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  2. Microsoft - Wikipedia

    en.wikipedia.org/wiki/Microsoft

    Windows 1.0 was released on November 20, 1985, as the first version of the Windows line. Microsoft released Windows 1.0 on November 20, 1985, as a graphical extension for MS-DOS, [11]: 242–243, 246 despite having begun jointly developing OS/2 with IBM that August. [26]