliver,
a new Warrant of like tenor and date, and any such lost, stolen or destroyed
Warrant thereupon shall become void.

     11. General.

         11.1 Authorized Shares, Reservation of Shares for Issuance. At all
times while this Warrant is outstanding, the Company shall maintain its
corporate authority to issue, and shall have authorized and reserved for
issuance upon exercise of this Warrant, such number of shares of Common Stock,
any other capital stock or other securities as shall be sufficient to perform
its obligations under this Warrant (after giving effect to any and all
adjustments to the number and kind of Warrant Shares purchasable upon exercise
of this Warrant).

         11.2 No Impairment. The Company will not, by amendment of its
Certificate of Incorporation or through any reorganization, transfer of assets,
consolidation, merger, dissolution, issuance or sale of securities, sale or
other transfer of any of its assets or properties, or any other voluntary
action, avoid or seek to avoid the observance or performance of any of the terms
of this Warrant, but will at all times in good faith assist in the carrying out
of all such terms and in the taking of all such action as may be necessary or
appropriate in order to protect the rights of the Holder hereunder against
impairment. Without limiting the generality of the foregoing, the Company (a)
will not increase the par value of any shares of Common Stock issuable upon the
exercise of this Warrant above the amount payable therefor on such exercise, and
(b) will take all action that may be necessary or appropriate in order that the
Company may validly and legally issue fully paid and nonassessable shares of
Common Stock upon the exercise of this Warrant.

                                       10
<PAGE>

         11.3 No Rights as Stockholder. The Holder shall not be entitled to vote
or to receive dividends or to be deemed the holder of Common Stock that may at
any time be issuable upon exercise of this Warrant for any purpose whatsoever,
nor shall anything contained herein be construed to confer upon the Holder any
of the rights of a stockholder of the Company or any right to vote for the
election of directors or upon any matter submitted to stockholders at any
meeting thereof, or to give or withhold consent to any corporate action (whether
upon any recapitalization, issuance or reclassification of stock, change of par
value or change of stock to no par value, consolidation, merger or conveyance or
otherwise), or to receive notice of meetings (except to the extent otherwise
provided in this Warrant), or to receive dividends or subscription rights, until
the Holder shall have exercised this Warrant and been issued Warrant Shares in
accordance with the provisions hereof.

         11.4 Notices. All notices, requests, consents and other communications
hereunder shall be in writing and shall be deemed to have been given if
personally delivered or delivered by overnight courier or mailed by first-class
registered or certified mail, postage prepaid, return receipt requested, or sent
by fax machine, addressed as follows:

                                (a) if to the Company at:

                                 Motient Corporation
                                 300 Knightsbridge Parkway
                                 Lincolnshire, IL  60069
                                 Attention:  Chief Accounting Officer
                                 Facsimile:  847-478-4810

                                 with copies to:

                                 Motient Corporation
                                 300 Knightsbridge Parkway
                                 Lincolnshire, IL  60069
                                 Attention:  General Counsel
                                 Facsimile:  847-478-4810

                                 Andrews Kurth LLP
                                 450 Lexington Avenue
                                 New York, NY  10017
                                 Attention:  Paul Silverstein, Esq.
                                 Facsimile:  (212) 850-2929

                                 (b) if to the Holder, at the Holder's address
                                 appearing in the books maintained by the
                                 Company.

                                       11
<PAGE>

     12. Amendment and Waiver. No failure or delay of the Holder in exercising
any power or right hereunder shall operate as a waiver thereof, nor shall any
single or partial exercise of any such right or power, or any abandonment or
discontinuance of steps to enforce such a right or power, preclude any other or
further exercise thereof or the exercise of any other right or power. The rights
and remedies of the Holder are cumulative and not exclusive of any rights or
remedies which it would otherwise have. The terms of this Warrant may be
amended, modified or waived only with the written consent of the Company and the
Holder.

     13. Governing Law. This Warrant shall be governed by and construed in
accordance with the laws of the State of Delaware, as such laws are applied to
contracts entered into and wholly to be performed within the State of Delaware
and without giving effect to any principles of conflicts or choice of law that
would result in the application of the laws of any other jurisdiction.

