target="_blank">www.blackberry.com) dropped 10% in response to a new alliance between Apple and IBM. Under the terms of the deal, IBM will develop business-related apps for Apple’s popular iPhone and iPad mobile devices. That could hurt sales of BlackBerry’s smartphones. However, BlackBerry already makes servers and software that securely handle Apple’s devices, as well as those powered by Google’s Android software. Hold. BLACKBERRY LTD. $11 (