Document:

Exhibit 10.55

                                VOTING AGREEMENT

         This VOTING AGREEMENT (this "Voting Agreement"), dated as of November
12, 2004, is entered into by and among those stockholders of Mobile Satellite
Ventures GP Inc., a Delaware corporation ("General Partner") and General Partner
of Mobile Satellite Ventures LP, a Delaware limited partnership ("MSV LP"),
listed on Schedule I hereto (each individually, a "Stockholder," and
collectively, the "Stockholders")).

                                    RECITALS

         WHEREAS, each Stockholder owns shares of common stock, par value $0.01
per share, of General Partner (the "Shares"), as well as units of limited
partnership interest of MSV LP;

         WHEREAS, MSV LP and General Partner have entered into purchase
agreements (the "Purchase Agreements") with Motient Ventures Holding
Inc.("Motient") and certain other purchasers (collectively, the "Purchasers"),
pursuant to which the Purchasers will make an equity investment in MSV LP and
General Partner (the "Equity Investments");

         WHEREAS, in connection with the Equity Investments, General Partner,
the Stockholders, and Motient are entering into that certain Amended and
Restated Stockholders' Agreement, dated as of November 12, 2004 (the "GP
Stockholders' Agreement");

         WHEREAS, in connection with the Equity Investments and the concurrent
execution of the GP Stockholders' Agreement, the Stockholders wish to enter into
this Voting Agreement to memorialize their understandings and agreements
regarding the manner in which the Stockholders will vote with respect to certain
matters.

         NOW, THEREFORE, in consideration of the agreements contained herein and
for other good and valuable consideration, the receipt and sufficiency of which
is hereby acknowledged, the parties to this Voting Agreement hereby agree as
follows:

Article I         Defined Terms

         Section 1.01. Definitions. The terms defined in this Article I shall,
for the purposes of this Voting Agreement, have the meanings herein specified.
In addition, any capitalized terms used in this Voting Agreement but not defined
herein shall have the meanings given such term in the GP Stockholders'
Agreement.

         "Affiliate" means any person or entity that directly or indirectly
controls, is controlled by, or is under common control with, the specified
person or entity. As used in this definition, the term "control" means the
possession, directly or indirectly, of the power to direct or cause the
direction of the management and policies of an entity, whether through ownership
of voting securities, by contract or otherwise.

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         "Board" means General Partner's Board of Directors.

         "Columbia Group" means the entities listed under the caption "Columbia
Group" in Schedule I, as well as any subsequent owner of Shares or Units owned
by the Columbia Group as of the date of this Agreement, where such Shares or
Units are transferred to such subsequent owner in accordance with the terms of
Section 2.03 of this Agreement.

         "Equity Investments" has the meaning given to such term in the
Recitals.

         "General Partner" has the meaning given to such term in the Preamble.

         "GP Stockholders' Agreement" has the meaning given to such term in the
Recitals.

         "Investor Group" means each of the following: (i) the TMI Group; (ii)
the MSV Investors Group; (iii) the Telcom/Columbia/Spectrum Group, and (iv) the
Motient Group.

         "Major Transaction" means (a) the merger or consolidation of MSV LP or
General Partner into or with another corporation in which the limited partners
of MSV LP or the stockholders of General Partner, as applicable, and the
Affiliates of such limited partners or stockholders immediately preceding such
merger or consolidation (solely by virtue of their units, shares or other equity
interests of MSV LP or General Partner, as applicable) shall own less than 51%
of the outstanding voting securities of the surviving corporation; (b) the sale,
transfer or lease (but not including a transfer or lease by pledge or mortgage
to a bona fide lender for so long as such lender has no right to accelerate the
maturity of the indebtedness to which such pledge or mortgage relates), whether
in a single transaction or pursuant to a series of related transactions or plan,
of all or substantially all the assets of MSV LP or General Partner, which
assets shall include for these purposes 50% or more of the outstanding voting
capital stock of any subsidiaries of MSV LP or General Partner, as applicable,
the assets of which constitute all or substantially all the assets of MSV LP or
General Partner and its subsidiaries taken as a whole; (c) the sale, transfer or
lease (but not including a transfer or lease by pledge or mortgage to a bona
fide lender for so long as such lender has no right to accelerate the maturity
of the indebtedness to which such pledge or mortgage relates), whether in a
single transaction or pursuant to a series of related transactions, of all or
substantially all the assets of subsidiaries of MSV LP or General Partner, the
assets of which constitute all or substantially all of the assets of MSV LP or
General Partner, as applicable, and its subsidiaries taken as a whole; or (d)
the liquidation, dissolution or winding up MSV LP or General Partner or of such
of MSV LP's or General Partner's subsidiaries, as applicable, the assets of
which constitute all or substantially all of the assets of the business of MSV
LP or General Partner, as applicable, and its subsidiaries taken as a whole,
whether voluntarily or involuntarily.

