What was the worst OS you have ever used?

ME, with 98 and Vista (pre-SP1) close behind.

Btw, Windows ME fun fact:

Wiki said:

Minimum system specifications

• Processor: Pentium 150 MHz
• Hard drive space: 320 MB
• RAM: 32 MB

Recommended system specifications

• Processor: Pentium II 300 MHz
• Hard drive space: 2 GB
• RAM: 64 MB[34]

How far we have come.

ME, 98 & 95 (They were all based on the same Windows 9X kernal). I have no problem with any Windows version that uses the more stable NT kernal, which includes 2K, XP, Vista & 7.

OS/2. Man, was that a PoS...

Another Vote for OS2. ME was a turd..but I never really used it. Was just a money grab from MS.

i would say 3.1 which i never really used tryed it a couple times it was like blah and me i never touched cause most of the time i hear people cursing the damn program

other then that 95,98,xp,vista,win 7 have been alright i t hink best of all with the least amount of bsod was xp and 7 thats just my opinion xp ran fast and smart vista was kinda a headache at first but worked out the kinks

Mac OSX by far.
Very bland, Windows can do whatever the could do. Also lack of customization options - the Mac I used once had only two window colours available - TWO!
Also very boring - what would we be like if there were no tech forums like this if computers never crashed? It takes all the excitement away from using any OS at all!

ME
ran it for 1 day and it was very unstable.

Mac OS X.