Microsoft on Tuesday released the latest version of its smartphone operating system, a version that could make handsets using the OS more competitive with market leaders Android and iOS. The new release -- Windows Phone 7.5, aka "Mango" -- has more than 500 new features, according to Microsoft, most of which are aimed at improving the productivity of those who use phones running the operating system. Mango makes it easier to set up groups of people, broadcast messages to them and keep tabs on what they're up to.
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