         "Motient" has the meaning given to such term in the Recitals.

         "Motient Group" means Motient and any other Affiliate of Motient that
owns Shares or Units, as well as any subsequent owner of Shares or Units owned
by the Motient Group as of the date of this Agreement.

         "MSV Investors Group" means the entities listed under the caption "MSV
Investors Group" in Schedule I, as well as any subsequent owner of Shares or
Units owned by the MSV Investors Group as of the date of this Agreement, where
such Shares or Units are transferred to such subsequent owner in accordance with
the terms of Section 2.03 of this Agreement.

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<PAGE>

         "MSV LP" has the meaning given to such term in the Preamble.

         "Parent Transfer/Drag Along Agreement" means that certain Amended and
Restated Parent Transfer/Drag Along Agreement, dated as of August 21, 2003, by
and among MSV LP, General Partner, Motient Corporation, Motient Ventures Holding
Inc., TMI Communications and Company, Limited Partnership, TMI Communications
Delaware, Limited Partnership, and the Investor Parents (as defined therein), as
amended.

         "Partnership Agreement" means that certain Amended and Restated Limited
Partnership Agreement of MSV LP, dated as of November 12, 2004, as amended from
time to time, by and among General Partner and the limited partners named
therein.

         "Purchase Agreements" has the meaning given to such term in the
Recitals.

         Purchasers" has the meaning given to such term in the Recitals.

         "Shares" has the meaning given to such term in the Recitals.

         "Spectrum Group" means the entities listed under the caption "Spectrum
Group" in Schedule I, as well as any subsequent owner of Shares or Units owned
by the Spectrum Group as of the date of this Agreement, where such Shares or
Units are transferred to such subsequent owner in accordance with the terms of
Section 2.03 of this Agreement.

         "Telcom Group" means the entities listed under the caption "Telcom
Group" in Schedule I, as well as any subsequent owner of Shares or Units owned
by the Telcom Group as of the date of this Agreement, where such Shares or Units
are transferred to such subsequent owner in accordance with the terms of Section
2.03 of this Agreement.

         "Telcom/Columbia/Spectrum Group" means, collectively, the Telcom Group,
the Columbia Group, and the Spectrum Group.

         "TMI Group" means the entities listed under the caption "TMI Group" in
Schedule I, as well as any subsequent owner of Shares or Units owned by the TMI
Group as of the date of this Agreement, where such Shares or Units are
transferred to such subsequent owner in accordance with the terms of Section
2.03 of this Agreement.

         "Unit" means a unit of limited partnership interest in MSV LP with the
rights and privileges specified in the Partnership Agreement.

Article II        Voting Agreements

         Section 2.01. Voting of Shares and Units. To the extent the
Stockholders are entitled or required to vote their Shares or Units with respect
to any of the following actions (whether pursuant to law or agreement or
otherwise), none of the Stockholders shall vote its Shares or Units, or execute
a written consent with respect to such Shares or Units, in favor of any of the
following actions, unless at least three of the four Investor Groups are in
favor of such action:

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<PAGE>

         (a) Major Transactions. The consummation by General Partner or MSV LP,
directly or indirectly, of any Major Transaction, or the entry by MSV LP or
General Partner into a binding agreement with respect to a Major Transaction;

         (b) Material Changes to Organizational Documents. The amendment,
alteration, waiver or termination of any provision of (i) the certificate of
incorporation of General Partner, (ii) the bylaws of General Partner, (iii) the
Certificate of Limited Partnership of MSV LP, (iv) the Partnership Agreement,
(v) the GP Stockholders' Agreement, or (v) the Parent Transfer/Drag Along
Agreement, in each case in any manner that materially affects the rights,
privileges or obligations of the stockholders of General Partner or the limited
partners of MSV LP;

         (c) Acquisition of More than 49% of Shares or Units. The acquisition,
in any transaction or series of related transactions, by any stockholder of
General Partner or limited partner of MSV LP (including any Affiliates of such
stockholders or limited partners) of direct or indirect ownership of more than
49% of (i) the outstanding Shares or (ii) the outstanding Units (including in
each case any Shares or Units attributable to unexercised options or warrants or
other similar securities owned by such stockholder or limited partner or their
Affiliates); or

         (d) Exercise of Drag Along Rights. Any exercise of the "drag along"
rights set forth in Section 8.5(b) of the GP Stockholders' Agreement, including,
for the avoidance of doubt, any delivery of a Drag-Along Notice (as defined in
Section 8.5(b) of the GP Stockholders' Agreement).

