We have RIMS. I don't have one, but that's what the company uses.
Internally I have an IM box that is there for only one thing, email, via outlook.
I forward all my mail to a gmail account so I can access it on the box I work on. Linux.
I just bought a Nexus One, voila, there's all my mail.
An aside: Android sales have surpassed iPhone.
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