Hi there,I have tried to get some a clarification for the SPN to understand why and how Outlook is using different SPNs and how Exchange environment is depends of SPNs. Like how it is finding exchangeAB/myGlobalCatalogServer cause in some cases I have seen on network monitor that it is trying to find exchangeAB/myExchangeServer. Which are the common errors on SPN area. Why I'm not able to find any entries from the workstation which is member of another domain than target servers. And how kerberos is related to SPNs ?-Petri-