         Section 2.02. Board Votes. For so long as any Stockholder or Investor
Group is entitled to designate one or more directors on the Board, each
Stockholder agrees to cause its (or its Investor Group's) designees on the Board
to cast their votes as directors with respect to any of the matters described in
Section 2.01 above in a manner consistent with the agreements set forth in
Section 2.01 above; provided, that nothing in this Voting Agreement shall be
deemed to require a director to take any action, or refrain from acting, in a
manner inconsistent with such director's fiduciary duties under Delaware law.

         Section 2.03. Purchasers and Transferees Bound. In addition to any
other requirements of the Partnership Agreement or the GP Stockholders'
Agreement relating to a transfer of Units or Shares, no Units or Shares shall be
sold, assigned, transferred or otherwise disposed of by any of the Stockholders
unless the purchaser or transferee of such Units or Shares executes a written
agreement or instrument accepting, with respect to the Units or Shares acquired
by such purchaser or transferee, all of the terms and conditions set forth in
this Voting Agreement and agreeing to be bound thereby. Following any such
transfer of Shares or Units, such Shares or Units shall remain subject to the
provisions of this Voting Agreement, and the purchaser or transferee of such
Shares or Units shall be deemed, for all purposes of this Voting Agreement, to
be a member of the same Investor Group as the Stockholder from which such Shares
or Units were acquired.

Section 2.04.     Rules of Construction.

         (a) Telcom/Columbia/Spectrum Group. Concurrent with the execution of
this Voting Agreement, the Telcom/Columbia/Spectrum Group shall deliver a
written instrument, signed by each Stockholder that is a member of such Group,

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<PAGE>

to the other Stockholders, stating the method by which the
Telcom/Columbia/Spectrum Group will express its binding vote to the other
Stockholders for matters to be voted on pursuant to this Voting Agreement. Such
methodology shall be selected by the members of the Telcom/Columbia/Spectrum
Group in their discretion, but the methodology indicated in such written
instrument shall be binding on such Stockholders unless and until a subsequent
written instrument is delivered, signed by each Stockholder that is a member of
the Telcom/Columbia/Spectrum Group, changing such methodology.

         (b) Shares and Units Transferred to Other Parties. For the avoidance of
doubt, in the case of any votes or consents required by this Voting Agreement,
Shares or Units that are sold or transferred by Stockholders who are members of
one of the Investor Groups shall continue to be counted as Shares or Units, as
the case may be, owned by members of such selling Stockholder's Investor Group.
In addition, after the date of this Agreement, if any Stockholders sell or
transfer less than all of the Shares or Units owned by such Stockholder's
Investor Group to one or more persons not already members of such Stockholder's
Investor Group, then, no later than the effective date of such sale or transfer,
the Stockholder shall deliver a written instrument signed by both the transferor
and transferee(s) to each other Stockholder, stating the method by which such
transferring Stockholder's Investor Group will express its binding vote to the
other Stockholders for matters to be voted on pursuant to this Voting Agreement.

Article III       Miscellaneous

         Section 3.01. Term. This Voting Agreement, and the obligations of the
parties hereunder, shall survive and remain in effect until November 12, 2007,
or such other date as shall be agreed by two of the three Investor Groups party
to this Agreement (including, for this purpose, any of such Investor Group's
permitted transferees or assignees).

         Section 3.02. Amendments. This Voting Agreement may be amended or
modified, and the rights and obligations of the parties to this Agreement may be
waived, only upon the written consent of two of the three Investor Groups party
to this Agreement (including, for this purpose, any of such Investor Group's
permitted transferees or assignees).

         Section 3.03. Governing Law. This Agreement shall be governed in all
respects by the law of the State of New York as such law is applied to
agreements between New York residents entered into and performed entirely in the
State of New York, without regard to the conflict of laws provisions thereof.

         Section 3.04. Successors and Assigns. Without in any way limiting the
applicability of other provisions of this Agreement that may be applicable, the
provisions hereof shall inure to the benefit of, and be binding upon, the
successors, assigns, heirs, executors and administrators of the parties hereto.
Nothing in this Agreement, express or implied, is intended to confer upon any
other party (other than the parties to this Agreement or their respective
successors and assigns) any rights, remedies, obligations or liabilities under
or by reason of this Agreement, except as expressly provided in this Agreement.

         Section 3.05. Severability. In case any provision of this Agreement
shall be invalid, illegal or unenforceable, the validity, legality and
enforceability of the remaining provisions shall not in any way be affected or
impaired thereby; provided, that no such severability shall be effective if it
materially and adversely affects the economic benefit of this Agreement to any
party.

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<PAGE>

         Section 3.06. Notices. All notices required or permitted hereunder
shall be in writing and shall be deemed effectively given (a) upon personal
delivery to the party to be notified, (b) when sent by confirmed facsimile if
sent during normal business hours of the recipient, if not, then on the next
business day, (c) five days after having been sent by registered or certified
mail, return receipt requested, postage prepaid, or (d) one day after deposit
with a nationally recognized overnight courier, specifying next day delivery,
with written verification of receipt. All communications shall be sent to each
Stockholder at the address designated by such party in Schedule I.

