Paul Allen, Bill Gates, Microsoft

Microsoft Corp. co-founders Paul Allen, left, and Bill Gates pose with IBM personal computers after signing a software contract with IBM on Oct. 19, 1981.

( Microsoft Corp. via Bloomberg News / October 19, 1981 )

Microsoft Corp. co-founders Paul Allen, left, and Bill Gates pose with IBM personal computers after signing a software contract with IBM on Oct. 19, 1981.

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