Microsoft Windows is a series of operating systems produced by Microsoft.
Microsoft introduced an operating environment named Windows on November 20, 1985 as an add-on to MS-DOS in response to the growing interest in graphical user interfaces (GUIs). Microsoft Windows came to dominate the world's personal computer market, overtaking Mac OS, which had been introduced in 1984. As of August 2011, Windows has approximately 82.58% of the market share of the client operating systems according to Usage share of operating systems.
The most recent client version of Windows is Windows 7;
the most recent server version is Windows Server 2008 R2; the most recent mobile version is Windows Phone 7.
the most recent server version is Windows Server 2008 R2; the most recent mobile version is Windows Phone 7.
