Angry Birds fans sporting a Windows Phone handset can pick up some of the fearless fowl's titles for free at the Windows Phone Store; the particular games that are on the house at the moment include the original Angry Birds, Angry Birds Star Wars I, Angry Birds Star Wars II and Angry Birds Rio. But that is in the U.S. Other countries see to have a different selection of free Angry Birds game...Source: http://www.phonearena.com/news/Certain-Angry-Birds-games-are-free-for-a-limited-time-at-the-Windows-Phone-Store_id48742
