Windows 8

Windows 8 release date has been set according to unofficial sources for October 2012.

Windows 7

Windows 7
Launched on October 22, 2009.

Windows Vista

Windows Vista
Launched on July 22, 2005.

Windows XP

Windows XP
Launched on October 25, 2001.

Windows 98

Windows 98
Launched on June 5, 1998.
Its Codename is “Memohis”.

Windows 95

Windows 95
Launched on August 24, 1995.
Windows 5- The Arrival of Start Menu!

Windows 3.1

Windows 3.1
Launched on April 6, 1992.
It brings over 1,000 enhanvrments based upon users feedback, one of them being the StartUp.