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                                                                   EXHIBIT 10.44

                               MOTIENT CORPORATION
                          REGISTRATION RIGHTS AGREEMENT

         This REGISTRATION RIGHTS AGREEMENT (this "AGREEMENT") is made as of
November 12, 2004 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 up to
$131,580,429.13 of shares (the "SHARES") of the Company's common stock, $0.01
par value 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, the "COMMON STOCK"), 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 with
respect to Tudor, in addition to the foregoing, the term "Affiliate" shall also
include the Related Entities, 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 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 Delaware are authorized or required by law or other governmental action
to close.

         "CLOSING DATE" has the meaning set forth in the Securities Purchase
Agreement.

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

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         "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 Shares and the Warrant 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), PROVIDED, HOWEVER, that the term
"Registrable Shares" shall not include any of the 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.

         "RELATED ENTITIES" includes, with respect to Tudor, any entities for
which any of the Tudor Entities or any of its affiliates serve as general
partner and/or investment advisor or in a similar capacity, and all mutual funds
or other pooled investment vehicles or entities under the control or management
of any of the Tudor Entities, or the general partner or investment adviser
thereof, or any affiliate of them. For purposes of this Agreement (a) "Tudor
Entities" means each of the following: any entity for which Tudor Investment
Corporation or an Affiliate thereof acts as general partner and/or investment
adviser, Tudor Investment Corporation or any Affiliate thereof acts as general
partner and/or investment adviser, Tudor Investment Corporation, Tudor Group
Holdings, LLC, their respective Affiliates, or any Affiliate or Affiliated Group
of Tudor Investment Corporation and/or Tudor Group Holdings LLC, and (b) with
respect to the Tudor Entities, "Affiliated Group" has the meaning given to it in
Section 1504 of the Internal Revenue Code of 1986, as amended, and in addition
includes any analogous combined, consolidated or unitary group, as defined under
any applicable state, local or foreign income tax law.

         "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.

         "TUDOR" means, collectively, The Raptor Global Portfolio, Ltd., The
Tudor BVI Global Portfolio, Ltd., The Altar Rock Fund L.P. and Tudor Proprietary
Trading, L.L.C.

         "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, a form of which is attached hereto as Exhibit A.

         "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 sixty (60) 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 one hundred twenty (120) days following the
Closing Date (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).

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                  (b) Notwithstanding anything in this Section 2 to the
contrary, if the Company shall furnish to the Investors a certificate signed by
the President or Chief Executive Officer of the Company stating that 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(c), 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 or Section 3 that such Investor furnish to the
Company such information regarding itself, the Registrable Securities held by
it, and the method of disposition of such securities as shall be required to
effect the registration of such Investor's Registrable Securities.

                  (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
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

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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 2 or Section 3 that such Investor furnish to the
Company such information regarding itself, the Registrable Securities held by
it, and the method of disposition of such securities as shall be required to
effect the registration of such Investor's Registrable Securities.

         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.

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

                  (a) (i) 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) (i) 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 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;

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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).

                  (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.

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                  (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.

                  (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.

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         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
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 loss, claim, damage, liability or action; 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 loss,
damage, liability or action 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.

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                  (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 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 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,

                                       10
<PAGE>

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, claims, damages, liabilities 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,
claims, damages, liabilities 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, claims, damages, liabilities
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
immediately preceding 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 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
Shares or Warrant 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 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.

                                       11
<PAGE>

         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
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.

                                       12
<PAGE>

                  (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.

                  (h) This Agreement shall be binding upon, and inure to the
benefit of, the parties hereto and their permitted successors and assigns.

                            [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

                                PURCHASERS:

                                /S/ JOHN C. WATERFALL
                                ------------------------------------------------
                                Name: John C. Waterfall

                                /S/ EDWIN H. MARGENS
                                ------------------------------------------------
                                Name: Edwin H. Margens

                                /S/ KURT J. RECHNER
                                ------------------------------------------------
                                Name: Kurt J. Rechner Rollover IRA

                                /S/ KURT J. RECHNER           /S/ MELANI RECHNER
                                ------------------------------------------------
                                Name: Kurt Rechner and Melani Rechner

                                /S/ KURT J. RECHNER
                                ------------------------------------------------
                                Name: Kurt J. Rechner 401K Plan and Trust

                                /S/ EDWARD W. ROSE, III
                                ------------------------------------------------
                                Name: Edward W. Rose, III

