http://blogs.technet.com/cliveeastwood/archive/2008/04/27/documentation-update-operations-manager-2007-security-guide-april-2008-update.aspxThe Operations Manager 2007 Security Guide available here has undergone the following changes   New topics in this release: · Using a Firewall in Operations Manager 2007 · Setting up Communications Across a Domain – Workgroup Boundary · How to Seten-USCommunityServer 2.1 SP1 (Build: 61025.2)