Nokia boss Stephen Elop predicts 'new dawn'

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Finnish mobile phone maker Nokia has launched two new smartphones based on Microsoft's Windows Phone 7.5 operating system.

The Lumia 800 and the Lumia 710 mark the beginning of Nokia's fightback against Apple's iPhone and rivals using Google's Android software.

Nokia's new boss Stephen Elop talked to the BBC's Rory Cellan-Jones about the significance of the launch.

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