WinOS

WinOS is an operating system initially created by Microsoft during the time Windows 3.1 was being developed. The OS was announced on November 17, 1991. Each version was released roughly on a yearly basis. However, 6.5 onwards was notoriously unstable and sold poorly, leading to it being discontinued in early 2002.

OS Versions

 * WinOS 1.0 (July 18, 1992)
 * WinOS 1.5 (January 3, 1993)
 * WinOS 2.0 (June 30, 1993)
 * WinOS 2.5 (November 26, 1993)
 * WinOS 3.0 (August 2, 1994)
 * WinOS 3.5 (January 28, 1995)
 * WinOS 4.0 (August 23, 1995)
 * WinOS 4.5 (June 27, 1996)
 * WinOS 5.0 (August 31, 1997)
 * WinOS 5.5 (October 26, 1998)
 * WinOS 6.0 (July 13, 1999)
 * WinOS 6.5 (January 12, 2000)
 * WinOS 7.0 (October 26, 2000)
 * WinOS 7.5 (cancelled) (Spring 2001)
 * WinOS 8.0 (cancelled) (Autumn 2001)