By Euan Rocha TORONTO (Reuters) - BlackBerry Ltd warned on Friday it expects to report a huge quarterly operating loss next week and that it will cut more than a third of its global workforce, rekindling fears of the company's demise and sending its shares into a tailspin. The company, which has struggled to claw back market share from the likes of Apple Inc's iPhone and Samsung Electronics Co Ltd's Galaxy phones, said it expects to report a net operating loss of between $950 million and $995 million in the quarter ended August 31, due to writedowns and other factors. ...



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