Mailbox users using 79% of the MAPI CPU on my Exchange server
Posted on 2012-09-21
I have an Exchange server 2010 running with Servicepack 2, with rollup 2. After we migrated the users from MDeamon to Exchange 2010, I get very high network traffic and tons of logfiles is written on one specific mailbox database.
I see there is 6 users, causing this. I tried to setup their Outlook client again, but still I see very high network load on the server during a workday. If they shut down their computers, everything goes to normal.
I tried to use Exmon to see which users are causing this, and I found three so far. But I can hardly see the other three which the performance troubleshooter under toolbox shows on my Exchange server. It says:The top 6 users account for 79% of the MAPI CPU usage on the server.
What can be the cause of this? The problem seems to be only in the main workhours, could it be some calenders thats causing this? Because when migration from Outlook Connector on MDeamon, we also imported all calendars and contacts.
Would be great with some tips and how I can narrow down these six users causing this heavily load on my exchange server.
Thanks in advance.