A while back, either here or on iwethey interactive, I implied that Exchange 2k had a "hidden" SQL server backend.
I just found out that it actually is still using the Jet engine, with some SQL Server technology thrown into the mix.
"He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche