Microsoft's Counting

I have encountered many versions of MS Windows, and have heard tell of even more, so I decided to work out how many.

In the early days there was a simple numbering, Windows 1, 2 and 3.

Then it became more complicated. I recall the following:

(4) Windows 95
(5) Windows 98
(6) Windows 2000
(7) Windows Millennium Edition
(8) Windows XP
(9) Windows Vista
(10) Windows 7
(11) Windows 8
(12) Windows 10

Did I miss a Windows 9 ?