Hi, If I have a split DNS which one should autodiscvoer be used for i.e. I have an external domain of external.com and and internal domain of internal.local. My users email and sip names are external.com and my cas server is connected to internal.local domain. When configuring the autodiscover service on my internal network should I set it up as autodiscover.domain.com or autodiscover.internal.local? ThanksCeltic

Hello, From the internal network the clients will connect to the SCP and will not use DNS. So what you need to do is to configure the SCP as you like, DNS is not involved here . DNS comes into play when dealing with external clients. You configure the SCP by a command of this type: Set-ClientAccessServer -Identity "CAS-01" -AutoDiscoverServiceInternalUri "https://cas01.contoso.com/autodiscover/autodiscover.xml" -AutoDiscoverSiteScope "Mail" So there is no need to configure the DNS. The only situation where you will need the DNS is if you want to provide a fallback mechanism in case the SCP is not accessible. In that case you will need in your internal DNS a record of the type autodiscover.internal.local that should point to a CAS server IP. More info about this in http://msexchangeteam.com/archive/2007/04/30/438249.aspx ( ceck out the other great links on this topic contained in the article) Hope it helps, Mihai