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

I faced this error very long and my solution ended with below tweak.

This is solution which also works for Exchange 2010.

Simply open registry editor.

Locate folowing reg entry

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeIS\ParametersSystem

create Dword-32bit entry.

"Maximum Allowed Sessions Per User" to some decimal value

Restart Microsoft Exchnage Information Store service.