CERTIFICATE OF AMENDMENT

OF

CERTIFICATE OF INCORPORATION

OF

PAETEC COMMUNICATIONS, INC.

Pursuant to Section 242 of the General Corporation Law at the State of Delaware

PAETEC COMMUNICATIONS, INC., a corporation incorporated, organized and existing under

the laws of the State of Delaware, hereby certifies as follows:

FIRST: The name of the corporation is PaeTec Communications, Inc. (the “Corporation”).

SECOND: The amendment to the Certificate of Incorporation to be effected is as follows:

Article FOURTH of the Certificate of Incorporation, relating to the shares of the Corporation is amended to read as follows:

“FOURTH: The aggregate number of shares which the Corporation shall have authority to issue is 1,500 shares, all of which shall be Common Shares with no par value.”

THIRD: The Amendment set forth herein was duly adopted and approved by the Board of Directors of the Corporation by unanimous written consent as permitted under the Bylaws and Section 141(f) of the General Corporation Law, and by the written consent of the stockholder having a majority of the votes entitled to be cast, in accordance with Section 228 of the General Corporation Law. This Amendment was duly adopted in accordance with the provisions of Section 242 of the General Corporation Law.

IN WITNESS WHEREOF the undersigned, a duly authorized officer of the Corporation, has executed this Certificate on October 28, 1999.