Legato Networker 7.2 Problem

We are using Legato Networker for backup of our servers running Windows 2003 server. the problem is that other clients (especially exchange 2003 server) apart from the server hosting the backup sofware are not backed up. This was working before.

The Administartor is running version 7.2 while the clients are running version 7.22. Could this be the problem?

Someone should please assist.