http://support.microsoft.com/kb/961655
In server 2003 R2, if the DFS member server is deleted and re-added to the DFS replication group within a 30-day period, the tombstone flag will be deleted and problems can ensue.
In server 2008 R2, is this tombstone value still 30 days?
If the replication group is deleted, and dfrs.db file gets deleted on each former member, can a replication group be recreated with any member servers without worrying about tombstone issues?