                                /S/ MORRIS D. WEISS
                                ------------------------------------------------
                                Name: Morris D. Weiss IRA Rollover

                                /S/ MORRIS D. WEISS        /S/ LAUREN C. RAVKIND
                                ------------------------------------------------
                                Name: Morris D. Weiss and Lauren C. Ravkind

                                /S/ GEORGE W. HAYWOOD
                                ------------------------------------------------
                                Name: George W. Haywood

                [SIGNATURE PAGE TO REGISTRATION RIGHTS AGREEMENT]

                                       14
<PAGE>

                                Entity Name:  AHAB PARTNERS, L.P.
                                By:

                                By:        /S/ JONATHAN GALLEN
                                    --------------------------------------------
                                Name:     Jonathan Gallen
                                Title:    General Partner

                                Entity Name:  AHAB INTERNATIONAL, LTD.
                                By:
                                    --------------------------------------------

                                By:       /S/ JONATHAN GALLEN
                                    --------------------------------------------
                                Name:     Jonathan Gallen
                                Title:    Director

                                Entity Name: TRACER CAPITAL PARTNERS L.P.
                                By:
                                    --------------------------------------------

                                By:       /S/ RILEY MCCORMACK
                                    --------------------------------------------
                                Name:     Riley McCormack
                                Title:    Managing Member of the Investment
                                          Manager

                                Entity Name: TRACER CAPITAL PARTNERS QP L.P.
                                By:
                                    --------------------------------------------

                                By:       /S/ RILEY MCCORMACK
                                    --------------------------------------------
                                Name:     Riley McCormack
                                Title:    Managing Member of the Investment
                                          Manager

                                Entity Name: TRACER CAPITAL OFFSHORE FUND LTD.
                                By:
                                    --------------------------------------------

                                By:       /S/ RILEY MCCORMACK
                                    --------------------------------------------
                                Name:     Riley McCormack
                                Title:    Managing Member of the Investment
                                          Manager

                [SIGNATURE PAGE TO REGISTRATION RIGHTS AGREEMENT]

                                       15
<PAGE>

                                Entity Name:  GEORGE KAISER FAMILY
                                              FOUNDATION
                                By:
                                    --------------------------------------------

                                By:       /S/ FREDERIC DORWART
                                    --------------------------------------------
                                Name:     Frederic Dorwart
                                Title:    President and Trustee

                                Entity Name: CARDINAL PARTNERS 2000, L.P.
                                By:
                                    --------------------------------------------

                                By:       /S/ DEBBIE CRADY
                                    --------------------------------------------
                                Name:     Debbie Crady
                                Title:    Vice President of G.P., Cardinal
                                          Investment Company, Inc.

                                Entity Name:       CARDINAL PARTNERS, L.P.
                                By:
                                    --------------------------------------------

                                By:       /S/ DEBBIE CRADY
                                    --------------------------------------------
                                Name:     Debbie Crady
                                Title:    Vice President of G.P., Cardinal
                                          Investment Company, Inc.

                                Entity Name: CLEARVIEW CAPITAL PARTNERS,
                                L.P.
                                By:       CLEARVIEW CAPITAL MANAGEMENT, LLC
                                          AS INVESTMENT ADVISOR

                                By:       /S/ RICHARD BARRARA
                                    --------------------------------------------
                                Name:     Richard Barrara
                                Title:    Managing Director

                [SIGNATURE PAGE TO REGISTRATION RIGHTS AGREEMENT]

                                       16
<PAGE>

                                Entity Name: CLEARVIEW INSTITUTIONAL PARTNERS,
                                             L.P.
                                By:       CLEARVIEW CAPITAL MANAGEMENT, LLC
                                          AS INVESTMENT ADVISOR

                                By:       /S/ RICHARD BARRARA
                                    --------------------------------------------
                                Name:     Richard Barrara
                                Title:    Managing Director

                                Entity Name: CLEARVIEW CAPITAL MASTER FUND, LTD.
                                By:       CLEARVIEW CAPITAL MANAGEMENT, LLC
                                          AS INVESTMENT ADVISOR

                                By:       /S/ RICHARD BARRARA
                                    --------------------------------------------
                                Name:     Richard Barrara
                                Title:    Managing Director

                                Entity Name: GCM LITTLE ARBOR MASTER FUND, LTD.
                                By:       CLEARVIEW CAPITAL MANAGEMENT, LLC
                                          AS INVESTMENT ADVISOR

                                By:       /S/ RICHARD BARRARA
                                    --------------------------------------------
                                Name:     Richard Barrara
                                Title:    Managing Director

