Look in MSS Subscriber activity and find out what type of VM msg is in the Vmbx. Also may run OHV to see additional info, but the data in OHV usually doesn't stay for very long. Can this VM be forwarded either to a different mbx or to the same Vmbx? If so, can it be deleted from either Vmbx? Worse case may consider just deleting the Vmbx, WAITING 10 minutes for the FEDB to sync, then re-add the Vmbx. If you don't wait 10 minutes, the FEDB will have extraneous entries that will eventually require a rebuild of the FEDB.