Re: Windows 10 did especially well
"the Japanese don't like the way Nine sounds cos it's similar to their word for torture or suffering."
9 = 'kyuu' - which can imply 'sudden' if I read the japanese/english dictionary correctly. I'm not an expert, but I know THAT much at least. (granted, the Japanese language has a LOT of homonyms in it, which is I think why they still use Kanji for writing, because it disambiguates things well).
Another rumor I heard is that '9' sounds like 'Nein' in German, which of course means "no". (ironically 'no' in japanese is 'iie' which sometimes sounds like "Ja" which means 'yes' in German).
The most likely skip of '9' is that '10' implies "completion" from a numerological standpoint, primarily because "count to 10" and we have '10 fingers' and other things LIKE that which are common to the human experience. So MS used the TAROT for their inspiration for "10" ha ha ha ha ha ha ha.
No, seriously, the Windows '9x explanation is PROBABLY the best one. To avoid confusion with past, SUCCESSFUL versions of Windows, of course, since Win-10-nic is a PURE ABORTION when it comes to everything in it.