Windows 7 is a personal computer operating system developed by Microsoft, a version of Windows NT. Development of 7 occurred as early as 2006 under the codename "Blackcomb". Windows 7 was released to manufacturing on July 22, 2009,[6] and became generally available on October 22, 2009,[7] less than three years after the release of its predecessor, Windows Vista. Windows 7's servercounterpart, Windows Server 2008 R2, was released at the same time.
In contrast to Vista, Windows 7 was generally praised by critics, who considered the operating system to be a major improvement over its predecessor due to its increased performance, its more intuitive interface (with particular praise devoted to the new taskbar), fewer User Account Control popups, and other improvements made across the platform. Windows 7 was a major success for Microsoft; even prior to its official release, pre-order sales for 7 on the online retailer Amazon.com had surpassed the record set by Harry Potter and the Deathly Hallows. In just six months, over 100 million copies had been sold worldwide, increasing to over 630 million licenses by July 2012, and a market share of 47.49% as of February 2014 according to Net Applications, making it the most widely used version of Windows.
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