Hi Ed,
The license for Exchange 2000 is backward compatible with Exchange 5.5, but you require a license per database that is backed up using Backup Exec. Please ensure that you have the appropriate number of licenses to backup Exchange. If you are able to see and backup non-Exchange resources on the 5.5 server then there is no issue with the remote agent. Also, you can perform the registry change descreibed in this document on the Exchange Server and media server if the necessary licenses are installed:
http://seer.support.veritas.com/docs/238618.htm
Restart the Backup Exec services and the Remote Agent on the remote Exchange server.
Hope that helps!
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