Windows -4.00

Windows -4.00 is a prototype to the official Windows 1.00. It was released in 1960 by Microsoft Corp.

Not much is known about this Windows version, other than the fact that it exists.

Life Span

 * Started: 1960
 * Ended: Never - it was never released!

Trivia

 * This is the oldest Windows to not have an official logo, and only a custom logo.
 * This has not very much information...