Exchange 20xx - Verbindungslimit setzen:

Fehler im Eventvwr:
Mapi session /o=xxx/ou=Exchange Administrative Group (xyz/cn=Recipients/cn=usernamewith client type MoMT exceeded the maximum of 32 objects of type Session.

Registrierung öffnen
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeIS\ParametersSystem 

Neues DWORD32-Wert erstellen --> "Maximum Allowed Sessions Per User" = 500

Dienst "Microsoft Exchange Information Store" neu starten