Exchange-mapi session

how can I find user user4aa0a666?
Any advice regarding event id 9646?
How to troubleshoot?
Event ID-mailbox server
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Hypercat (Deb)Commented:
This is usually a transient error caused by some activity at the client level that opens or tries to crawl or index a large number of objects at one time.  Unless it's persistent and happens a lot you can safely ignore it, as it will go away when that activity stops.

Here's an article about Exchange limits that explains this type of behavior and how it's monitored, and how you can modify the settings if you wish:

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