Dr Tom calls out an excellent method of bouncing users from an "entry" URL to the right one (his example is bouncing someone from mail.example.com to mail.example.com/exchange, but it should work for others too).
If you can get the steps to work, I'd really like to see how you did it. When you create a Deny Web Publishing Rule, there is no option to redirect users to a different URL.
From my experience, and from the UI, the "Redirect HTTP requests to this URL" option is only available for a normal Access Rule - how do you write this rule? Specifically, who is the Destinaton of this rule? Local Host or a URL Set?
[tk] Hi Clint - I just ran through this:New -> Web Site Publishing Rule. Picked Deny as the action, then created a regular owa.example.com rule for a specific domain name with no path (not using the OWA publishing wiz, it's too specific). When the rule has been created, edit the properties and:Action tab - make sure it's set to Deny, then tick "Redirect HTTP requests to this Web Page", and enter https://owa.example.com/exchange/ in the box.The more-specific Allow rule for https://owa.example.com/exchange/ follows that one, and it should all work. I didn't muck around with any other properties - you want it to apply to everything, all requests, etc.
This was on ISA 2006 EE; don't think SE should be any different.