                                Entity Name: MWV EMPLOYEE RETIREMENT
                                             PLAN GROUP TRUST
                                By:
                                    --------------------------------------------

                                By:       /S/ JOHN RAPHAEL
                                    --------------------------------------------
                                Name:     John Raphael
                                Title:    Trustee

                [SIGNATURE PAGE TO REGISTRATION RIGHTS AGREEMENT]

                                       17
<PAGE>

                                Entity Name:  XERION PARTNERS II MASTER
                                              FUND LIMITED
                                By:
                                    --------------------------------------------

                                By:       /S/ DANIEL J. ARBESS
                                    --------------------------------------------
                                Name:     Daniel J. Arbess
                                Title:

                                Entity Name:  OZ MASTER FUND, LTD.
                                By:       OZ MANAGEMENT, L.L.C.
                                          AS INVESTMENT ADVISOR

                                By:       /S/ DAN S. OCH
                                    --------------------------------------------
                                Name:     Dan S. Och
                                Title:    Senior Managing Member

                                Entity Name:  OZ MAC 13 LTD.
                                By:       OZ MANAGEMENT, L.L.C.
                                          AS INVESTMENT ADVISOR

                                By:       /S/ DAN S. OCH
                                    --------------------------------------------
                                Name:     Dan S. Och
                                Title:    Senior Managing Member

                                Entity Name:  FLEET MARITIME, INC.
                                By:       OZ MANAGEMENT, L.L.C.
                                          AS INVESTMENT ADVISOR

                                By:       /S/ DAN S. OCH
                                    --------------------------------------------
                                Name:     Dan S. Och
                                Title:    Senior Managing Member

                                Entity Name:  ORE HILL HUB FUND LTD.
                                By:
                                    --------------------------------------------

                                By:       /S/ FREDERICK WAHL
                                    --------------------------------------------
                                Name:     Frederick Wahl
                                Title:    Managing Partner

                [SIGNATURE PAGE TO REGISTRATION RIGHTS AGREEMENT]

                                       18
<PAGE>

                                Entity Name: HIGHLAND EQUITY FOCUS FUND, L.P.
                                By:       HIGHLAND CAPITAL MANAGEMENT, L.P.
                                          ITS GENERAL PARTNER

                                By:       /S/ JAMES DONDERO
                                    --------------------------------------------
                                Name:     James Dondero
                                Title:    President

                                Entity Name: HIGHLAND CRUSADER OFFSHORE
                                             PARTNERS, L.P.
                                By:       HIGHLAND CAPITAL MANAGEMENT, L.P.
                                          ITS GENERAL PARTNER

                                By:       /S/ JAMES DONDERO
                                    --------------------------------------------
                                Name:     James Dondero
                                Title:    President

                                Entity Name:  HIGHLAND EQUITY FUND, L.P.
                                By:       HIGHLAND CAPITAL MANAGEMENT, L.P.
                                          ITS GENERAL PARTNER

                                By:       /S/ JAMES DONDERO
                                    --------------------------------------------
                                Name:     James Dondero
                                Title:    President

                                Entity Name: GREYWOLF CAPITAL PARTNERS II L.P.
                                By:
                                    --------------------------------------------

                                By:       /S/ WILLIAM TROY
                                    --------------------------------------------
                                Name:     William Troy
                                Title:    COO

                [SIGNATURE PAGE TO REGISTRATION RIGHTS AGREEMENT]

                                       19
<PAGE>

                                Entity Name: GREYWOLF CAPITAL OVERSEAS
                                             FUND
                                By:
                                    --------------------------------------------

                                By:       /S/ WILLIAM TROY
                                    --------------------------------------------
                                Name:     William Troy
                                Title:    COO

                                Entity Name: YORK CAPITAL MANAGEMENT, L.P.
                                By:
                                    --------------------------------------------

                                By:       /S/ ADAM J. SEMLER
                                    --------------------------------------------
                                Name:     Adam J. Semler
                                Title:    CFO of its General Partner

                                Entity Name: YORK SELECT, L.P.
                                By:
                                    --------------------------------------------

                                By:       /S/ ADAM J. SEMLER
                                    --------------------------------------------
                                Name:     Adam J. Semler
                                Title:    CFO of its General Partner

                                Entity Name: YORK INVESTMENT LIMITED
                                By:
                                    --------------------------------------------

