“Windows” redirects here. For the part of a building, see Window. For other uses, see Windows (disambiguation).
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Microsoft Windows
The latest Windows release, Windows 7, showing desktop and start menu
Company /developer Microsoft
Programmed in C, C++ and Assembly language[1]
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
Official website

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).[2] 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.

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