Hello,
The newer agent can cause problems with the older software. It is recommended to have both the remote servers and the backup exec media server in the same version.
You could thus upgrade the media server to backup exec 10d which is a free upgrade from 10.0. You can then use the 10d agents. Refer to the following link where you will find the files for upgrade to 10d. Just run the upgrade above the curent installation:
Symantec Backup Exec (tm) 10d rev. 5629 for Windows Servers Installation Files
http://support.veritas.com/docs/279332
Note : If we do not receive your reply within two business days, this post would be marked �assumed answered� and would be moved to �answered questions� pool.
Regards.