My work causes me to be away from the office with some regularity. I'd like to remain connected to our IM client (Yahoo!) and our Exchange server. From what I gather from the (limited) literature on T-Mobile's website this is supported.

My questions are, has anyone else used Yahoo! and/or accessed an Exchange server via their T-Mobile phone and if so what was the experience like?

Also, is there any way to get T-Mobile to let me try this out for a month - can I just explicity turn the feature on for a month and if I don't like it, turn it off? Thanks.

I'm using a Nokia 6600 if it matters.