Why Windows 10 isn’t version 6 any more and why it will probably work
A long-standing oddity of Windows is that its branded number has for some years now not matched the version number stamped into the kernel and other parts of the operating system. Windows 7, for example, reported itself to software as being version 6.1. Windows 8 is 6.2, and Windows 8.1 is 6.3.
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Story added 24. November 2014, content source with full text you can find at link above.