Three key BlackBerry executives have left the company over the past couple of months and many more could soon be shuffling toward the exit as well. An unnamed source has told Bloomberg that more BlackBerry executives are expected to leave the company in the coming weeks as their retention bonuses expire and as CEO Thorsten Heins starts implementing ambitious sales goals intended to put members of his management team on the hot seat. Heins’ goals reportedly cover “phone sales, subscriber growth and product development,” as well as the addition of new apps for the BlackBerry 10 platform, Bloomberg’s source said. The tougher sales goals are a clear sign that Heins is not pleased with the progress that BlackBerry has made

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