I am running Windows 2003 Server SP1 on three servers. One is the PDC, another is running Exchange 2003. The Exchange Server has suffered catastrophic failure and is off. We installed Exchange 2003 on the other server that is not the PDC and it installed fine. However, Active Directory is showng that users already have mailboxes. I guess this is because the mailbos store still points to the original Exchange server that is now off. Is there any way, without turning on the original server, that we can get the new Exchange installation to host the mailboxes? Or is there a way to undo the Domain prep and forest prep of the original installation and install Exchange from scratch?