Microsoft entered the OS business in 1980 with its own version of Unix, called Xenix.However, it was DOS (Disk Operating System) that solidified the company's dominance. After negotiations with Digital Research failed, IBM awarded a contract to Microsoft in November 1980 to provide a version of the CP/M OS, which was set to be used in the upcoming IBM Personal Computer (IBM PC).For this deal, Microsoft purchased a CP/M clone called 86-DOS from Seattle Computer Products, branding it as MS-DOS, which IBM rebranded to PC-DOS. Following the release of the IBM PC in August 1981, Microsoft retained ownership of MS-DOS. Since IBM copyrighted the IBM PC BIOS, other companies had to reverse engineer it in order for non-IBM hardware to run as IBM PC compatibles, but no such restriction applied to the operating systems. Due to various factors, such as MS-DOS's available software selection, Microsoft eventually became the leading PC OS vendor.The company expanded into new markets with the release of the Microsoft Mouse in 1983, as well as a publishing division named Microsoft Press.Paul Allen resigned from Microsoft in February after developing Hodgkin's disease
More Choice : History Microsoft , Microsoft Corporation , Microsoft Windows ,CEO Microsoft " PAUL GARDNER ALLEN " , CEO Microsoft " Bill Gates", Ms- DOS , Altair 8800,Windows 7 , Windows Vista , Windows XP , Microsoft Office 2007
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