Customers line up for the release of Microsoft Corp.'s Xbox "Halo: Reach" video game outside a Game Stop store in Munich, Germany, on Tuesday, Sept. 14, 2010. Since the debut of "Halo" in 2001, the alien-invasion-themed game and its related books, toys and apparel have generated $2 billion in sales for Microsoft. Photographer: Guido Krzikowski/Bloomberg via Getty Images