                                By:       /S/ ADAM J. SEMLER
                                    --------------------------------------------
                                Name:     Adam J. Semler
                                Title:    CFO of its Investment Manager

                                Entity Name: YORK SELECT UNIT TRUST
                                By:
                                    --------------------------------------------

                                By:       /S/ ADAM J. SEMLER
                                    --------------------------------------------
                                Name:     Adam J. Semler
                                Title:    CFO of its Investment Manager

                [SIGNATURE PAGE TO REGISTRATION RIGHTS AGREEMENT]

                                       20
<PAGE>

                                Entity Name: YORK CREDIT OPPORTUNITIES
                                             FUND, L.P.
                                By:
                                    --------------------------------------------

                                By:       /S/ ADAM J. SEMLER
                                    --------------------------------------------
                                Name:     Adam J. Semler
                                Title:    CFO of its General Partner

                                Entity Name: YORK GLOBAL VALUE PARTNERS,
                                             L.P.
                                By:
                                    --------------------------------------------

                                By:       /S/ ADAM J. SEMLER
                                Name:     Adam J. Semler
                                    --------------------------------------------
                                Title:    CFO of its General Partner

                                Entity Name: YORK/GREEN CAPITAL
                                             PARTNERS, L.P.
                                By:
                                    --------------------------------------------

                                By:       /S/ ADAM J. SEMLER
                                    --------------------------------------------
                                Name:     Adam J. Semler
                                Title:    CFO of its General Partner

                                Entity Name: ROCKBAY CAPITAL
                                             INSTITUTIONAL FUND, LLC
                                By:
                                    --------------------------------------------

                                By:       /S/ ATUL KHANNA
                                    --------------------------------------------
                                Name:     Atul Khanna
                                Title:    Investment Manager

                                Entity Name: ROCKBAY CAPITAL
                                             OFFSHORE FUND, LTD.
                                By:
                                    --------------------------------------------

                                By:       /S/ ATUL KHANNA
                                    --------------------------------------------
                                Name:     Atul Khanna
                                Title:    Investment Manager

                [SIGNATURE PAGE TO REGISTRATION RIGHTS AGREEMENT]

                                       21
<PAGE>

                                Entity Name: ROCKBAY CAPITAL FUND, LLC
                                By:
                                    --------------------------------------------

                                By:       /S/ ATUL KHANNA
                                    --------------------------------------------
                                Name:     Atul Khanna
                                Title:    Investment Manager

                                Entity Name: THE RAPTOR GLOBAL
                                             PORTFOLIO LTD.
                                By:       TUDOR INVESTMENT CORPORATION
                                          AS INVESTMENT ADVISOR

                                By:       /S/ WILLIAM T. FLAHERTY
                                    --------------------------------------------
                                Name:     William T. Flaherty
                                Title:    Managing Director

                                Entity Name: TUDOR PROPRIETARY TRADING, L.L.C
                                By:
                                    --------------------------------------------

                                By:       /S/ WILLIAM T. FLAHERTY
                                    --------------------------------------------
                                Name:     William T. Flaherty
                                Title:    Managing Director

                                Entity Name: THE ALTAR ROCK FUND, L.P.
                                By:       TUDOR INVESTMENT CORPORATION
                                          ITS GENERAL PARTNER

                                By:       /S/ WILLIAM T. FLAHERTY
                                    --------------------------------------------
                                Name:     William T. Flaherty
                                Title:    Managing Director

                                Entity Name: THE TUDOR BVI GLOBAL
                                             PORTFOLIO LTD.
                                By:       TUDOR INVESTMENT CORPORATION
                                          AS TRADING ADVISOR

                                By:       /S/ WILLIAM T. FLAHERTY
                                    --------------------------------------------
                                Name:     William T. Flaherty
                                Title:    Managing Director

                [SIGNATURE PAGE TO REGISTRATION RIGHTS AGREEMENT]

                                       22
<PAGE>

                                Entity Name: THE CATALYST CREDIT
                                             OPPORTUNITY FUND OFFSHORE,
                                             LTD.
                                By:       CATALYST INVESTMENT MANAGEMENT, LLC
                                          ITS MANAGING MEMBER

                                By:       /S/ PETER DRIPPE
                                    --------------------------------------------
                                Name:     Peter Drippe
                                Title:    Principal

                                Entity Name: THE CATALYST CREDIT
                                              OPPORTUNITY FUND, L.P.
                                By:       CATALYST INVESTMENT MANAGEMENT, LLC
                                          ITS MANAGING MEMBER

