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By Euan Rocha and Alastair Sharp TORONTO (Reuters) – IBM Corps recent move to partner with Apple Inc to sell iPhones and iPads loaded with corporate applications has excited investors in both companies, but two rivals say they are unperturbed for now. Top executives at Dell and BlackBerry Ltd scoffed at the threat posed by the alliance this week, arguing the tie-up is unlikely to derail the efforts of their own companies to re-invent themselves. I think it just made a good press release, John Swainson, who heads Dells global software business, said in an interview with Reuters in Toronto on Thursday. PC maker Dell and smartphone maker BlackBerry are in the midst of reshaping their companies around software and services, as the needs of their big corporate clients morph.