Note: This article was originally published in 2008. Some steps, commands, or software versions may have changed. Check the current General documentation for the latest information.
After reading the article: http://technet.microsoft.com/en-us/library/bb124251(EXCHG.80).aspx, particularly the part that states “Depending on whether you have configured the Autodiscover service on a separate site, the Autodiscover service URL will be either (https://%3csmtp-address-domain%3e/autodiscover/autodiscover.xml) or (https://autodiscover.%3csmtp-address-domain%3e/autodiscover/autodiscover.xml).” I decided to create a DNS record for autodiscover and open the firewall so that it could obtain that information. Noteworthy is that you can setup the external URLs for OWA and Active Sync and I believe you use them here.
More Resources:
http://technet.microsoft.com/en-us/library/bb124251(EXCHG.80).aspx
http://technet.microsoft.com/en-us/library/bb430749(EXCHG.80).aspx
Summary
You’ve successfully learned enable autodiscover for outlook 2007. If you run into any issues, double-check the prerequisites and ensure your General environment is properly configured.