>>90
Windows: 5: 98, NT, XP, Vista, Win7
Mac: about 3: OS 8, OS 9, OS X (and some later versions I cannot be assed to recall)
Linux: 5: Slackware, Debian, Mandrake, Arch, Ubuntu
Unix: 2: FreeBSD, Haiku
So, 15.
>>92
What are you most favorite/hated operating systems?