umm I went from Vax vms to CPM to dos 3.3 IIRC vs 4 was awful - buggy as hell 5 was better and 6 befoe starting seriously on windows 3.0 a right PITA 3.1, 3.11, 95 ... at some point I think about windows 95 - millienium (didn't have) dos disappeared up to 95 it was still there as vs 7 I think. Were you asking about MsDos or Dr Dos???