TORONTO (Reuters) - Shares of BlackBerry Ltd rose more than 4 percent in trading before the bell on Monday, following news of interest from strategic buyers in the embattled smartphone company and an analyst upgrade on the company's stock. Shares in the company rose above the $8 mark after a Reuters report on Friday that the Waterloo, Ontario-based company is in talks with Cisco Systems, Google Inc and SAP about selling them all or parts of itself. ...



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