POWER OF ATTORNEY



KNOW ALL MEN BY THESE PRESENTS:

         WHEREAS, AT&T CORP., a New York corporation (hereinafter referred to as
the  "Company"),  proposes to file with the Securities and Exchange  Commission,
under the  provisions of the  Securities  Exchange Act of 1934,  as amended,  an
annual report on Form 10-K; and

         WHEREAS,  the  undersigned  is both a  director  and an  officer of the
Company, as indicated below his signature:

         NOW,  THEREFORE,  the undersigned hereby constitutes and appoints C. H.
NOSKI,  N. S. CYPRUS AND M. J. WASSER and each of them,  as attorney for him and
in his name,  place and stead,  and in his  capacity  as both a director  and an
officer of the Company,  to execute and file such annual report,  and thereafter
to execute and file any  amendments  or  amendments  thereto,  hereby giving and
granting to said attorneys, and each of them, full power and authority to do and
perform each and every act and thing  whatsoever  requisite  and necessary to be
done in and about the premises,  as fully,  to all intents and  purposes,  as he
might or could do if personally  present at the doing thereof,  hereby ratifying
and  confirming all that said attorneys may or shall lawfully do, or cause to be
done, by virtue hereof.

         IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney
this 27th day of March, 2000.




                                   /s/   C. Michael Armstrong
                                   -----------------------------
                                         C. Michael Armstrong
                                         Chairman of the Board and Director

<PAGE>

                                POWER OF ATTORNEY



KNOW ALL MEN BY THESE PRESENTS:

         WHEREAS, AT&T CORP., a New York corporation (hereinafter referred to as
the  "Company"),  proposes to file with the Securities and Exchange  Commission,
under the  provisions of the  Securities  Exchange Act of 1934,  as amended,  an
annual report on Form 10-K; and

         WHEREAS,  the  undersigned  is both a  director  and an  officer of the
Company, as indicated below his signature:

         NOW,  THEREFORE,  the undersigned hereby constitutes and appoints C. H.
NOSKI,  N. S. CYPRUS AND M. J. WASSER and each of them, as attorneys for him and
in his name,  place and stead, and in his capacity as an officer of the Company,
to execute and file such annual  report,  and thereafter to execute and file any
amendments or amendments thereto,  hereby giving and granting to said attorneys,
and each of them,  full power and authority to do and perform each and every act
and  thing  whatsoever  requisite  and  necessary  to be done in and  about  the
premises,  as fully,  to all  intents and  purposes,  as he might or could do if
personally  present at the doing  thereof,  hereby  ratifying and confirming all
that said  attorneys  may or shall  lawfully do, or cause to be done,  by virtue
hereof.

         IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney
this 27th day of March, 2000.




                                   /s/  J. D. Zeglis
                                   -----------------------------
                                        J. D. Zeglis
                                        President and Director

<PAGE>

                                POWER OF ATTORNEY



KNOW ALL MEN BY THESE PRESENTS:

         WHEREAS, AT&T CORP., a New York corporation (hereinafter referred to as
the  "Company"),  proposes to file with the Securities and Exchange  Commission,
under the  provisions of the  Securities  Exchange Act of 1934,  as amended,  an
annual report on Form 10-K; and

         WHEREAS,  the  undersigned  is an officer of the Company,  as indicated
below his signature:

         NOW,  THEREFORE,  the undersigned hereby constitutes and appoints C. H.
NOSKI,  N. S. CYPRUS AND M. J. WASSER and each of them, as attorneys for him and
in his name,  place and stead, and in his capacity as an officer of the Company,
to execute and file such annual  report,  and thereafter to execute and file any
amendments or amendments thereto,  hereby giving and granting to said attorneys,
and each of them,  full power and authority to do and perform each and every act
and  thing  whatsoever  requisite  and  necessary  to be done in and  about  the
premises,  as fully,  to all  intents and  purposes,  as he might or could do if
personally  present at the doing  thereof,  hereby  ratifying and confirming all
that said  attorneys  may or shall  lawfully do, or cause to be done,  by virtue
hereof.

         IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney
this 27th day of March, 2000.




