My understanding is that ME from a technological point of view was 98 with NT drivers. It probably was a critical step in getting vendors to make NT drivers for all of their screwball consumer hardware, and this made XP, the "move the consumers to the NT kernel" step a success. The lack of drivers is also what made XP 64 bit edition so fraught with peril, but xp-64/vista was probably critical for win7's success for the same reason.

But yeah, what a turd of a system.