TORONTO (Reuters) - Research In Motion Ltd, for months enveloped by a wave of negative sentiment, got a boost on Tuesday when one of its most influential critics raised his rating on the stock ahead of the launch of RIM's make-or-break new line of BlackBerry 10 devices. The upgrade by Jefferies & Co analyst Peter Misek pushed RIM's share price into double digits for the first time in five months, with the stock up more than 3 percent at $10.04 in early trading on the Nasdaq. ...

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