[Pibe38]

Wow that's really expensive!

Well you don't really need to have exchange open all the time. Heck, you don't even have to have set to push. You can set up Activesync to check every X minutes and there also schedule settings, so you can have the phone not check at night for example.

I would also set POutlook to download only headers, that way you minimize data transfer when downloading e-mail and you can choose what to download after the headers are on the device.