The latest Windows release, Windows 7, showing desktop and start menu
|Programmed in||C, C++ and Assembly language|
|OS family||Windows 9x, Windows CE and Windows NT|
|Working state||Publicly released|
|Source model||Closed source / Shared source|
|Initial release||November 20, 1985; 26 years ago (asWindows 1.0)|
|Latest stable release||Windows 7, Windows Server 2008 R2
NT 6.1 (Build 7601: Service Pack 1) (February 22, 2011; 15 months ago) [±]
|Latest unstable release||Windows 8
NT 6.2 (Build 8400) (May 31, 2012; 25 days ago)[±]
|Marketing target||Personal computing|
|Availablelanguage(s)||Multilingual (listing of available Windows 7 language packs)|
|Update method||Windows Update, Windows Anytime Upgrade|
|Supported platforms||ARM, IA-32, x86-64 and Itanium|
|Kernel type||Hybrid (Windows NT family), DOS (16-bit Windows and Windows 9x/ME series)|
|Default user interface||Graphical (Windows Shell)|
|License||Proprietary commercial software|
Microsoft Windows is a series of graphical interface operating systems developed, marketed, and sold 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.
The most recent client version of Windows is Windows 7; the most recent server version is Windows Server 2008 R2; the most recentmobile version is Windows Phone 7.5.