Increasing competition in the smartphone market could be detrimental to RIM. Nokia, Motorola, and Palm have been upping their offerings of smartphones, and Apple's iPhone could stiffen competition in the already cutthroat market. Unlike many of its competitors, RIM is almost entirely dedicated to the smartphone industry, offering devices, software, and services. As such, it's much more exposed to increased competition than much of the competition.
Apple has announced that the IPhone could host Microsoft exchange software which would bring in the corporate clients that RIMM holds as an competitive edge as of now.