         Section 3.07. Equitable Relief. Each Stockholder agrees that if it
fails to perform its obligations under this Agreement for any reason whatsoever,
the other parties hereto shall be entitled to specific performance and
injunctive or other equitable relief, and each Stockholder hereby further agrees
to waive any requirement for the securing or posting of any bond in connection
with the obtaining of any injunctive or other equitable relief. This provision
is without prejudice to any other rights that the other parties to this
Agreement may have against any other party for any failure to perform its
obligations under this Agreement.

         Section 3.08. Further Assurances. Each Stockholder shall at any time
and from time to time promptly execute and deliver to the other Stockholders
such further instruments, consents and other documents and take such further
action as such other Stockholders may reasonably require in order to carry out
the full intent and purpose of this Agreement.

         Section 3.09. Interpretation. The titles of the sections and
subsections of this Agreement are for convenience of reference only and are not
to be considered in construing this Agreement. All pronouns contained herein,
and any variations thereof, shall be deemed to refer to the masculine, feminine
or neutral, singular or plural, as to the identity of the parties hereto may
require.

         Section 3.10. Counterparts. This Agreement may be executed in any
number of counterparts, each of which shall be an original, but all of which
together shall constitute one instrument. Delivery of an executed counterpart of
a signature page of this Agreement by facsimile shall be effective as delivery
of a manually executed counterpart of this Agreement.

         Section 3.11. Entire Agreement. This Agreement, the Schedules hereto
and any other documents delivered pursuant hereto constitute the full and entire
understanding and agreement between the parties with regard to the subjects
hereof and supersede any and all prior and contemporaneous agreements or
understandings, whether expressed or implied, written or oral, between the
parties with respect hereto and thereto. No party shall be liable or bound to
any other in any manner by any representations, warranties, covenants and
agreements except as specifically set forth herein and therein.

                            [Signature Pages Follow]

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<PAGE>

         IN WITNESS WHEREOF, the parties hereto have duly executed this Voting
Agreement as of the date first above written.

                              MSV INVESTORS, LLC

                              By:      /s/ Jeffery A. Leddy
                                       ---------------------------------------
                                       Name: Jeffery A. Leddy
                                       Title: CEO

                              TMI COMMUNICATIONS DELAWARE, LIMITED PARTNERSHIP

                              By:      3924505 Canada, Inc., its General Partner

                              By:      /s/ Rory McCormick
                                       ---------------------------------------
                                       Name: Rory McCormick
                                       Title: President

                              TELCOM SATELLITE VENTURES II, INC.

                              By:      /s/ Rajendra Singh
                                       ---------------------------------------
                                       Name: Rajendra Singh
                                       Title: Chairman and CEO

                              TELCOM SATELLITE VENTURES INC.

                              By:      /s/ Rajendra Singh
                                       ---------------------------------------
                                       Name: Rajendra Singh
                                       Title: Chairman and CEO

<PAGE>

                              SPECTRUM SPACE EQUITY INVESTORS IV-II, INC.

                              By:      /s/ Kevin J. Maroni
                                       ---------------------------------------
                                       Name: Kevin J. Maroni
                                       Title: President

                              SPECTRUM SPACE IV PARALLEL II, INC.

                              By:      /s/ Kevin J. Maroni
                                       -----------------------------------------
                                       Name: Kevin J. Maroni
                                       Title: President

                              SPECTRUM SPACE IV MANAGERS II, INC.

                              By:      /s/ Kevin J. Maroni
                                       -----------------------------------------
                                       Name: Kevin J. Maroni
                                       Title: President

                              SPECTRUM SPACE EQUITY INVESTORS IV, INC.

                              By:      /s/ Kevin J. Maroni
                                       -----------------------------------------
                                       Name: Kevin J. Maroni
                                       Title: President

<PAGE>

                              SPECTRUM SPACE IV PARALLEL, INC.

                              By:      /s/ Kevin J. Maroni
                                       -----------------------------------------
                                       Name: Kevin J. Maroni
                                       Title: President

                              SPECTRUM SPACE IV MANAGERS, INC.

                              By:      /s/ Kevin J. Maroni
                                       -----------------------------------------
                                       Name: Kevin J. Maroni
                                       Title: President

<PAGE>

                              COLUMBIA SPACE (QP) II, INC.

                              By:      /s/ Donald A. Doering
                                       -----------------------------------------
                                       Name: Donald A. Doering
                                       Title: Treasurer

                              COLUMBIA SPACE (AI) II, INC.

                              By:      /s/ Donald A. Doering
                                       -----------------------------------------
                                       Name: Donald A. Doering
                                       Title: Treasurer

                              COLUMBIA SPACE PARTNERS II, INC.

