The resources required of the air-traffic control and airport system to fly a chief executive in his jet are the same required to fly a 767 full of passengers.

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The introduction of Windows smartphones has been the big change under chief executive Stephen Elop, who phased out the Symbian operating system shortly after he took control of the company in 2010.

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"Skype is a nightmare for law-enforcement agencies" because of its encryption, says David Vincenzetti, chief executive of Milan-based HackingTeam, which sells a program called Remote Control System that works on computers, smartphones and Blackberries.

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