Windows Phone chief Joe Belfiore
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Microsoft's Joe Belfiore on smartphone app race

With the launch of two blockbuster apps for Windows Phone 8 - Waze and Instagram - the platform has filled in two of its biggest software gaps.

The corporate vice-president of Microsoft's Windows Phone programme, Joe Belfiore, tells the BBC's Richard Taylor that after some challenging times, WP8 is now looking to conquer the market.

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