I currently have 3 servers in my domain. 2 Windows 2003 servers with AD and 1 Windows 2000 server with Exchange 2000. Can I add another Windows 2003 server to my domain, install Exchange 2003 on it and move my users mailboxes over to it 1 at a time. I have a fairly small network. I want to completely wipe the original Exchange server and rebuild it with server 2003 and exchange 2003 but I need to have my users running off of another exchange server while I am doing that. Any suggestions or advice?