Wasn't MS-DOS 4.0 the buggiest version ever? I seem to remember that it was withdrawn almost immediately in favor of 5.0. Maybe M****S*** released the source so that young programmers would learn how not to code!
@cenbe I certainly remember everything >= 4 being shit. Anyone who needed to get stuff done stuck with 3.3x and 3.2x had its fanbois.
I knew one IT manager guy for part of a large public service who preferred dos 2