Increase the maximum MAPI session limit from 32 concurrent to 5000 concurrent

Outlook 2013 works differently, but Legacy clients need modifications to server side.

In Exchange 2013:

Create Throttling Policy and apply it to all mailboxes:

Then add registry key (below is for 5000 concurrent connections):
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeIS\ParametersSystem]”Maximum Allowed Sessions Per User”=dword:00001388
Then restart Information Store service.
Author: Harri Jaakkonen

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