     14. Covenants To Bind Successor and Assigns. All covenants, stipulations,
promises and agreements in this Warrant contained by or on behalf of the Company
shall bind its successors and assigns, whether so expressed or not.

     15. Severability. In case any one or more of the provisions contained in
this Warrant shall be invalid, illegal or unenforceable in any respect, the
validity, legality and enforceability of the remaining provisions contained
herein shall not in any way be affected or impaired thereby. The parties shall
endeavor in good faith negotiations to replace the invalid, illegal or
unenforceable provisions with valid provisions the economic effect of which
comes as close as possible to that of the invalid, illegal or unenforceable
provisions.

     16. Construction. The definitions of this Warrant shall apply equally to
both the singular and the plural forms of the terms defined. Wherever the
context may require, any pronoun shall include the corresponding masculine,
feminine and neuter forms. The section and paragraph headings used herein are
for convenience of reference only, are not part of this Warrant and are not to
affect the construction of or be taken into consideration in interpreting this
Warrant.

     17. Remedies. The Holder, in addition to being entitled to exercise all
rights granted by law, including recovery of damages, will be entitled to
specific performance of its rights under this Warrant. The Company agrees that
monetary damages would not be adequate compensation for any loss incurred by
reason of a breach by it of the provisions of this Warrant and hereby agrees to
waive the defense in any action for specific performance that a remedy at law
would be adequate. In any action or proceeding brought to enforce any provision
of this Warrant or where any provision hereof is validly asserted as a defense,
the successful party to such action or proceeding shall be entitled to recover
reasonable attorneys' fees in addition to any other available remedy.

                           [SIGNATURE PAGE TO FOLLOW]

                                       12
<PAGE>

         IN WITNESS WHEREOF, the Company has executed this Common Stock Purchase
Warrant as of the date set forth above.

                                    COMPANY:

                                    MOTIENT CORPORATION

                                    By:
                                       ----------------------------------------
                                       Christopher Downie,
                                       Executive Vice President and Chief
                                       Operating Officer

               [SIGNATURE PAGE TO COMMON STOCK PURCHASE WARRANT]

<PAGE>

                                   NOTICE AND
                                  SUBSCRIPTION

To:      MOTIENT CORPORATION                 Date:______________________________
         300 Knightsbridge Parkway
         Lincolnshire, IL  60069

         The undersigned hereby irrevocably elects to exercise the right of
purchase represented by the attached Warrant for, and to exercise thereunder,
__________ shares of Common Stock, of MOTIENT CORPORATION a Delaware
corporation, and tenders herewith payment of $__________, representing the
aggregate purchase price for such shares based on the price per share provided
for in such Warrant. Such payment is being made in accordance with [Section
3(i)] [Section 3(ii)] [Section 3(iii)] [Section 3(iv)] of the attached Warrant.

Please issue a certificate or certificates for such shares of Common Stock in
the following name or names and denominations and deliver such certificate or
certificates to the person or persons listed below at their respective addresses
set forth below:

If said number of shares of Common Stock shall not be all the shares of Common
Stock issuable upon exercise of the attached Warrant, a new Warrant is to be
issued in the name of the undersigned for the balance remaining of such shares
of Common Stock less any fraction of a share of Common Stock paid in cash.

Dated:  ___________, ____                         _____________________________
                                                  Signature

<PAGE>

                               FORM OF ASSIGNMENT

                   (To be executed upon assignment of Warrant)

         For value received, __________________________________ hereby sells,
assigns and transfers unto __________________ the attached Warrant [__% of the
attached Warrant], together with all right, title and interest therein, and does
hereby irrevocably constitute and appoint ____________________ attorney to
transfer said Warrant [said percentage of said Warrant] on the books of MOTIENT
CORPORATION, a Delaware corporation, with full power of substitution in the
premises.

         If not all of the attached Warrant is to be so transferred, a new
Warrant is to be issued in the name of the undersigned for the balance of said
Warrant.

         The undersigned hereby agrees that it will not sell, assign, or
transfer the right, title and interest in and to the Warrant unless applicable
federal and state securities laws have been complied with.

Dated:  _____________, ____         ____________________________________________
                                    Signature

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