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Windows Phone 7 is now officially released, and its app store, Marketplace, is out of its test phase. Given the lack of backwards compatibility with existing Windows Mobile apps, Microsoft's new mobile platform clearly has a lot of catching up to do with its rivals — Apple's iPhone App Store, Google's Android Market, RIM's BlackBerry App World and Nokia's Ovi Store.
Still, the Windows Phone 7 Marketplace is growing by the day, and there are already plenty of free and paid-for apps of interest to mobile professionals. Here's an initial selection from the more businesslike of Microsoft's app categories — which are, in full: Games, Entertainment, Music & video, Photo, Lifestyle, News & weather, Sports, Health & fitness, Finance, Travel, Navigation, Social, Productivity, Tools, Business, Books & reference.