I agree that in theory the Microsoft "push" solution will be cheaper from an IT perspective.
What about the end user?
If I were to go with a PPC device, I'd have to subscribe to a non-Blackberry data plan. And as I suspect that the Microsoft "push" solution will be quite chatty with the Exchange server, I'd likely need an unlimited data plan. So that pushes the monthly fee from $60CAD to about $100CAD. And while $40 per month won't discourage most of us, if I was a company deploying hundreds of these devices...well...that's a big difference.
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