Win2k classic interface remained my Win interface until I stopped maintaining a network for a charity and thus didn’t work with with Windows anymore.
2k was awesome, especially SP4. I still have much love for Win2k.
Ask anyone who tried to setup a modem under Win 95...
Configuring a modem was one of the most challenging elements under NT4.0 too, especially if part of a PBX board. Took me almost two complete days to get things going properly!