EXHIBIT 32.2

                  CERTIFICATION OF PERIODIC FINANCIAL REPORTS

     I, Thomas W. Horton, Senior Executive Vice President, Chief Financial
Officer of AT&T Corp., certify, pursuant to Section 906 of the Sarbanes-Oxley
Act of 2002, that:

     (1) The Annual Report on Form 10-K for the fiscal year ended December 31,
         2004 (the "Periodic Report") which this statement accompanies, 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) Information contained in the Periodic Report fairly presents, in all
         material respects, the financial condition and results of operations of
         AT&T Corp.

                                                 /s/ THOMAS W. HORTON
                                          --------------------------------------
                                                     Thomas W. Horton
                                                 Chief Financial Officer

Dated: March 4, 2005

     A signed original of this written statement required by Section 906 has
been provided to the Company and will be retained by the Company and furnished
to the Securities and Exchange Commission or its staff upon request.