OS/2 was the best single-user OS ever written. I could print while downloading while formatting a floppy and it wouldn't miss a beat. Despite having an incredibly sophisticated UI that puts modern session management to shame it looked like an 8th grade class art project. And it was all sold by a company of brilliant engineers whose marketers couldn't sell water in a desert, all while Microsoft made the world want more sand.
Warp, you are missed.
CP/M Forever
True that. 2.2 for the record. None of that newfangled 3.0 crap with timestamps and what not.
Kildall ruled.
Ngl, the sheer number of lockup and freezes that I experienced drove me straight into the arms of Linux.