They're kind of all over the map, really, but the average seems to be 3 years for most (though I only counted consumer OSes, and I left Windows NT 3.5 and 4 ...
The NSA's previous involvement with Windows Vista, their advice with regard to the security in Windows XP/2000, the “Clipper” chip that would allow them to ...
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Windows NT is a family of operating systems produced by Microsoft, the first version of which was released in July 1993. It was originally designed to be a ... en.wikipedia.org
Windows NT 3.1 is the first release of Microsoft's Windows NT line of server and business desktop operating systems, and was released to manufacturing on 27 ... en.wikipedia.org
Microsoft Windows family of operating systems home page with product information , edition comparison charts, feature descriptions, downloads and more. www.microsoft.com
Helping you with questions you may have about Windows NT. www.computerhope.com