IMAP access from MAC's to Exchange 2000

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Guys a question for you re IMAP.

We have a server (Exchange 2000 sp3 August 2004 Post SP3 Roll-UP with
mirrored 36.gb disks and 2Gb of ram) in our org in a site with around local
30-40 clients. About 5-10 of these are Mac's.

When the mac clients access their email (via IMAP using mail.app) the server
performance falls through the floor. If the Mac's access their mail any
other way all appears to be fine. I am in the process of trying Entourage
2004 on their machines but as this is a pay for client they are reluctant to
spend the cash when they have a free mail client built into the OS.

I have run performance monitors on this server and when I look at the
physical disk read/write queue length (scale set to 10) I can see as soon as
one of the Mac's sync the levels go from around 1-2 to over 30 and sometimes
even over the 70-80 mark. When this happens the PC users the get the
"Requesting Data from server" outlook message and as they are using Outlook
2002 they then cannot do anything. If we stop the IMAP service all returns
to normal.

One thing I have noticed though and wondered if someone could explain is
that when I look in exchange system manager under the IMAP default virtual
server current sessions I see the clients end up with multiple current
sessions, why is this ? Surely there should really only be one session if
they are logged on from one MAC and nowhere else ?

We have not configured anything odd, just started IMAP service and left at
defaults. We have been looking at this for a while and it is now driving us
mad !

Any help or advice on where to go (other than to upgrade to Entourage) would
be most appreciated.

Cheers
Marc Cronin


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