Have you used those OSs?
Yes....All of them (as of part of my job for many of them)...ages me slightly
10. VMS (Animal Feeds Software Development)
9. DR Concurrent/Multi-User Dos (Weighing systems software dev)
8. Windows XP (my job now systems admin)
7. Amiga OS 3.9 (Can't say 4 never seen it live)
6. Unix System V (Process control/weighing)
4. Mac OSX (Fun)
3. Debian (Ubuntu or Debian itself I use all the time these days)
2. CP/m (all flavours including CP/m 86)....Again animal feeds systems.
1. Windows 2003 R2 (work with it every day)
I didn't include others I've worked on , RSX (Pile of pooh), Xenix (fun but tosh), MSDOS 1 to 6.22 gave me my career a start but stopped my development side by Windows 95 (wasn't any good with Objects, only in recent years have I started to get my head round them).
Also didn't include purely rom bases OS's i.e Vic20/Pet and 64 Basic was good for teaching me basic in the first place.
Top 10 Crap Os's are
10. RSX
9. Xenix
8. OS Warp
7. OS/VS1 (But to be honest this was the first true OS I had ever seen and came on a handy 8inch Floppy inserted into a box the twice the size of a large filing cabinet)
6. Windows 3.1 (not really an OS i know)
5. Gem (Same again I know its not an OS)
4. Novell Netware
3. Kickstart 1.2 (buggiest thing I've ever seen Guru'ed me to give up and stuck to play games)
2. Solaris 2 onwards....could they have just stuck to system V and not mucked it up
1. Windows 2000 (Without exception the most unstable / Vunerable / worst OS I've ever seen and we still use it.....dam those tie in contracts)