In August 1985, Microsoft and IBM partnered in the development of a different operating system called OS/2. On November 20, 1985, Microsoft released its first retail version of Microsoft Windows, originally a graphical extension for its MS-DOS operating system. On March 13, 1986 the company went public with an IPO, with a starting initial offering price of $21.00 and ending at the first day of trading as at US $28.00. In 1987, Microsoft eventually released their first version of OS/2 to OEMs.

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