                                   /s/  Charles H. Noski
                                   -----------------------------
                                        Charles H. Noski
                                        Senior Executive Vice President
                                          and Chief Financial Officer

<PAGE>

                                POWER OF ATTORNEY



KNOW ALL MEN BY THESE PRESENTS:

         WHEREAS, AT&T CORP., a New York corporation (hereinafter referred to as
the  "Company"),  proposes to file with the Securities and Exchange  Commission,
under the  provisions of the  Securities  Exchange Act of 1934,  as amended,  an
annual report on Form 10-K; and

         WHEREAS,  the  undersigned  is an officer of the Company,  as indicated
below her signature:

         NOW,  THEREFORE,  the undersigned hereby constitutes and appoints C. H.
NOSKI, N. S. CYPRUS AND M. J. WASSER, and each of them, as attorneys for her and
in her name,  place and stead, and in her capacity as an officer of the Company,
to execute and file such annual  report,  and thereafter to execute and file any
amendments or amendments thereto,  hereby giving and granting to said attorneys,
and each of them,  full power and authority to do and perform each and every act
and  thing  whatsoever  requisite  and  necessary  to be done in and  about  the
premises,  as fully,  to all intents and  purposes,  as she might or could do if
personally  present at the doing  thereof,  hereby  ratifying and confirming all
that said  attorneys  may or shall  lawfully do, or cause to be done,  by virtue
hereof.

         IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney
this 27th day of March, 2000.




                                   /s/  Nicholas S. Cyprus
                                   -----------------------------
                                        Nicholas S. Cyprus
                                        Vice President and Controller

<PAGE>

                                POWER OF ATTORNEY



KNOW ALL MEN BY THESE PRESENTS:

         WHEREAS, AT&T CORP., a New York corporation (hereinafter referred to as
the  "Company"),  proposes to file with the Securities and Exchange  Commission,
under the  provisions of the  Securities  Exchange Act of 1934,  as amended,  an
annual report on Form 10-K; and

         WHEREAS, the undersigned is a director of the Company:

         NOW,  THEREFORE,  the undersigned hereby constitutes and appoints C. H.
NOSKI,  N. S. CYPRUS AND M. J. WASSER and each of them,  as attorneys for him or
her and in his or her name,  place and stead,  and in his or her  capacity  as a
director of the Company,  to execute and file such annual report, and thereafter
to execute and file any  amendments  or  amendments  thereto,  hereby giving and
granting to said attorneys, and each of them, full power and authority to do and
perform each and every act and thing  whatsoever  requisite  and necessary to be
done in and about the premises,  as fully, to all intents and purposes, as he or
she  might  or could do if  personally  present  at the  doing  thereof,  hereby
ratifying and  confirming  all that said  attorneys may or shall lawfully do, or
cause to be done, by virtue hereof.

         IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney
this 27th day of March, 2000.




                                   /s/  Kenneth T. Derr
                                   -----------------------------
                                        Kenneth T. Derr
                                        Director

<PAGE>

                                POWER OF ATTORNEY



KNOW ALL MEN BY THESE PRESENTS:

         WHEREAS, AT&T CORP., a New York corporation (hereinafter referred to as
the  "Company"),  proposes to file with the Securities and Exchange  Commission,
under the  provisions of the  Securities  Exchange Act of 1934,  as amended,  an
annual report on Form 10-K; and

         WHEREAS, the undersigned is a director of the Company:

         NOW,  THEREFORE,  the undersigned hereby constitutes and appoints C. H.
NOSKI,  N. S. CYPRUS AND M. J. WASSER and each of them,  as attorneys for him or
her and in his or her name,  place and stead,  and in his or her  capacity  as a
director of the Company,  to execute and file such annual report, and thereafter
to execute and file any  amendments  or  amendments  thereto,  hereby giving and
granting to said attorneys, and each of them, full power and authority to do and
perform each and every act and thing  whatsoever  requisite  and necessary to be
done in and about the premises,  as fully, to all intents and purposes, as he or
she  might  or could do if  personally  present  at the  doing  thereof,  hereby
ratifying and  confirming  all that said  attorneys may or shall lawfully do, or
cause to be done, by virtue hereof.

         IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney
this 27th day of March, 2000.




