http://blogs.technet.com/alipka/archive/2008/07/16/new-6-0-6278-12-e2k7-opmgr-mp-discovery-and-rule-bugs.aspxThe just released E2k7 MP has two important bugs in it. I communicated this to the product group, and they are working on releasing a fix. Meanwhile workarounds are (thanks to Ake for quick response to this): 1. Discovery discovers E2k3 clustered backenden-USCommunityServer 2.1 SP1 (Build: 61025.2)