Has anyone tested this in coexistence with 2007 yet? We are in the middle of a 2007-2013 migration but cu6 databases fail over so frequently that it has got to the point where we can't move any mailboxes in or out of 2013 databases as they failover before the move has completed and users are starting to complain about the disconnections in outlook. So we might have to bit the bullet and install. We tried the interim update from Microsoft but had loads of missing files in OWA so reverted back to cu6.