Outlook 2013 works differently, but Legacy clients need modifications to server side.
In Exchange 2013:
Create Throttling Policy and apply it to all mailboxes:
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New-ThrottlingPolicy multiplemailboxes Set-ThrottlingPolicy multiplemailboxes -RCAMaxConcurrency Unlimited -EWSMaxConcurrency Unlimited -EWSMaxSubscriptions Unlimited -CPAMaxConcurrency Unlimited -EwsCutoffBalance Unlimited -EwsMaxBurst Unlimited -EwsRechargeRate Unlimited get-mailbox | Set-Mailbox -ThrottlingPolicy multiplemailboxes |
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.