Blackberry maker Research In Motion (RIM) has seen its second-quarter profits more than double on the back of surging subscriber numbers.

For the three months to 1 September, the Canadian firm made a net profit of $287.7m (£141m), compared with $140.2m for the same period in 2006.

RIM said the profit jump, which beat market targets, was helped by global users breaking the 10-million mark.

Blackberry is the market leader in handheld e-mail devices.

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