If business achievement were an Olympic sport, there's no doubt that Mike Lazaridis and James Balsillie -- co-chief executive officers of Waterloo, Ont.'s Research In Motion Ltd. -- would be standing on the medals podium. Over the past decade, they have presided over one of the world's most astonishing high-tech success stories: the BlackBerry, the ubiquitous, wireless, handheld e-mail gizmo that hundreds of thousands of corporate executives, legislators and law enforcement officials now regard as an essential business tool.