Was he though? This is someone speaking from the outside, with fuzzy memories of release dates, but I'm pretty sure Windows (excepting NT) didn't have preemptive multitasking until 2000, and I think OS/2 was out before NT. I still have fond memories from the late 90's of a friend who adminned Windows and had a CD for when someone would set the password on the screensaver on the Windows boxes: the CD had an autorun that would pluck the password out of the registry and put it in the clipboard so you could paste it into the password box (no memory protection). That and the memory shotgunner: a program that would write random data to random memory addresses. No Windows machine would stay up for more than about 5 minutes running that, while Linux would kill the program and merrily continue on its way. Or the packet of doom to lock up Windows remotely.