You do understand that Windows 8.1 is actually version 6.3.9600? For that matter, the Windows 7 everyone loved was actually closer to a .x upgrade to Vista. In terms of naming over time, you had 3, 3.1, 95, 98, ME, XP, Vista, 7, 8/RT, and 8.1, not including NT and server variants. Microsoft also completely skipped Office 13. Yes there is Office 2013 which is also Office 365 but that is actually Office 15 which replaced Office 14 (AKA Office 2010) which replaced Office 12. Long and short of it is they could name it Windows Bob and it would be just as meaningful. Quite frankly if they hadn't been so conservative in numbering versions, Windows 10 would have been reached at least one OS ago. BTW, does anyone really think Firefox is version 27 and Chrome is version 34? Version numbers stopped having meaning a long time ago....