Windows 3.0
Windows 3.0 is the third major release of Microsoft Windows, and was released on May 20, 1990. It is a graphical environment (a program that runs on top of an operating system), instead of an operating system by itself. It became the first successful version of Windows in the market. Windows 3.0 was the first version to be widely seen as a rival to Apple's Macintosh and Commodore's Amiga on the graphical user interface (GUI) front. It was followed by Windows 3.1.