Small Business Dictionary

Microsoft Operating System

The Microsoft Operating System is the world’s most popular software and graphical user interface (GUI) to run computers. Launched as DOS in 1975 and as Microsoft Windows in 1985, it evolved to Windows NT, Windows 95, Windows 98, Windows 2000, Windows XP, and Windows Vista, and is now available as Windows 7. The Microsoft Operating System runs approximately 90% of the world’s computers.