September 9, 1999 – Purchased CAMPUSLINK Communications Systems, a privately owned telecommunications company based in Ann Arbor, Michigan.
August 19, 2004 – Purchased Covista North East Call Zone (Covista Still Privately owned company, also operating as Total Tel)
January 4, 2005 – Purchased American Long Lines, a privately owned telecommunications company.
February 28, 2007 – Acquired Charlotte, North Carolina–based telecommunications company US LEC, becoming the publicly traded PAETEC Holding Corp
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October 12, 2007 – Acquired Allworx Corp
February 8, 2008 – Acquired McLeodUSA
December 6, 2010 – Acquired Cavalier Telephone Corporation
December 28, 2010 – Acquired FTS Ltd. subsidiary, Leap RevChain
May 31, 2011 – Acquired XETA Technologies, Inc.
December 1, 2011 – Acquired by Windstream Communications
PAETEC owned the naming rights to PAETEC Park, a soccer-specific stadium in nearby Rochester, New York, from its opening in 2006 to 2008.