We have started installing Outlook 2007 on a small network with Exchange
2003. We are starting to get certificate warnings about
autodiscover.mydomain.com, but we simply want to stop Outlook from
autodiscovering anything. How do we turn this off?

Autodiscover seems to be largely a waste in our case. Not only are we are
more than capable of typing in the server name (quicker than setting up or
troubleshooting autodiscover), but Outlook is trying to "discover" when the
user's account is already established - no need to discover anything.