[tinus_hn]

Different versions have in fact leaked, most recently of Windows XP/server 2003.

[userbinator]

Oddly enough, all the Windows leaks I've heard of are various versions of the NT series --- I don't think I've ever heard of Win9x (and 3.x) leaks.

There's some very old DOS leaks too, but the "in between" seems to have somehow been avoided.