Odd numbered releases are unstable... That's a new one on me. Here's one for ya: "If you stand on your left foot when you sneeze, you will not catch a cold."
The release number has nothing to do with the stability of the software. It is just a number.
And, "Windows 1.0" (as far as I know) was the first public release of Windows. I'm not sure the whole history and changes but, it was followed by "Win286" for the new 80286 processor, and "Win386" for the 80386. Then "Win3.0" was released, hearlded as the best OS you will ever see, then "Win3.1" came out as a bug fix.
Then M$ promoted "Chicago" for the next couple years, after that they changed the name to Win93, the next year it changed to Win94, then the successor to win3.1 finally came out. After more than four years of development it should have been perfect. "Win95" the triumph of M$ over.. itself?
Oops! I'm talkin' too much drivel.