Exhibit 10.77

ACKNOWLEDGMENT AGREEMENT

This Acknowledgment Agreement, dated as of December 7, 2009 (this “Agreement”),
is entered into by the Sponsor Shareholders (as defined below) of Intelsat
Global, Ltd., a Bermuda exempted company (the “Company”).

WHEREAS, pursuant to Section 15(j) of the Management Shareholders Agreement of
the Company (as amended from time to time, the “MSA”), the MSA may be amended by
a resolution of the Company’s Board of Directors (the “Board”); provided that
any such amendment is approved by the BC Investors (as defined in the MSA) and
Silver Lake (as defined in the MSA) (the “Sponsor Shareholders”);

WHEREAS, on December 7, 2009, by a resolution of the Board, the Board adopted
certain amendments to the MSA, effective as of December 15, 2009, in
substantially the form attached hereto as Exhibit A (the “MSA Amendment”); and

WHEREAS, the Sponsor Shareholders desire to approve the MSA Amendment as adopted
by the Board.

NOW, THEREFORE, in consideration of the foregoing, the Sponsor Shareholders
hereby approve the MSA Amendment.

This Agreement may be executed in counterparts, each of which when so executed
shall be deemed an original and all of which taken together shall constitute one
and the same instrument.

[signature pages follow]

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IN WITNESS WHEREOF, the Sponsor Shareholders have caused this Agreement to be
duly executed as of the date first written above.

 

For and on behalf of the Limited Partnerships comprising

BC European Capital VIII – 1 to 12 and 14 to 34:

 

Matthew Elston Director, CIE Management II Limited acting as General Partner of
the Limited Partnerships comprising BC European Capital VIII – 1 to 12 and 14 to
34

 

Laurence McNairn Director, CIE Management II Limited acting as General Partner
of the Limited Partnerships comprising BC European Capital VIII – 1 to 12 and 14
to 34 For and on behalf of BC European Capital 35 SC:

 

Matthew Elston

Director, LMBO Europe SAS

As Gérant to BC European Capital 35 SC

 

[Signature Page to Acknowledgment Agreement]

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For and on behalf of BC European Capital 36 SC:

 

Matthew Elston

Director, LMBO Europe SAS

As Gérant to BC European Capital 36 SC For and on behalf of BC European Capital
37 SC:

 

Matthew Elston

Director, LMBO Europe SAS

As Gérant to BC European Capital 37 SC For and on behalf of BC European
Capital-Intelsat Syndication L.P.:

 

Matthew Elston

Director, CIE Management II Limited acting as General Partner of BC European
Capital – Intelsat Syndication L.P.

 

Laurence McNairn Director, CIE Management II Limited acting as General Partner
of BC European Capital – Intelsat Syndication L.P.

 

[Signature Page to Acknowledgment Agreement]

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For and on behalf of BC European Capital 38 SC:

 

Matthew Elston

Director, LMBO Europe SAS

As Gérant to BC European Capital 38 SC For and on behalf of BC European Capital
39 SC:

 

Matthew Elston

Director, LMBO Europe SAS

As Gérant to BC European Capital 39 SC For and on behalf of BC European Capital
– Intelsat Co-Investment:

 

Matthew Elston

Director, CIE Management II Limited acting as General Partner of BC European
Capital – Intelsat Co-Investment

 

Laurence McNairn Director, CIE Management II Limited acting as General Partner
of BC European Capital – Intelsat Co-Investment

 

[Signature Page to Acknowledgment Agreement]

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For and on behalf of BC European Capital – Intelsat Co-Investment 1:

 

Matthew Elston

Director, CIE Management II Limited acting as General Partner of BC European
Capital – Intelsat Co-Investment 1

 

Laurence McNairn Director, CIE Management II Limited acting as General Partner
of BC European Capital – Intelsat Co-Investment 1

 

[Signature Page to Acknowledgment Agreement]

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SILVER LAKE PARTNERS III, L.P. By:   Silver Lake Technology Associates III,
L.P.,   its general partner By:   SLTA III (GP), L.L.C., its general partner  
its general partner By:   Silver Lake Group, L.L.C., its managing member By:  

 

  Name:     Title:   SILVER LAKE TECHNOLOGY INVESTORS III, L.P. By:   Silver
Lake Technology Associates III, L.P.,   its general partner By:   SLTA III (GP),
L.L.C., its general partner By:   Silver Lake Group, L.L.C., its managing member
By:  

 

  Name:     Title:  

 

[Signature Page to Acknowledgment Agreement]