by kirupa | 14 July 2010
Unlike a typical desktop or laptop, applications on your phone can be designed to work well when viewed in either portrait orientation or in landscape orientation. I emphasize "can be" because you do not have to make your application look nice across both orientations. You can just design for one.
This is a companion discussion topic for the original entry at https://www.kirupa.com/windowsphone/designing_orientation.htm