We have already demonstrated how to configure OWA (Outlook Web Access) as the default web page in IIS6 / Exchange 2003:
How to Configure OWA as the Default Web Page

Now, we would like to demonstrate a similar Screencast about Exchange 2007 on Windows Server 2008 scenario.
Instead of configuring a redirection on the Default Web Site, and removing the inherited redirection from the included directories (which might be quite tedious and especially difficult for the Exchange Virtual Directories), we offer a much simpler and elegant approach.