Probably you have already followed the instructions in this screencast - How to Configure OWA as the Default Web Page . Another useful change is allowing the users to login with their e-mail address instead of typing domain\username. Setting this is easy and the following screencast shows you step-by-step how to achieve this:
I just finished the "Upgrade from Exchange 2007 to 2013" Part I screencast and must tell you that it is extremely well done! I found no variances between the video/script and what I experienced. At the end of Part 1 ...
Bob Duffett, Priority Software Inc. ...more...