                              By:      /s/ Donald A. Doering
                                       -----------------------------------------
                                       Name: Donald A. Doering
                                       Title: Treasurer

                              COLUMBIA SPACE (QP), INC.

                              By:      /s/ Donald A. Doering
                                       -----------------------------------------
                                       Name: Donald A. Doering
                                       Title: Treasurer

<PAGE>

                              COLUMBIA SPACE (AI), INC.

                              By:      /s/ Donald A. Doering
                                       -----------------------------------------
                                       Name: Donald A. Doering
                                       Title: Treasurer

                              COLUMBIA SPACE PARTNERS, INC.

                              By:      /s/ Donald A. Doering
                                       -----------------------------------------
                                       Name: Donald A. Doering
                                       Title: TreasurerExhibit 10.56

                     AMENDED AND RESTATED CONSENT AGREEMENT

         This Amended and Restated Consent Agreement ("Consent Agreement"),
dated as of February 9, 2005, is entered into by and among those stockholders of
Mobile Satellite Ventures GP Inc., a Delaware corporation ("General Partner")
and General Partner of Mobile Satellite Ventures LP, a Delaware limited
partnership, listed on the signature pages hereto (collectively, the
"Telcom/Columbia/Spectrum Parties").

                                    RECITALS

         WHEREAS, each of the Telcom/Columbia/Spectrum Parties are party to that
certain Voting Agreement by and among the stockholders of General Partner, dated
November 12, 2004, as amended and in effect from time to time (the "Voting
Agreement").

         WHEREAS, each of the Telcom/Columbia/Spectrum Parties are party to that
certain Amended and Restated Stockholders Agreement by and among the
stockholders of General Partner, dated November 12, 2004, as amended and in
effect from time to time (the "Stockholders' Agreement ").

         WHEREAS, each of the Telcom/Columbia/Spectrum Parties are members of
the Telcom/Columbia/Spectrum Group.

         WHEREAS, immediately after execution of this Consent Agreement, Telcom
Satellite Ventures, Inc. and Telcom Satellite Ventures II, Inc. will merge with
and into MVH Holding Inc., a Delaware corporation and wholly owned subsidiary of
Motient Corporation, and immediately thereafter MVH Holding Inc. will contribute
the assets of Telcom Satellite Ventures, Inc. and Telcom Satellite Ventures II,
Inc. to Motient Venture Holdings Inc. ("MVH"), a Delaware corporation and wholly
owned subsidiary of MVH Holding Inc. (the "Telcom/MVH Merger").

         WHEREAS, pursuant to Section 2.04(a) of the Voting Agreement, the
Telcom/Columbia/Spectrum Parties must provide the other Stockholders with a
written instrument signed by the Telcom/Columbia/Spectrum Parties stating the
method by which the Telcom/Columbia/Spectrum Group will express its binding vote
to the other Stockholders in respect of matters that are to be voted on by the
Stockholders pursuant to the Voting Agreement.

         WHEREAS, capitalized terms not otherwise defined herein shall have the
meanings given such terms in the Voting Agreement.

         NOW, THEREFORE, in consideration of the agreements contained herein and
for other good and valuable consideration, the receipt and sufficiency of which
is hereby acknowledged, the Telcom/Columbia/Spectrum Parties hereby agree as
follows:

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<PAGE>

         1. Definitions.

         "Columbia Blocker Corps." shall mean (i) Columbia Space (QP), Inc.,
(ii) Columbia Space (AI), Inc., and (iii) Columbia Space Partners, Inc.

         "Columbia Funds" shall mean (i) Columbia Capital Equity Partners III
(QP), L.P., (ii) Columbia Capital Equity Partners III (AI), L.P., (iii) Columbia
Capital Equity Partners III (Cayman), L.P., (iv) Columbia Capital Investors III,
LLC, (v) Columbia Capital Employee Investors III, LLC and/or (vi) any affiliated
fund of the foregoing.

         "Effective Time" shall mean the effective time of the Telcom/MVH
Merger.

         "Spectrum Blocker Corps." shall mean (i) Spectrum Space Equity
Investors IV, Inc., (ii) Spectrum Space IV Parallel, Inc., and (iii) Spectrum
Space IV Managers, Inc.

         "Spectrum Funds" shall mean (i) Spectrum Equity Investors IV, L.P.,
(ii) Spectrum Equity Investors Parallel IV, L.P., (iii) Spectrum IV Investment
Managers Fund, L.P and/or (iv) any affiliated fund of the foregoing.

         "Telcom Blocker Corps." shall mean (i) Telcom Satellite Ventures Inc.,
and (ii) Telcom Satellite Ventures II Inc. prior to the Effective Time and MVH
after the Effective Time.

