IMAP Service taking %100 cpu

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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.


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