The Free On-line Dictionary of Computing (30 December 2018):

Microsoft Windows
MS-Windows

    Microsoft's proprietary window system
   and user interface software released in 1985 to run on top
   of MS-DOS.  Widely criticised for being too slow (hence
   "Windoze", "Microsloth Windows") on the machines available
   then.

   The 1996 market share of operating systems was:

    DOS/Windows  70%
    Windows 95   15%
    Windows NT    2%
    Other        13%

   Versions include 1985 Windows 1, 1987 Windows 2, 1987
   Windows/386, 1990 Windows 3.0, 1992 Windows 3.1, 1992
   Windows for Workgroups 3.1, 1993 Windows 3.11, 1993 Windows
   for Workgroups 3.11, 1993 Windows NT 3.1, 1994 Windows NT
   3.5, 1995 Windows 95, 199? Windows NT 4, 1998 Windows 98,
   Windows NT 5, Windows XP, Windows 7, Windows 8.

   (2015-03-07)