TORONTO (Reuters) - A wave of optimism surrounding the launch of Research In Motion's re-engineered BlackBerry line picked up momentum on Thursday with Goldman Sachs raising its rating on the smartphone maker and setting off a surge in its share price. The brokerage firm joined a growing chorus of analysts who have warmed to the prospects of a successful introduction of the new BlackBerry 10 devices, which RIM hopes will let it claw back market share lost to Apple Inc's iPhone and smartphones powered by Google's Android platform. ...

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