                                By:       /S/ PETER DRIPPE
                                    --------------------------------------------
                                Name:     Peter Drippe
                                Title:    Principal

                                Entity Name: DCM LIMITED
                                By:       CATALYST INVESTMENT MANAGEMENT, LLC
                                          ITS MANAGING MEMBER

                                By:       /S/ PETER DRIPPE
                                    --------------------------------------------
                                Name:     Peter Drippe
                                Title:    Principal

                                Entity Name: LC CAPITAL MASTER FUND, LTD.
                                By:
                                    --------------------------------------------

                                By:       /S/ RICHARD F. CONWAY
                                    --------------------------------------------
                                Name:     Richard F. Conway
                                Title:    Director

                                Entity Name: MILLENNIUM PARTNERS, L.P.
                                By:       MILLENNIUM MANAGEMENT, L.L.C.

                                By:       /S/ TERRY FEENEY
                                    --------------------------------------------
                                Name:     Terry Feeney
                                Title:    Chief Operating Officer

                [SIGNATURE PAGE TO REGISTRATION RIGHTS AGREEMENT]

                                       23
<PAGE>

                                Entity Name: LEHMAN BROTHERS FOR THE
                                             BENEFIT OF GEORGE W. HAYWOOD IRA
                                By:       831-38337-14

                                By:       /S/ MARJORIE HURD
                                    --------------------------------------------
                                Name:     Marjorie Hurd
                                Title:    Retirement Planning Specialist

                                Entity Name: GEORGE HAYWOOD IRA ROLLOVER
                                By:
                                    --------------------------------------------

                                By:       /S/ GEORGE W. HAYWOOD
                                    --------------------------------------------
                                Name:     George W. Haywood
                                Title:

                                Entity Name: CY OFFSHORE FUND, LTD.
                                By:
                                    --------------------------------------------

                                By:       /S/ JAMES W. TRAWEEK, JR.
                                    --------------------------------------------
                                Name:     James W. Traweek, Jr.
                                Title:    Director

                                Entity Name: CS OFFSHORE FUND, LTD.
                                By:
                                    --------------------------------------------

                                By:       /S/ JAMES W. TRAWEEK, JR.
                                    --------------------------------------------
                                Name:     James W. Traweek, Jr.
                                Title:    Director

                                Entity Name: SINGER CHILDREN'S
                                             MANAGEMENT TRUST
                                By:
                                    --------------------------------------------

                                By:       /S/ KAREN SINGER
                                    --------------------------------------------
                                Name:     Karen Singer
                                Title:    Trustee

                [SIGNATURE PAGE TO REGISTRATION RIGHTS AGREEMENT]

                                       24
<PAGE>

                                Entity Name: LOEB PARTNERS CORP.
                                By:
                                    --------------------------------------------

                                By:       /S/ ROBERT GRUBIN
                                    --------------------------------------------
                                Name:     Robert Grubin
                                Title:    Vice President

                                Entity Name: RNR II, LP
                                By:
                                    --------------------------------------------

                                By:       /S/ RICHARD M. ENG
                                    --------------------------------------------
                                Name:     Richrd M. Eng
                                Title:    CFO

                                Entity Name: TEJAS SECURITIES GROUP, INC.
                                             401K PLAN AND TRUST
                                By:        FBO JOHN J. GORMAN, JOHN GORMAN TTEE

                                By:       /S/ JOHN J. GORMAN
                                    --------------------------------------------
                                Name:     John J. Gorman
                                Title:    Trustee

                                Entity Name:  STROME HEDGECAP LIMITED
                                By:       JEFFREY S. LAMBERT

                                By:       /S/ JEFFREY S. LAMBERT
                                    --------------------------------------------
                                Name:     Jeffrey S. Lambert
                                Title:    Director

                [SIGNATURE PAGE TO REGISTRATION RIGHTS AGREEMENT]

                                       25
<PAGE>

                                                                       EXHIBIT A
                                                                       ---------

All correspondence to the Company shall be addressed as follows:

                              Motient Corporation
                           300 Knightsbridge Parkway
                             Lincolnshire, IL 60069
                         Attention: Christopher Downie,
              Executive Vice President and Chief Operating Officer
                          Telecopier: (847) 478-4810,
                           Chris.Downie@Motient.com.

