Question : Exchange 2003 as Backup Domain Controller

Hello, I have a domain controller and want to create a BDC, but the only server available is a windows 2003 standard server that has exchange 2003 installed on it. would there be any problems making this server a BDC?  all comments will be appreciated.

Answer : Exchange 2003 as Backup Domain Controller

In this case, this is not even a question of being recommended or not.
Promoting an existing Exchange server to DC will *break* Exchange.
The only way to install Exchange and AD on the same machine is to first promote the server to DC, then install Exchange.
Accordingly, demoting a DC that has Exchange installed will break Exchange as well.

"You can run Exchange Server 2003 on either a member server or on a domain controller. After you install Exchange Server 2003 on a server, do not change the role of the server. For example, if you install Exchange Server 2003 on a member server, do not use the Dcpromo tool to promote the server to a domain controller. Or, if you install Exchange Server 2003 on a domain controller, do not use the Dcpromo tool to demote the server to a member server. Changing the role of a server after you install Exchange Server 2003 may result in loss of some Exchange functionality and is not supported."

Overview of operating system and Active Directory requirements for Exchange Server 2003
http://support.microsoft.com/kb/822179