I think I might try the Linux route after I get everyone settled into the new system. I'm on a deadline of getting this in place by the end of the day Tuesday. I thought I had it squared away until I realized I had a mess with the 10 user limit. I'm switching everyone to IMAP this weekend because I refuse to send more money to micro$oft. The reason I asked about the shared folder in the earlier post is because I didn't need to log into the xp machine to view the archive folder over IMAP.
For now it looks like I'm going to manually administer the individual addressbooks on a per client basis. Being only 20 local users it won't be that bad. Maybe this could be added to a future version. When you create an address book, have the ability to browse to a shared version. Luckly we don't have a heavy turnover.