Timeline: Microsoft Windows | Timetoast

Nov 20, 1985

Windows 1.0

x86-16-bit
Dec 9, 1987

Windows 2.0

x86-16-bit
May 27, 1988

Windows 2.10

x86-16-bit
Mar 13, 1989

Windows 2.11

x86-16-bit
May 22, 1990

Windows 3.0

x86-16-bit
Oct 20, 1991

Windows 3.0 with Multimedia Extensions

x86-16-bit
Apr 6, 1992

Windows 3.1

x86-16-bit
Oct 27, 1992

Windows for Workgroups 3.1

x86-16-bit
Jul 27, 1993

Windows Nt 3.1

IA-32
Nov 8, 1993

Windows for workgroups 3.11

x86-16-bit
Sep 21, 1994

Windows NT 3.5

IA-32
May 30, 1995

Windows 95

IA-32, DEC Alpha, powerPC
Aug 24, 1996

Windows NT 4.0
Jun 25, 1998

Windows 98

IA-32
May 5, 1999

Windows 98 SE

IA-32
Feb 17, 2000

Windows 2000

IA-32
Sep 14, 2000

Windows ME
Oct 25, 2001

Windows XP

IA-32
Oct 25, 2001

Windows XP 64-bit Edition (v2002)

Itanium
Oct 31, 2002

Windows XP Media Center Edition

IA-32
Nov 8, 2006

Windows Vista

IA-32, x64
Jul 22, 2009

Windows 7

IA-32,x64
Oct 26, 2012

Windows 8

IA-32, x64
Oct 26, 2012

Windows RT

ARM
Oct 18, 2013

Windows 8.1

Windows RT 8.1
Windows Server 2012 R2 Were also released on the same day
Feb 10, 2015

Windows XP-Bit Edition (v2003)

Itanium