XO Communications 2010 Annual Report Download - page 93

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Exhibit 32.1
CERTIFICATION
Pursuant to 18 U.S.C. Section 1350, As Adopted Pursuant to Section 906
of the Sarbanes-Oxley Act of 2002
In connection with the Annual Report of XO Holdings, Inc. (the ‘‘registrant’’) on Form 10-K for the year
ended December 31, 2010 as filed with the Securities and Exchange Commission on the date hereof (the
‘‘Report’’) we, Carl J. Grivner, Chief Executive Officer, and Laura W. Thomas, Senior Vice President and
Chief Financial Officer of the Registrant, certify that, to the best of our knowledge:
1. The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities
Exchange Act of 1934 (15 U.S.C. 78m or 78o(d)); and
2. The information contained in the Report fairly presents, in all material respects, the financial
condition and results of operations of the registrant.
Date: March 31, 2011
/s/ Carl J. Grivner
Carl J. Grivner
Chief Executive Officer
(Principal Executive Officer)
/s/ Laura W. Thomas
Laura W. Thomas
Senior Vice President and Chief Financial Officer
(Principal Financial Officer)