We recently installed Exchange 2007 SP1. We have 2 mailbox servers and 1 CAS server. The CAS server has 2 gig, the others have 8 gig of memory. 600 clients with most using Web client. Have some, maybe 50-75, users using imap in thunderbird. Imap service is at 100%. Is there a problem with the Imap protocol? Generally have to restart the service to clear it, but after a while it climbs back to 100 % cpu. I heard there was a fix for this in rollup 5 for the RTM release and that it should be in the SP1 release.