                                   /s/  M. Kathryn Eickhoff
                                   -----------------------------
                                        M. Kathryn Eickhoff
                                        Director

<PAGE>

                                POWER OF ATTORNEY



KNOW ALL MEN BY THESE PRESENTS:

         WHEREAS, AT&T CORP., a New York corporation (hereinafter referred to as
the  "Company"),  proposes to file with the Securities and Exchange  Commission,
under the  provisions of the  Securities  Exchange Act of 1934,  as amended,  an
annual report on Form 10-K; and

         WHEREAS, the undersigned is a director of the Company:

         NOW,  THEREFORE,  the undersigned hereby constitutes and appoints C. H.
NOSKI,  N. S. CYPRUS AND M. J. WASSER and each of them,  as attorneys for him or
her and in his or her name,  place and stead,  and in his or her  capacity  as a
director of the Company,  to execute and file such annual report, and thereafter
to execute and file any  amendments  or  amendments  thereto,  hereby giving and
granting to said attorneys, and each of them, full power and authority to do and
perform each and every act and thing  whatsoever  requisite  and necessary to be
done in and about the premises,  as fully, to all intents and purposes, as he or
she  might  or could do if  personally  present  at the  doing  thereof,  hereby
ratifying and  confirming  all that said  attorneys may or shall lawfully do, or
cause to be done, by virtue hereof.

         IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney
this 27th day of March, 2000.




                                   /s/  Walter Y. Elisha
                                   -----------------------------
                                        Walter Y. Elisha
                                        Director

<PAGE>

                                POWER OF ATTORNEY



KNOW ALL MEN BY THESE PRESENTS:

         WHEREAS, AT&T CORP., a New York corporation (hereinafter referred to as
the  "Company"),  proposes to file with the Securities and Exchange  Commission,
under the  provisions of the  Securities  Exchange Act of 1934,  as amended,  an
annual report on Form 10-K; and

         WHEREAS, the undersigned is a director of the Company:

         NOW,  THEREFORE,  the undersigned hereby constitutes and appoints C. H.
NOSKI,  N. S. CYPRUS AND M. J. WASSER and each of them,  as attorneys for him or
her and in his or her name,  place and stead,  and in his or her  capacity  as a
director of the Company,  to execute and file such annual report, and thereafter
to execute and file any  amendments  or  amendments  thereto,  hereby giving and
granting to said attorneys, and each of them, full power and authority to do and
perform each and every act and thing  whatsoever  requisite  and necessary to be
done in and about the premises,  as fully, to all intents and purposes, as he or
she  might  or could do if  personally  present  at the  doing  thereof,  hereby
ratifying and  confirming  all that said  attorneys may or shall lawfully do, or
cause to be done, by virtue hereof.

         IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney
this 27th day of March, 2000.




                                   /s/  George M. C. Fisher
                                   -----------------------------
                                        George M. C. Fisher
                                        Director

<PAGE>

                                POWER OF ATTORNEY



KNOW ALL MEN BY THESE PRESENTS:

         WHEREAS, AT&T CORP., a New York corporation (hereinafter referred to as
the  "Company"),  proposes to file with the Securities and Exchange  Commission,
under the  provisions of the  Securities  Exchange Act of 1934,  as amended,  an
annual report on Form 10-K; and

         WHEREAS, the undersigned is a director of the Company:

         NOW,  THEREFORE,  the undersigned hereby constitutes and appoints C. H.
NOSKI,  N. S. CYPRUS AND M. J. WASSER and each of them,  as attorneys for him or
her and in his or her name,  place and stead,  and in his or her  capacity  as a
director of the Company,  to execute and file such annual report, and thereafter
to execute and file any  amendments  or  amendments  thereto,  hereby giving and
granting to said attorneys, and each of them, full power and authority to do and
perform each and every act and thing  whatsoever  requisite  and necessary to be
done in and about the premises,  as fully, to all intents and purposes, as he or
she  might  or could do if  personally  present  at the  doing  thereof,  hereby
ratifying and  confirming  all that said  attorneys may or shall lawfully do, or
cause to be done, by virtue hereof.

         IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney
this 27th day of March, 2000.




                                   /s/  Donald V. Fites
                                   -----------------------------
                                        Donald V. Fites
                                        Director

<PAGE>

                                POWER OF ATTORNEY



KNOW ALL MEN BY THESE PRESENTS:

         WHEREAS, AT&T CORP., a New York corporation (hereinafter referred to as
the  "Company"),  proposes to file with the Securities and Exchange  Commission,
under the  provisions of the  Securities  Exchange Act of 1934,  as amended,  an
annual report on Form 10-K; and

         WHEREAS, the undersigned is a director of the Company:

         NOW,  THEREFORE,  the undersigned hereby constitutes and appoints C. H.
NOSKI,  N. S. CYPRUS AND M. J. WASSER and each of them,  as attorneys for him or
her and in his or her name,  place and stead,  and in his or her  capacity  as a
director of the Company,  to execute and file such annual report, and thereafter
to execute and file any  amendments  or  amendments  thereto,  hereby giving and
granting to said attorneys, and each of them, full power and authority to do and
perform each and every act and thing  whatsoever  requisite  and necessary to be
done in and about the premises,  as fully, to all intents and purposes, as he or
she  might  or could do if  personally  present  at the  doing  thereof,  hereby
ratifying and  confirming  all that said  attorneys may or shall lawfully do, or
cause to be done, by virtue hereof.

         IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney
this 27th day of March, 2000.




                                   /s/  Amos B. Hostetter, Jr.
                                   -----------------------------
                                        Amos B. Hostetter, Jr.
                                        Director

<PAGE>

                                POWER OF ATTORNEY



KNOW ALL MEN BY THESE PRESENTS:

         WHEREAS, AT&T CORP., a New York corporation (hereinafter referred to as
the  "Company"),  proposes to file with the Securities and Exchange  Commission,
under the  provisions of the  Securities  Exchange Act of 1934,  as amended,  an
annual report on Form 10-K; and

         WHEREAS, the undersigned is a director of the Company:

         NOW,  THEREFORE,  the undersigned hereby constitutes and appoints C. H.
NOSKI,  N. S. CYPRUS AND M. J. WASSER and each of them,  as attorneys for him or
her and in his or her name,  place and stead,  and in his or her  capacity  as a
director of the Company,  to execute and file such annual report, and thereafter
to execute and file any  amendments  or  amendments  thereto,  hereby giving and
granting to said attorneys, and each of them, full power and authority to do and
perform each and every act and thing  whatsoever  requisite  and necessary to be
done in and about the premises,  as fully, to all intents and purposes, as he or
she  might  or could do if  personally  present  at the  doing  thereof,  hereby
ratifying and  confirming  all that said  attorneys may or shall lawfully do, or
cause to be done, by virtue hereof.

         IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney
this 27th day of March, 2000.




                                   /s/  Ralph S. Larsen
                                   -----------------------------
                                        Ralph S. Larsen
                                        Director

<PAGE>

                                POWER OF ATTORNEY



KNOW ALL MEN BY THESE PRESENTS:

         WHEREAS, AT&T CORP., a New York corporation (hereinafter referred to as
the  "Company"),  proposes to file with the Securities and Exchange  Commission,
under the  provisions of the  Securities  Exchange Act of 1934,  as amended,  an
annual report on Form 10-K; and

         WHEREAS, the undersigned is a director of the Company:

         NOW,  THEREFORE,  the undersigned hereby constitutes and appoints C. H.
NOSKI,  N. S. CYPRUS AND M. J. WASSER and each of them,  as attorneys for him or
her and in his or her name,  place and stead,  and in his or her  capacity  as a
director of the Company,  to execute and file such annual report, and thereafter
to execute and file any  amendments  or  amendments  thereto,  hereby giving and
granting to said attorneys, and each of them, full power and authority to do and
perform each and every act and thing  whatsoever  requisite  and necessary to be
done in and about the premises,  as fully, to all intents and purposes, as he or
she  might  or could do if  personally  present  at the  doing  thereof,  hereby
ratifying and  confirming  all that said  attorneys may or shall lawfully do, or
cause to be done, by virtue hereof.

         IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney
this 27th day of March, 2000.




                                   /s/  John C. Malone
                                   -----------------------------
                                        John C. Malone
                                        Director

<PAGE>

                                POWER OF ATTORNEY



KNOW ALL MEN BY THESE PRESENTS:

         WHEREAS, AT&T CORP., a New York corporation (hereinafter referred to as
the  "Company"),  proposes to file with the Securities and Exchange  Commission,
under the  provisions of the  Securities  Exchange Act of 1934,  as amended,  an
annual report on Form 10-K; and

         WHEREAS, the undersigned is a director of the Company:

         NOW,  THEREFORE,  the undersigned hereby constitutes and appoints C. H.
NOSKI,  N. S. CYPRUS AND M. J. WASSER and each of them,  as attorneys for him or
her and in his or her name,  place and stead,  and in his or her  capacity  as a
director of the Company,  to execute and file such annual report, and thereafter
to execute and file any  amendments  or  amendments  thereto,  hereby giving and
granting to said attorneys, and each of them, full power and authority to do and
perform each and every act and thing  whatsoever  requisite  and necessary to be
done in and about the premises,  as fully, to all intents and purposes, as he or
she  might  or could do if  personally  present  at the  doing  thereof,  hereby
ratifying and  confirming  all that said  attorneys may or shall lawfully do, or
cause to be done, by virtue hereof.

         IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney
this 27th day of March, 2000.




                                   /s/  Donald F. McHenry
                                   -----------------------------
                                        Donald F. McHenry
                                        Director

<PAGE>

                                POWER OF ATTORNEY



KNOW ALL MEN BY THESE PRESENTS:

         WHEREAS, AT&T CORP., a New York corporation (hereinafter referred to as
the  "Company"),  proposes to file with the Securities and Exchange  Commission,
under the  provisions of the  Securities  Exchange Act of 1934,  as amended,  an
annual report on Form 10-K; and

         WHEREAS, the undersigned is a director of the Company:

         NOW,  THEREFORE,  the undersigned hereby constitutes and appoints C. H.
NOSKI,  N. S. CYPRUS AND M. J. WASSER and each of them,  as attorneys for him or
her and in his or her name,  place and stead,  and in his or her  capacity  as a
director of the Company,  to execute and file such annual report, and thereafter
to execute and file any  amendments  or  amendments  thereto,  hereby giving and
granting to said attorneys, and each of them, full power and authority to do and
perform each and every act and thing  whatsoever  requisite  and necessary to be
done in and about the premises,  as fully, to all intents and purposes, as he or
she  might  or could do if  personally  present  at the  doing  thereof,  hereby
ratifying and  confirming  all that said  attorneys may or shall lawfully do, or
cause to be done, by virtue hereof.

         IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney
this 27th day of March, 2000.




                                   /s/  Michael I. Sovern
                                   -----------------------------
                                        Michael I. Sovern
                                        Director

<PAGE>

                                POWER OF ATTORNEY



KNOW ALL MEN BY THESE PRESENTS:

         WHEREAS, AT&T CORP., a New York corporation (hereinafter referred to as
the  "Company"),  proposes to file with the Securities and Exchange  Commission,
under the  provisions of the  Securities  Exchange Act of 1934,  as amended,  an
annual report on Form 10-K; and

         WHEREAS, the undersigned is a director of the Company:

         NOW,  THEREFORE,  the undersigned hereby constitutes and appoints C. H.
NOSKI,  N. S. CYPRUS AND M. J. WASSER and each of them,  as attorneys for him or
her and in his or her name,  place and stead,  and in his or her  capacity  as a
director of the Company,  to execute and file such annual report, and thereafter
to execute and file any  amendments  or  amendments  thereto,  hereby giving and
granting to said attorneys, and each of them, full power and authority to do and
perform each and every act and thing  whatsoever  requisite  and necessary to be
done in and about the premises,  as fully, to all intents and purposes, as he or
she  might  or could do if  personally  present  at the  doing  thereof,  hereby
ratifying and  confirming  all that said  attorneys may or shall lawfully do, or
cause to be done, by virtue hereof.

         IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney
this 27th day of March, 2000.




                                   /s/  Sanford I. Weill
                                   -----------------------------
                                        Sanford I. Weill
                                        Director

<PAGE>

                                POWER OF ATTORNEY



KNOW ALL MEN BY THESE PRESENTS:

         WHEREAS, AT&T CORP., a New York corporation (hereinafter referred to as
the  "Company"),  proposes to file with the Securities and Exchange  Commission,
under the  provisions of the  Securities  Exchange Act of 1934,  as amended,  an
annual report on Form 10-K; and

         WHEREAS, the undersigned is a director of the Company:

         NOW,  THEREFORE,  the undersigned hereby constitutes and appoints C. H.
NOSKI,  N. S. CYPRUS AND M. J. WASSER and each of them,  as attorneys for him or
her and in his or her name,  place and stead,  and in his or her  capacity  as a
director of the Company,  to execute and file such annual report, and thereafter
to execute and file any  amendments  or  amendments  thereto,  hereby giving and
granting to said attorneys, and each of them, full power and authority to do and
perform each and every act and thing  whatsoever  requisite  and necessary to be
done in and about the premises,  as fully, to all intents and purposes, as he or
she  might  or could do if  personally  present  at the  doing  thereof,  hereby
ratifying and  confirming  all that said  attorneys may or shall lawfully do, or
cause to be done, by virtue hereof.

         IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney
this 27th day of March, 2000.




                                   /s/  Thomas H. Wyman
                                   -----------------------------
                                        Thomas H. Wyman
                                        Director