MCI Communications

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MCI Communications Corporation

Formerly	Microwave Communications Inc. (1963-1968) Microwave Communications of America Inc. (1968-1971)
Industry	Telecommunications
Founded	October 3, 1963; 61 years ago (1963-10-03)
Defunct	September 15, 1998; 26 years ago (1998-09-15)
Fate	Acquired by WorldCom
Successor	MCI WorldCom
Headquarters	Washington, D.C., U.S.
Key people	William G. McGowan
Products	Conferencing, Contact Centers, Data and IP Services, Internet access, IT Solutions and Hosting, Managed Networks, Premises Equipment (CPE), Security, Voice, VoIP, Wireless
Website	mci.com at the Wayback Machine (archived 1997-02-17)

MCI Communications Corporation (originally Microwave Communications, Inc.) was an American telecommunications company headquartered in Washington, D.C. that was at one point the second-largest long-distance provider in the United States.

MCI was instrumental in legal and regulatory changes that led to the breakup of the Bell System and introduced competition in the U.S. telephone industry.^[1] Its MCI Mail, launched in 1983, was one of the first Email services and its MCI.net was an integral part of the Internet backbone.

The company was acquired by WorldCom in 1998.