Thanks in Advance, I had a windows 2000 domain, I had the Primary DC and a Exchange Server 2003 enterprise running on Windows 2000. However I added new 2003 DC and Backup, Once everything transferred I demoted the 2000 servers to be Members. However when we Demoted the Exchange Server it removed the Active Directory user and Computers. therefore I can't create new exchange mailboxes etc. Not sure what to do. However I can use the MMC snap in and add the Active Directory and Users, But it doesn't have the capability to create Exchange Mailboxes. Exchange server works and there is a Exchange Connector, But nothing else. I don't know how to get that back?