You have two choices for publishing auto discovery, you can use a public DNS A(host) record named 'autodiscover.domain.com' which points to the same WAN address as 'remote.domain.com' or you can use a DNS SRV record. The A(host) record is on the face of it, a simpler method. Your DNS admin need only create a simple DNS entry, and your off and running. The SRV record I think may be a stumbling block for many a SBS admin – with the issues some ISP's and DNS hosting companies seem to have with a simple SPF key – who knows the results we will see when we ask for SRV entries! Following the advice in Eriq Neale's 'SBS 2008 Unleashed' you can read that if you register your domain name using the built in SBS wizards, using one of the approved registrars, SBS will create all the required DNS records for you. Obviously this won't suit all of us as we will already have a public domain name. So, you have to make your decision, because you can't use both methods. This Microsoft article will explain more: http://support.microsoft.com/kb/940881 . For those of you who don't want to read the MS article here is a brief description of the AutoDiscover process and possible problems you may encounter. When you run the Outlook account wizard, you are presented with the page; 'Auto Account Setup' and you must fill in your name, email address, and password. Clicking on Next will start the auto discovery process. Outlook now tries to connect to some predefined URLs: /Autodiscover/Autodiscover.xml">/Autodiscover/Autodiscover.xml">https:///Autodiscover/Autodiscover.xml /Autodiscover/Autodiscover.xml">/Autodiscover/Autodiscover.xml">https://autodiscover./Autodiscover/Autodiscover.xml /Autodiscover/Autodiscover.xml">/Autodiscover/Autodiscover.xml">http://autodiscover./Autodiscover/Autodiscover.xml If one of these URLS is valid, Outlook will continue on the AutoDiscovery process. If you are running AutoDiscover over SSL your outlook client will now be prompted to accept a certificate warning, before continuing. This is because we are connecting to 'autodiscover.domain.com' instead of 'remote.domain.com' which is the domain our SSL Certificate is valid for. If we use A DNS SRV record, which is new for Outlook 2007 ( http://support.microsoft.com/kb/939184/ Description of the update rollup for Outlook 2007: June 27, 2007) we avoid this certificate warning altogether. The SRV record tells our Outlook client the AutoDiscover service is available via our 'remote.domain'.com' WAN address. Your SRV record will look similar to this ' _autodiscover._tcp SRV 0 0 443 remote.domain.com. ' The actual publishing methods are very similar, however if you want to use the SRV record make sure you do NOT have any public DNS records that match the predefined auto discover URL strings, or your Outlook Client will not search for the SRV record.