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Windows 8.1 is a personal computer operating system that was produced by Microsoft and released as part of the Windows NT family of operating systems. It was released to manufacturing on August 27, 2013, and reached general availability on October 17, 2013, about a year after the retail release of its predecessor. Windows 8.1 was made available as a free upgrade for retail copies of Windows 8 and Windows RT users via the Windows Store.
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