Microsoft hopes that Windows 8.1 sparks interest in the radically-changed operating system. Users have shown little interest in Windows 8, which at the end of July accounted for about 6% of all copies of Windows used that month to go online, according to metrics firm Net Applications.
That compared poorly to Windows 7, which at the same point in its post-release timeline was powering 17.3% of all Windows systems.
Microsoft did not immediately reply to questions about Windows 8.1's availability on MSDN.
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