What happened to Windows 4, 5, 6, and 9?

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Other answer:

There were Windows XP, Windows ME, Windows 2000 instead of Windows 4,5,6. Microsoft skipped Windows 9 and went for Windows 10.
they either never existed, or were prototypes/development OS'
1.win 1 – 3.1
2. win NT
3. win 95
4. win 98
5. win 2000 /ME
6. win xp
7. win vista
8. win 7
9. win 8 /8.1
10. win 10
Microsoft doesn't use a numerical sequence naming convention so there is no way to predict what their OS will be named. Example they went from Win 3.1 to Win 95 to Win NT 4 to Win 98 to Win 2000. So where is Win 96, 97 or Win 99, 100, 101, 102, etc up to Win 2000. This is why we, as the general public, can't predict names of their OS. Another example, Vista was originally named Longhorn and was supposed to be called Blackcomb and some of the programmers were even referring to it as Whistler during production. Point being, what the programmers decide to ultimately call the OS when its released cannot ever be predicted because it's not based upon any type of number or name sequence.
They ran on the Digital Equipment PDP-2, PDP-3, and PDP-13.
Survival of the fittest.