By default, the Microsoft Exchange 2007 Management Packs for Operations Manager 2007 will not automatically start monitoring of any Exchange 2007 Servers even if you have imported the Management Pack. This means that the servers won’t automatically show up in the Exchange views in the monitoring section of the console.
This behaviort enables you to start monitoring all your servers immediately, or you can proceed more slowly and enable monitoring of a few Exchange servers at a time.
This article discusses how to start monitoring Exchange 2007 Servers.
To start monitoring of Exchange 2007 Servers, you will need to enable Exchange discovery in the Management Pack (after you have imported it). You do this per server role (CAS, Mailbox, Hub, etc).