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Nokia shares fall despite Windows handsets

5 September 2012 Last updated at 23:10 BST

Shares in the mobile phone company Nokia fell sharply on Wednesday, despite the unveiling of its first smartphones running the next version of Windows.

Once the leader of the mobile phone market, it has yet to recover from the massive hit it was blown by Apple's iPhone and various Android-based smartphones.

Rory Cellan-Jones reports from New York.