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Tag: Event ID 9646

In your Exchange 2016 environment, you might have noticed the following Event (Event ID 9646) being logged: Mapi session (redacted) with client type MoMT exceeded the maximum of 32 objects of type Session To resolve this issue, you can create a registry key on the server and then restart the Exchange Information Store. HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeIS\ParametersSystem\Maximum Allowed […]

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In Exchange 2010, you might come across the following error message logged consistently in the event log for a mailbox: Mapi session exceeded the maximum of 250 objects of type “objtMessage” The best option will be to investigate outlook add-ins or AV or something scanning the mailbox on the machine. Take note this will affect […]

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