1973 - Xerox Alto
1981 - Xerox Star
1983 - Apple Lisa
1984 - VisCorp VisiOn
1984 - Mac OS System 1.0
1985 - Amiga Workbench 1.0
1985 - Windows 1.0x
1985 - GEM
1986 - IRIX 3
1986 - GEOS
1987 - Windows 2.0x
1988 - OS/2 1.x
1989 - NeXTSTEP / OPENSTEP 1.0
1989 - OS/2 1.20
1990 - Windows 3.0
1991 - Amiga Workbench 2.04
1991 - Mac OS System 7
1992 - Windows 3.1
1992 - OS/2 2.0
1995 - Windows 95
1996 - OS/2 Warp 4
1997 - Mac OS System 8
1998 - Windows 98
1998 - KDE 1.0
1999 - BeOs 4.5
1999 - GNOME 1.0
2000 - KDE 2.0
2001 - Mac OS X
2001 - Windows XP
2002 - KDE 3.0
2007 - Windows Vista
2007 - Mac OS Leopard
2008 - Gnome 2.0
2008 - KDE 4.0
2009 - Windows 7