         "Telcom/Columbia/Spectrum Shares" shall mean any Shares held by the
Columbia Blocker Corps., Spectrum Blocker Corps. and/or Telcom Blocker Corps
immediately prior to the Effective Time.

         "Telcom/Columbia/Spectrum Units" shall mean any Units held by the
Columbia Blocker Corps., Spectrum Blocker Corps. and/or Telcom Blocker Corps
immediately prior to the Effective Time.

         "Transfer" shall means any transfer, sale, gift, exchange, assignment,
merger, recapitalization, pledge, hypothecation or other disposition of direct
or indirect ownership or voting control of any Telcom/Columbia/Spectrum Shares
and any Telcom/Columbia/Spectrum Units.

         "Transferee" shall mean any holder of Telcom/Columbia/Spectrum Shares
and Telcom/Columbia/Spectrum Units received pursuant to a Transfer.

         2. Consent.

         A. From and after the Effective Time and until such time as the
Columbia Funds no longer own, directly or indirectly, at least 25% of the Shares
and Units owned by the Columbia Blocker Corps. immediately prior to the
Effective Time, the vote or written consent of the Shares or Units owned by the
Columbia Blocker Corps., exclusive of the vote of any Shares or Units owned by
the Spectrum Blocker Corps, and Telecom Blocker Corps. as of the time of such

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<PAGE>

vote or written consent shall bind the Telcom/Columbia/Spectrum Group with
respect to matters to be voted on or consented to pursuant to Sections 2.01,
2.02, 3.01, or 3.02 of the Voting Agreement. Promptly following the execution of
this Consent Agreement, the stockholders of each of the Columbia Blocker Corps.,
the Spectrum Blocker Corps. and the Telcom Blocker Corps. (and MVH as successor
pursuant to the Telcom/MVH Merger), will deliver to the other Stockholders of
General Partner the notice attached hereto as Exhibit A advising the other
Stockholders of General Partner of the parties forgoing agreement with respect
to the voting of the Telcom/Columbia/Spectrum Shares and the Telcom/Columbia
Spectrum Shares and Units. The notice delivered pursuant to this Section 2A
shall remain in effect until such time as the parties are required by Section 2B
to give the notice required thereby.

         B. From and after such time as the Columbia Funds no longer own,
directly or indirectly, at least 25% of the Shares and Units owned by the
Columbia Blocker Corps. immediately prior to the Effective Time, the vote or
written consent of the holders of a majority of the Telcom/Columbia/Spectrum
Shares or Telcom/Columbia/Spectrum Units, as the case may be, as of the time of
such vote or written consent shall bind the Telcom/Columbia/Spectrum Group with
respect to matters to be voted on or consented to pursuant to Sections 2.01,
2.02, 3.01, or 3.02 of the Voting Agreement. Promptly following the effective
time after which the Columbia Funds no longer own, directly or indirectly, at
least 25% of the shares and Units owned by the Columbia Blocker Corps., the
stockholders of each of the Columbia Blocker Corps., the Spectrum Blocker Corps.
and the Telcom Blocker Corps. (or MVH as successor pursuant to the Telcom/MVH
merger) will deliver to the other Stockholders of General Partner the notice
attached hereto as Exhibit B advising the other Stockholders of General Partner
that from and after such date the parties agreement with respect to the voting
of the Telcom/Columbia/Spectrum Units and the Telcom/Columbia Spectrum Shares
and Units.

         C The Telcom/Columbia/Spectrum Group will not vote or execute a written
consent for a waiver of the 49% limitation in Section 8.6 of the Stockholders'
Agreement or Section 2.01(c) of the Voting Agreement with respect to the
acquisition by any stockholder of General Partner or limited partner of MSV
(including any Affiliates (as defined in the MSV LP Agreement (as defined in the
Stockholders' Agreement) of such stockholders or limited partners) other than
MVH of more than 49% of (a) the outstanding Stock (as defined in the
Stockholders' Agreement ) or (b) the outstanding Units (including in each case
any Stock or Units attributable to unexercised options or warrants or other
similar securities owned by such stockholder or limited partner or their
affiliates), unless such limitation is also waived for MVH or otherwise does not
apply to MVH in connection with the same transaction (including application with
regard to rights of first refusal pursuant to the Stockholders Agreement). If
the Telcom/Columbia/Spectrum Group votes to waive the 49% limitation (in
accordance with this Section 2C) with respect to (i) a limited partner of MSV or
stockholder of General Partner other than MVH and (ii) MVH, then MVH (and any
other Affiliate of MVH that owns Shares or Units, as well as any subsequent
owner of Shares or Units owned by the Motient Group (as defined in the Voting
Agreement)) will vote to waive the 49% limitation (in accordance with this
Section 2C) with respect to such other limited partner of MSV or stockholder of
General Partner.

         D. The parties that shall bind the Telcom/Columbia/Spectrum Group with
respect to matters to be voted on or consented to pursuant to Sections 2.01,
2.02, 3.01, or 3.02 of the Voting Agreement shall be referred to herein as the
"Binding Parties".

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<PAGE>

         3. Transfers to Transferees.

         A. Except as set forth in Section 2B or 6B (if applicable), no
Transferee shall have any voting power or consent rights under this Consent
Agreement or the Voting Agreement with respect to any Telcom/Columbia/Spectrum
Shares and Telcom/Columbia/Spectrum Units Transferred to such Transferee.

         B. Prior to or simultaneously with any Transfer, (i) the Transferee(s)
shall execute a written agreement or instrument accepting, with respect to the
Telcom/Columbia/Spectrum Shares and Telcom/Columbia/Spectrum Units so
Transferred, all of the terms, conditions and provisions set forth in this
Consent Agreement and agreeing to be bound thereby and (ii) the transferor(s)
shall deliver a written instrument signed by the transferor(s) and the
Transferee(s) to each other Stockholder, stating that the transferor(s) and the
Transferee(s) agree to be so bound by this Consent Agreement.

         4. Circumvention. The parties intend the provisions of this Consent
Agreement to be construed broadly so as to deprive all Transferees, other than
as set forth in Section 2B or 6B (if applicable), any consenting or voting
rights under or pursuant to the Voting Agreement with respect to
Telcom/Columbia/Spectrum Shares and Telcom/Columbia/Spectrum Units Transferred.
Each party agrees that it will not circumvent the intent of this Consent
Agreement and the provisions hereunder.

         5. Equity Interests in TerreStar Networks Inc. As of the Effective
Time, the Columbia Blocker Corps., Spectrum Blocker Corps., and Telcom Blocker
Corps. hold rights (the "Rights Certificates") to receive shares of common stock
("Common Stock") of TerreStar Networks Inc. ("TerreStar"). As a holder of such
Rights Certificates, the Columbia Blocker Corps., Spectrum Blocker Corps., and
Telcom Blocker Corps. are parties to that certain TerreStar Securityholders'
Agreement dated as of December 20, 2004, the Columbia Blocker Corps., Spectrum
Blocker Corps., and Telcom Blocker Corps. are parties to that certain TerreStar
Voting Agreement dated as of December 20, 2004 (the "TerreStar Voting
Agreement") and the stockholders of the Columbia Blocker Corps., Spectrum
Blocker Corps., and Telcom Blocker Corps. are parties to that certain TerreStar
Parent Transfer/Drag Along Agreement dated as of December 20, 2004. The parties
agree that the Rights Certificates, any shares of Common Stock issued upon
conversion of the Rights Certificates and any other equity securities of
TerreStar held by the Columbia Blocker Corps., Spectrum Blocker Corps., and
Telcom Blocker Corps., shall be subject to the provisions of Section 2, Section
3, and Section 4 of this Agreement (the provisions of which are hereby
incorporated by reference, mutatis, mutandis into this Section 5) as if such
Rights Certificates, Common Stock, or other equity securities in TerreStar, as
applicable, were Shares or Units. In the case of the TerreStar Voting Agreement,
the notices contemplated by Section 2A and 2B, which are attached as Exhibits C
or D, shall be delivered to the Holders (as defined in the TerreStar Voting
Agreement).

                                       4
<PAGE>

         6. Miscellaneous.

         A. Term. This Consent Agreement, and the obligations of the parties
hereunder, shall survive and remain in effect so long as the Voting Agreement
survives and remains in effect.

         B. Amendments. This Consent Agreement, and the rights and obligations
of the parties hereto may be waived (either generally or in a particular
instance, either retroactively or prospectively, and either for a specified
period of time or indefinitely) or amended if and only if such waiver or
amendment is consented to in writing by the Binding Parties; provided, however,
that if any waiver or amendment would materially and adversely affect the rights
of one or more parties in a way that is different from its effect on the other
parties, such waiver or amendment shall not be effective as to any such
adversely affected party unless consented to by such adversely affected party.
Each party to this Consent Agreement shall be bound by any amendment or waiver
effected properly and in accordance with this Section, whether or not such party
has consented to such amendment or waiver.

         C. Governing Law. This Consent Agreement shall be governed in all
respects by the law of the State of New York as such law is applied to
agreements between New York residence entered into and performed entirely in the
State of New York, without regard to the conflict of laws provisions hereof.

         D. Successors and Assigns. The provisions hereof shall be binding upon
the Transferees, successors, assigns, heirs, executors and administrators of the
parties hereto. Except as set forth in Section 2B or 6B (if applicable),
Transferees shall not have any voting power or consent rights under this Consent
Agreement.

