Thanks, this is a great deal. Seems like they have good prices on a lot of other sw, too. I ordered mine last friday and got it yesterday, so pretty responsive service, but I live in NY, which is fairly close to their base in OH. It shipped first class mail, so depending on where you live it might take a while to get it.
I installed this over a version of NAV Corporate edition without any problems - simply didn't install NAV2002. I'd heed maxcom's advice, though, seems like it could be problem if you try to force your way over the warnings of the installer.