[Frank Castle]

Getting hammered with this right now. Anyone else dealing with this with Exchange 2007?

Event ID 9646 is logged in the application event log of your Exchange Server 2003 computer when a client opens many MAPI sessions

[Mikey_AGBoston]

I got beat with this in my new Exchange 2010 / BES 5.0.2
Could not activate users, until I called Microsoft, and they gave me: KB 842022, and I increased the MAPI session:
DWORD: Maximum Allowed Sessions Per User = DEC.128

Event ID 9646 is logged in the application event log of your Exchange Server 2003 computer when a client opens many MAPI sessions