         E. Severability. In case any provisions of this Consent Agreement shall
be invalid, illegal or unenforceable, the validity, legality and enforceability
of the remaining provisions shall not in any way be affected or impaired
thereby; provided, that no such severability shall be effective if it materially
and adversely affects the economic benefit of this Consent Agreement to any
party hereto.

         F. Notices. All notices required or permitted hereunder shall be in
writing and shall be deemed effectively given (a) upon personal delivery to the
party to be notified, (b) when sent by confirmed facsimile if sent during normal
business hours of the recipient, if not, then on the next business day, (c) five
days after having been sent by registered or certified mail, return receipt
requested, postage prepaid, or (d) one day after deposit with a nationally
recognized overnight courier, specifying next day delivery, with written
verification of receipt. All communications shall be sent to each party at the
address previously provided by such party.

         G. Equitable Relief. Each party agrees that if it fails to perform its
obligations under this Consent Agreement for any reason whatsoever, the other
parties hereto shall be entitled to specific performance and injunctive or other
equitable relief, and each Stockholder hereby further agrees to waive any
requirement for the securing or posting of any bond in connection with the
obtaining of any injunctive or other equitable relief. This provision is without
prejudice to any other rights that the other parties to this Consent Agreement
may have against any other party for any failure to perform its obligations
under this Consent Agreement.

                                       5
<PAGE>

         H. Further Assurances. Each party shall at any time and from time to
time promptly execute and deliver to the other parties such further instruments,
consents and other documents and take such further action as such other parties
may reasonably require in order to carry out the full intent and purpose of this
Consent Agreement.

         I. Interpretation. The titles of the sections and subsections of this
Consent Agreement are for convenience of reference only and are not to be
considered in construing this Consent Agreement. All pronouns contained herein,
and any variations thereof, shall be deemed to refer to the masculine, feminine
or neutral, singular or plural, as to the identity of the parties hereto may
require.

         J. Counterparts. This Consent Agreement may be executed in any number
of counterparts, each of which shall be an original, but all of which together
shall constitute one instrument. Delivery of an executed counterpart of a
signature page of this Consent Agreement by facsimile shall be effective as
delivery of a manually executed counterpart of this Consent Agreement.

         K. Entire Agreement. This Consent Agreement, the Voting Agreement and
any other documents delivered to all parties pursuant hereto constitute the full
and entire understanding and agreement between the parties with regard to the
subjects hereof and supersede any and all prior and contemporaneous agreements
or understandings, whether expressed or implied, written or oral, between the
parties with respect hereto and thereto. No party shall be liable or bound to
any other in any manner by any representations, warranties, covenants and
agreements except as specifically set forth herein and therein.

                            [Signature Pages Follow]

                                       6
<PAGE>

IN WITNESS WHEREOF, the parties hereto have duly executed this Consent Agreement
as of the date first above written.

                                 TELCOM SATELLITE VENTURES II, INC.

                                 By:      /s/ Rajendra Singh
                                          ---------------------------------
                                          Name:    Rajendra Singh
                                          Title:   President

                                 TELCOM SATELLITE VENTURES INC.

                                 By:      /s/ Rajendra Singh
                                          ---------------------------------
                                          Name:    Rajendra Singh
                                          Title:   President

                                 SPECTRUM SPACE EQUITY INVESTORS IV, INC.

                                 By:      /s/ Kevin J. Maroni
                                          ---------------------------------
                                          Name:    Kevin J. Maroni
                                          Title:   President

                                 SPECTRUM SPACE IV PARALLEL, INC.

                                 By:      /s/ Kevin J. Maroni
                                          ---------------------------------
                                          Name:    Kevin J. Maroni
                                          Title:   President

                                 SPECTRUM SPACE IV MANAGERS, INC.

                                 By:      /s/ Kevin J. Maroni
                                          ---------------------------------
                                          Name:    Kevin J. Maroni
                                          Title:   President

                                       7
<PAGE>

                                 COLUMBIA SPACE (QP), INC.

                                 By:      /s/ Donald A. Doering
                                          ---------------------------------
                                          Name:    Donald A. Doering
                                          Title:   Treasurer

                                 COLUMBIA SPACE (AI), INC.

                                 By:      /s/ Donald A. Doering
                                          ---------------------------------
                                          Name:    Donald A. Doering
                                          Title:   Treasurer

                                 COLUMBIA SPACE PARTNERS, INC.

                                 By:      /s/ Donald A. Doering
                                          ---------------------------------
                                          Name:    Donald A. Doering
                                          Title:   Treasurer

                                       8
<PAGE>

As a Transferee, the undersigned each agree to be bound all of the terms,
conditions and provisions set forth in this Consent Agreement with respect to
the Telcom/Columbia/Spectrum Shares and Telcom/Columbia/Spectrum Units so
Transferred.

                              MOTIENT VENTURE HOLDING INC.

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

                              MVH HOLDINGS INC.

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

                                       9

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