[EXCH2013/16] Mapi session exceeded the maximum of 32 object

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[EXCH2013/16] Mapi session exceeded the maximum of 32 object

Postby darkwiz » 28 Sep 2017 15:13

Mapi session exceeded the maximum of 32 objects of type "session"

The number of server-side objects that are allowed by clients is limited to prevent a single client from the exhausting resources on the Exchange server.

To resolve this problem:

1. Open Registry Editor and navigate to: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\MSExchangeIS
2. Right click ParametersSystem and create New -> DWORD
3. Enter Maximum Allowed Sessions Per User and confirm
4. Right click newly created key, create new DWORD value called objtFolder and give it a decimal value bigger than default 32

There's no need to restart Exchange server or even MSExchangeIS service. Give it some time and things will settle down. You might need to restart Outlook client to start synchronising folders again.
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