Hi, everyone! Starting a new thread because I can't seem to find a solution over the past years' worth of posts on this topic. Environment is an Exchange 2010 SP3 (RU7) stand-alone server running under Win2k8 R2; client is Windows 7 Pro running Office/Outlook 2k10.
Regularly, a single user account is causing the error "MAPI session -x- exceeded the maximum number of 250 objects of type 'objtMessage'" in the Exchange logs.
First, this error is occurring regularly (ie, several times a day) for this one single account; once every blue moon well see it for another account, but this one account causes it regularly.
Second, I don't want to create the MaxObjsPerMapiSession key (https://social.technet.microsoft.com/Forums/exchange/en-US/91922b60-38b7-4af3-ba13-3b44949cc9f7/event-9646-msexchangeis-mapi-session-exceeded-the-maximum-exchange-2010-sp1-w-update-roll-up-2?forum=exchange2010
) specifically for this one single user, given that I've read a couple articles on Technet indicating that high values here may cause performance issues. Doing this for one single user in a large user base seems like a band-aid approach and not solving the problem.
Third, the physical client machine has recently been replaced and the issue is still occurring. There are no viruses/malware on the machine in question.
How can I track down the CAUSE of this issue? Is there a specific metric I can watch on Exchange for this user account to get an idea for how quickly the thread counts are being consumed, or how many processes are being launched for this user? Any diagnostic I can run against the mailbox/account?
Any productive suggestions would be appreciated, but I'm more interested in finding and resolving the cause of the problem than ramping up an error threshold (which does nothing to solve the underlying problem).