Well I screwed the pooch good and proper on this one. I installed a 20 user CAL and then formatted the server. I have a backup, but apparently it was taken before I used the code. Now that I have reinstalled 2008, it says the CAL code is already used, and I can't find a way to reactivate it (which is part of the point, I'm sure). We got this as part of our MSDN subscription. I suspect that we are just going to have to bite the bullet and ask Microsoft to give us a new code or reactivate the old one. Any advice is appreciated.