OCS 2007 R2: Error with Group Expansion

Our OCS client gave an unknown error when trying to expand Distribution Groups. After lots of searching I found this http://blogs.technet.com/greganth/archive/2009/03/26/office-communicator-error-message-received-when-expanding-a-group-distribution-list.aspx.

After trying this we still had the issue. So after finding out that you can test groupexpansion when connecting to the DG URL from the OCS server itself (localhost), I got an error message.

There still was a problem with rights and probably with impersonation. I found out the application pool was using the RTCComponentService instead of IIS_WPG. Giving RTCComponentService impersonation rights fixed it!

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