Active Directory Management Pack: which ones to import

The latest Active Directory Management Pack package includes management packs for monitoring Windows 2000 Server, Windows Server 2003, and Windows Server 2008. Each server version has a .Discovery management pack and a .Monitoring management pack. You may decide that, since you're only monitoring Windows Server 2003 (for example), you won't bother importing any of the other server version management packs, only to have a problem because Operations Manager tells you that you're missing some required management packs -- what's going on?

Even if you are only planning to monitor one server version of Active Directory, you must still import all three .Discovery management packs. The monitoring management packs require all three discovery management packs to support the workflow for replication monitoring.