Well, that's a loaded question.
My office officially uses 2k4 ADT, ...
However, we are currently on the board when it comes to drafting, currently at v14 when it comes to toolbar commands and such and constantly saving files to 2000 because everybody we share with is using 2000 or 2002.
I've tried reasoning with them (my office coworkers), tried forcing them, tried coercing them and I've even tried bribing them.
They say, "If you can't beat em, Join em". That's the only thing I haven't done yet, ... BEAT them.