Since we have replaced our mail server(nt4,exch5.5) with a new PC (Win 2K, Exch 2K), Backup exec can no longer backup mailboxes. The new server has the same name and IP as the old one had. I have deleted the bewinui file and let it recreate, copied the mapi32.dll to the Backup exec directory, run fixmapi, re-installed the exchange client, installed the remote client on the new mail server, etc. If I go into backup selections, when I try to select Exchange Mailboxes, it keeps asking for a unique exchangr mailbox name. I've tried mine, the previous LAN admin's, the backup exec mailbox name, administrator, none will attach. Thanks for your advice!!! Rlee@ncdoi.net