1.0: 1985
2.0: 1987
3.0: 1990
4.0/95: 1995
5.0/2000: 2000
[significant gap only here]
6.0/Vista: 2007
7.0: 2009
8.0: 2012
Let me correct you.
Windows 1.0 to Windows Me were based on Windows 9x, which was based on MS-DOS.
Windows NT used to be a Business Class Windows Kernel, but since Windows XP, it's been used by everyone.
Let's explain it a bit more clear.
Left = Home users.
Right = Business users.
Windows 1.0 <-> Windows NT 1
Windows 2.0 <-> Windows NT 2
Windows 3.x <-> Windows NT 3
Windows 95 <-> Windows NT 4
Windows 98(SE) <-> Windows NT 4
Windows Me <-> Windows 2000 (Windows NT 5.0)
Windows XP Home <-> Windows Professional (Windows NT 5.1)
Windows Vista HB/HP/Ulti <-> Windows Vista Pro/Ent/Ulti (Windows NT 6.0)
Windows 7 HP/Ulti <-> Windows 7 Pro/Ulti (Windows NT 6.1)
Windows 8/RT <-> Windows 8 Pro (Windows NT 6.2)
Windows 8.1/RT <-> Windows 8 Pro (Windows NT 6.3)
The Windows NT Kernel still hasn't got passed 6.x yet.
Eventually, since Windows XP was NT 5, while Windows Vista was NT 6, it caused a lot of Driver issues to the end users, and since anything after Vista is still NT 6, most Vista Drivers also work on 7, 8, and 8.1.
Also, aside from Windows NT and Windows 9x, there's a third Kernel: Windows CE.
Windows CE is for Smartphones.