BlackBerry Ltd's shares took a hit on Wednesday after International Business Machines Corp said it planned to partner with Apple Inc to sell iPhones and iPads loaded with applications geared to business users. The Apple-IBM tie up, beginning this fall, is set to target the customer base that BlackBerry is attempting to woo as part of a turnaround under new Chief Executive Officer John Chen. "It is not a crushing blow at this early stage, but

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