Microsoft Windows Family Tree

     |--MS-DOS----\
     |            |
     |        1.0 (1981)
     |            |
     |        5.0 (1991)
     |            |
     |        6.2 (1993)
     |            |
     |        6.22 (1994)
     |
     |
     |--Windows 3.x----\
     |                 |
     |             3.0 (1990)
     |                 |
     |             3.1 (1992)
     |                 |
     |           3.1 WFW (1992)
     |                 |
     |	       3.11 WFW (1994)
     |
     |
     |--Windows NT----\
     |                |
     |            3.1 (1993)
     |                |
     |            3.5 (1994)
     |                |
     |            3.51 (1995)
     |                |
     |	         4.0 (1996)
-MS--|
     |
     |--Windows 95----\
     |                |
     |            95 (1995)
     |                |
     |            98 (1998)
     |                |
     |           98SE (1999)
     |                |
     |            ME (2000)
     |
     |--Windows CE----\
     |                |
     |            1.0 (1996)
     |                |
     |            2.0 (1997)
     |                |
     |            2.1 (1998)
     |                |
     |            3.0 (1999) Pocket PC?
     |
     |--Windows 2000----\
     |                  |
     |              2000 (2000)
     |                  |
     |               XP (2001)
     |
     |--Windows .NET----\
                        |
                  Windows 2003?

Source: "http://www.computerhope.com/history/windows.htm"