Just to be sure move those files then take the database off line and run eseutils on it. Then remount, if that is fine then do a full restart of the server. If possible offload the files to tape of external hard drive just in case.

If your exchange store is getting to that size I would recomend upgrading to exchange 2003 w/ SP2 as it now has a 73-74gb limit on the database.

But for the moment if possible why not exmerge some of the old mailbox's and impose limits on mailbox's? or write an article for your users on how to auto archive old items to a network folder for later backup?

Memnoch