(Reuters) - Blackberry Ltd warned on Friday that it expects to report a huge second-quarter operating loss next week and that it plans to cut more than a third of its workforce. Commentary: BRIAN MODOFF, ANALYST, DEUTSCHE BANK RESEARCH "It's not surprising in the sense that we haven't seen any traction with their devices, and it's obviously exacerbated by the fact that you've got Apple out with a new product, you've got several new Android products, and Blackberry continues not to get traction. ...

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