I recently installed Exchange 2003 on a Win2003 server; I also have a second Win2003 server on the LAN with AD. Last year I used to have a 3rd domain controller running Win200 server, but this computer was eliminated. This used to run Exchange server 2000, but it was eliminated about a year ago. When I recently installed Exchange 2003 on the Win2003 server, it picks up the old computer that was eliminated last year and it places the main mailboxes in this non existent computer. Furthermore, it does not pick up the second domain controller, which really exists. What is wrong? All 3 domain controllers had different names and one is not even on the LAN any longer!