                                with copies to:

                              Motient Corporation
                           300 Knightsbridge Parkway
                             Lincolnshire, IL 60069
                         Attention: Robert Macklin, Esq.
                           Telecopier: (847) 478-4810
                           Robert.Macklin@Motient.com

                                Andrews Kurth LLP
                              450 Lexington Avenue
                               New York, NY 10017
                        Attention: Paul Silverstein, Esq.
                           Telecopier: (212) 850-2929
                          psilverstein@andrewskurth.com

All correspondence to the Investors shall be addressed as set forth in Schedule
1 below.<PAGE>

                                                                   EXHIBIT 10.45

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.

                                                               November 12, 2004

                               MOTIENT CORPORATION

                      FORM OF COMMON STOCK PURCHASE WARRANT

Void after November 12, 2009

         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.

         "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).

<PAGE>

         "COMPANY" means Motient Corporation, a Delaware corporation.

         "EXERCISE PRICE" means, $8.57 per share of Common Stock, as applicable
and as adjusted from time to time pursuant to the terms of this Warrant.

         "EXPIRATION DATE" means November 12, 2009.

         "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.

         "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.

         "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.

         "SEC" means the Securities and Exchange Commission
          ---

         "SHARES" means the shares of Common Stock issued pursuant to the
Securities Purchase Agreement.

         "SECURITIES PURCHASE AGREEMENT" means that certain Securities Purchase
Agreement dated November 12, 2004, by and between the Company and the other
parties thereto.

         "VESTING DATE" has the meaning set forth in Section 2.1 hereof.

         "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
<PAGE>

         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.

         This Warrant shall become exercisable with respect to Warrant Shares
("vest") as follows: (i) with respect to 25% of the Warrant Shares, on January
11, 2005 (the "VESTING DATE"), if a registration statement covering the resale
of the Shares shall not have been filed with the SEC by such date, (ii) with
respect to an additional 25% of the Warrant Shares, on the date that is sixty
(60) days after the Vesting Date, if a registration statement covering the
resale of the Shares shall not have been declared effective by the SEC by such
date, (iii) with respect to an additional 25% of the Warrant Shares, on the date
that is ninety (90) days after the Vesting Date, if a registration statement
covering the resale of the Shares shall not have been declared effective by the
SEC by such date and (iv) with respect to the remaining 25% of the Warrant
Shares, on the date that is one hundred twenty (120) days after the Vesting
Date, if a registration statement covering the resale of the Shares shall not
have been declared effective by the SEC by such date; PROVIDED, HOWEVER, that
notwithstanding the foregoing, the Warrant Shares shall vest in accordance with
clauses (i)-(iv) above 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 clauses (i)-(iv) above but for the Ownership
Limit and second, otherwise in accordance with clauses (i)-(iv) above, 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.

                                       3
<PAGE>

                  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 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
<PAGE>

         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
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.
Notwithstanding the foregoing, no adjustment shall be made with respect to any
dividend of stock purchase rights declared in connection with the issuance of up
to $50,000,000 of shares of Common Stock at a per share price not less than the
Exercise Price pursuant to a follow on rights offering to the Company's existing
stockholders, as contemplated by the Securities Purchase Agreement.

                  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 Sections 4.1 and
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.

                                       5
<PAGE>

                  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 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.

                  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.

                                       6
<PAGE>

         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 any class of securities 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 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 By-Laws 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, and of any shares of Common Stock into which such Warrant
Shares may be converted, shall bear the following legend:

                                       7
<PAGE>

         "THE SHARES REPRESENTED BY THIS CERTIFICATE HAVE NOT BEEN REGISTERED
         UNDER THE SECURITIES ACT OF 1933, AS AMENDED, AND MAY NOT BE OFFERED OR
         SOLD IN THE ABSENCE OF AN EFFECTIVE REGISTRATION STATEMENT UNDER SAID
         ACT OR PURSUANT TO AN AVAILABLE EXEMPTION FROM, or in a transaction not
         subject to, REGISTRATION UNDER SAID ACT."

                  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.

                  9.3 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.

                                       8
<PAGE>

         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 receivable 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.

                  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.

                                       9
<PAGE>

                  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 Financial Officer
                                    Telecopier:  847-478-4810

                           with copies to:

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

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

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

         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.

                                       10
<PAGE>

         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]

                                       11
<PAGE>

         IN WITNESS WHEREOF, the Company has executed this Common Stock Purchase
Warrant as of November 12, 2004.

                                          COMPANY:

                                          MOTIENT CORPORATION

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

                [SIGNATURE PAGE TO COMMON STOCK PURCHASE WARRANT]

                                       12
<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

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00074-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00074-of-00352.parquet"}]]