The rate of change wouldn't be an issue if some things in the platforms were stable, such as a uniform security model, management interface, and some data standards. We get occasional calls from users who are asking "Why doesn't my XYZ app hook to my ABC app?" and the usual answer is that they were written by two different suppliers who had no intention of communicating to each other. Security is a nightmare, every week we find somebody who is in violation of corporate security policy because of stuff they've done with with their phone or their tablet. VPs who are on their second warning are finally starting to get the message that having HR datafiles on their tablet will get them fired.
Finally, I think the market dollar estimates are low. After some false starts with not-so-smartphones and PDA's, today's mobile devices and tablets are finally becoming a viable alternative to Wintel PCs and laptops. The mobile software market isn't controlled by one giant vendor like Microsoft. There's a lot of opportunity in small niche apps, if the apps developers learn to start catering to the enterprise user instead of kids and consumers.
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