Apple Lisa Office System 1 (released in 1983)

VisiCorp Visi On (released in 1984)

Mac OS System 1.0 (released in 1984)

Amiga Workbench 1.0 (released in 1985)

Windows 1.0x (released in 1985)

GEM (released in 1985)

1986 - 1990
IRIX 3 (released in 1986, first release 1984)

GEOS (released in 1986)

Windows 2.0x (released in 1987)

OS/2 1.x (released in 198

NeXTSTEP / OPENSTEP 1.0 (released in 1989)

OS/2 1.20 (released in 1989)

Windows 3.0 (released in 1990)

1991 - 1995
Amiga Workbench 2.04 (released in 1991)

Mac OS System 7 (released in 1991)

Windows 3.1 (released in 1992)

OS/2 2.0 (released in 1992)

Windows 95 (released in 1995)

1996 - 2000
OS/2 Warp 4 (released in 1996)

Mac OS System 8 (released in 1997)

Windows 98 (released in 199

KDE 1.0 (released in 199

BeOs 4.5 (released in 1999)

GNOME 1.0 (released in 1999)

2001 - 2005
Mac OS X (released in 2001)

Windows XP (released in 2001)

KDE 3 (released in 2002)

2007 - 2009 (current)
Windows Vista (released in 2007)

Mac OS X Leopard (released in 2007)

GNOME 2.24 (200

KDE (v4.0 Jan. 2008, v4.2 Mar. 2009)