Microsoft Windows is a family of proprietary operating systems most commonly used on personal computers. It is the most common family of operating systems for the personal computer, with about 90% of the market share.Currently, the most widely used version of the Windows family is Windows XP, released on October 25, 2001. The newest version is Windows 7 for personal computers and Windows Server 2008 R2 for servers.
Microsoft Windows originated in 1981 as an add-on to the older MS-DOS operating system for the IBM PC. First publicly released in 1985, Windows came to dominate the business world of personal computers, and went on to set a number of industry standards and commonplace applications. Beginning with Windows XP, all modern versions are based on the Windows NT kernel. Current versions of Windows run on IA-32 and x86-64 processors, although older versions sometimes supported other architectures.
Windows is also used on servers, supporting applications such as web servers and database servers. In recent years, Microsoft has spent significant marketing and research & development money to demonstrate that Windows is capable of running any enterprise application, which has resulted in consistent price/performance records (see the TPC) and significant acceptance in the enterprise market. However, its usage in servers is not as widespread as personal computers, and here Windows actively competes against Linux and BSD for market share, while still capturing a steady majority by some accounts.
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