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MCI, Inc. (formerly WorldCom and MCI WorldCom) was a telecommunications company. For a time, it was the second-largest long-distance telephone company in the United States, after AT&T.
Global business and residential communications company operating in more than 65 countries.
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MCI Communications Corporation (originally Microwave Communications, Inc.) was a telecommunications company headquartered in Washington, D.C. that was at one point the second-largest long-distance provider in the United States.
