heh, I've been talking about network edition for so long to my bosses that I forgot about the free version...
I guess the worst I could say is "if you're so ready to get rid of it, maybe a free solution would be better... " and then I can ninja-sneak zimbra in to the network.
(we're currently MS Exchange 2k3, and migrating to 2k7 over the summer, despite my arguments to the contrary considering we're a 90% OSX campus...)