IMAP Service taking %100 cpu

[KevCar]

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.

[MarjanRepič]

Hi all,

We have the same problem on Exchange 2007 sp1 updated, some users are have more then 700.000 messages "Items in folders".

The problem is, when a user click on folder witch have a large numbers of items in folder such as 700.000
or run some filtering or rule-ing, then Microsoft.exchange.imap4.exe service load 100% CPU on our quad-core maschine, and you must restart the service.
The latest Roll Up and updates in our organization not solve the problem.

If you whant to check how many items have some users, you can simply open the exchange management shell (Powershell) and type;

Get-Mailbox | Get-MailboxFolderStatistics | Where {$_.ItemsInFolder -gt 20000} | fl identity, itemsinfolder
This will prompt any user in your org, that have more than 20.000 items in any folder, trash, inbox,...

You will get something like that;

Identity : yourdomain.local/Users/Sales/Franz Kafka\Inbox
ItemsInFolder : 35851

Identity : yourdomain.local/Users/Sales/John Derre\Trash
ItemsInFolder : 50851

and so on...

This affect mostly IMAP users not MAPI based clients.
More than 40.000 - 50.000 items is problem in our exchange organization.

You can limit this by some policy of folders,...

Also exmon is very good tool for exchange mailbox server role.
http://www.msexchange.org/tutorials/Microsoft-Exchange-Server-User-Monitor.html
With exmon you can check in real time witch user is getting a lot of % cpu...

I hope anybody will get something of that, sory for my english.

Marjan Slovenia

KevCar wrote:

IMAP Service taking %100 cpu
17-Jan-08

Previous Posts In This Thread:

On Thursday, January 17, 2008 5:01 PM
KevCar wrote:

IMAP Service taking %100 cpu

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