Have a look in the root folder of your Default Web Site, usually c:\inetpub\wwwroot . There should be a file named default.asp . Rename this (in case you need the original back again in the future), and create your own using notepad. The contents should look like this single line:
I am curious about this aswell, so I hope you don't mind me joining in;
I have a 2k3 STD server running OWA and it works fine with webmail.domain.com/exchange. I dont have that default file in my folder, but I have tried another workaround wich is to add a redirect in IIS manager (Right click, Properties on Default web site, go to home directory and change that to "A redirection to an url" and add /exchange to the textbox. I assume this does the same thing. However, when I do this, I get the login box, but I just get a the "This page cannot be displayed" after logging in.
Have a look in the root folder of your Default Web Site, usually c:\inetpub\wwwroot . There should be a file named default.asp . Rename this (in case you need the original back again in the future), and create your own using notepad. The contents should look like this single line: