This is why I believe there is still some hope for a RIM comeback. A much as blackberries suck at multimedia and other "consumer" stuff, they have the lock-down mechanisms in place to make them perfect for the large enterprise.
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One of the biggest problems is that large companies want to see things like Product Road Maps. Apple makes it very clear they won't let you know whats going to happen 6 months ahead with any of their products. This really puts the enterprise off in many large companies because they like to know where technology is going in order to plan for it's impact on their infrastructure accordingly.