On a server that is running Microsoft Exchange Server 2003,
Event ID: 9646
Description:
Closing Mapi session "/o=Organization/ou=Admini
strative Group/cn=Recipients/cn=Rec
ipient" because it exceeded the maximum of 32 objects of type "session".
I found this on the KB -
http://support.microsoft.com/kb/842022 but it did not help. How can release these sessions and figure out what caused them?