Hi There, I am planning to deploy Exchange 2007 with ISA 2006, the ISA server will be placed at the DMZ. Since certificate must be used in Exchange 2007, but the external URL to my server will be different from my server name, e.g. URL = https://webmail.abc.com with the server name Exchange2007.abc.com. How do I setup the whole infrastructure in order to ensure user won't receive certificate error prompt, if some of my users are going to use Client Anywhere feature? Should all internal LAN trafficusing Client Anywheremust routeto the ISA external(internet) port and throught the ISA server back to my Exchange 2007 server? Also, is there any concern with the new Autodiscovery service? My friend got some experience that they don't receive any certificate error for all Exchange HTTPS traffic except they also receive an ceritificate error for autodiscovery service. Thanks in advance!