http://blogs.technet.com/b/educloud/archive/2012/01/12/owa-and-client-authentication.aspxOWA URL So you are deploying Office 365 in a hybrid configuration. Of course you want to configure the clients to go to the same URL. It would not be seamless and that is the goal of a migration. So if you have a URL that is https://mail.contoso.edu/owaen-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)