RIM has taken one of its largest, more conspicuous blows as a leaked e-mail and subsequent confirmation have revealed on Monday that Halliburton is switching from the BlackBerry to the iPhone. After "significant research," according to an AppleInsider copy of the memo, the controversial energy giant has told staff that it will transition from the BlackBerry to the iPhone, described at first as a one-year transition but now described as two. Apple's platform had superior features, controls, and app development security, Halliburton said.