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Oh Mr. Gates, how the time flies!

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1975

Microsoft (then spelled “Micro Soft”) is founded by William “Bill” Gates, a 20-year-old Harvard dropout, and Paul Allen, his 22-year-old school chum. They begin selling its first product, a BASIC programming language interpreter.

1980

Microsoft signs an agreement to build the operating system that became known as MS-DOS for IBM’s new personal computer, which was launched in 1981. Microsoft was allowed to license the operating system to others, spawning an industry of “IBM-compatible” machines dependent on Microsoft software.

1983

February: Paul Allen, ill with Hodgkin’s disease, resigns from active management of the company but remains on the board of directors.