I need some assistance understanding Autodiscover. I'm not sure what to set the ExternalUrl to for this cmdlet. For now I set to https://exchange.mydomain.com/autodiscover/autodiscover.xml Is this correct in any way?

A little clarification for my exact problem:When I click "Test E-mail Autoconfiguration" within Outlook 2007 it only finds POP3 on 110, and SMTP on ports 25 and 587.I'd like Autodiscover to find Exchange HTTP, but I'm lost as to how to properly configure the server to do this.