We have a native Exchange 2007 deployment. We are currently undertaking a migration to 2013 and we're doing some housecleaning in anticipation of that.
When the environment was moved from 2003 to 2007 the last 2003 server was apparently not gracefully removed, and I think it has left some artifacts, specifically the First Administrative Group. I see this in two places:
1. In ADSIEdit under Services --> Microsoft Exchange --> %company% --> Administrative Groups
2. In Public Folder heirarchy under \NON_IPM_SUBTREE\SCHEDULE+ FREE BUSY
No servers are listed in that group in ADSIEdit, and all of the old Exchange 2003 servers have been long removed. I recall that the last 2003 server in the organization had issues during uninstall, and it eventually crashed and could not be revived. At that point the only thing it was being used for was as a connector for Lotus Notes, which was being phased out anyway.
At any rate, is there any downside to manually deleting the First Administrative Group from the Configuration container and from the \NON_IPM_SUBTREE\SCHEDULE+ FREE BUSY Public Folder?