A reader points out that, according to the software numbering system Microsoft itself uses, Windows 7 is really Windows 6 rather than, as I calculated, Windows 8.
Windows 95 was Windows 4 and Windows XP was Windows 5. Vista was Windows 6 and, under the hood, this week’s release counts as 6.1 - making it Windows 6 as well.
You can read the full software numbering system here.

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