http://blogs.technet.com/wchomak/archive/2009/01/08/interoperability-sp1-and-r2-consoles.aspxThe consoles are version specific and therefore you won't be able to connect to a R2 management group with your SP1 console unless...... The following information courtesy of Michael Pearson: 1. Create a folder for ManagementGroupSessionManager if there’sen-USCommunityServer 2.1 SP1 (Build: 61025.2)