Dunno if you have seen these errors on an Exchange 2003 server ..
Event ID: 9646
Closing Mapi session “/o=Organization/ou=Administrative Group/cn=Recipients/cn=user” because it exceeded the maximum of 250 objects of type “objMessage”.
KBs for this:
Been playing with the figures and couldn’t for the life of me workout if it uses the Hex or Decimal values …. it appears it uses the decimal ;-)