"Thanks to an e-mail question from TaxMan, I wanted to give a little "Hosted Exchange 101" for a few reasons. First off TaxMan wanted to know what's the real benefit of this e-mail solution and who it's for. Secondly, the lack of native Exchange support is one of the few reasons I held off on an iPhone purchase and this gives me an opportunity to re evaluate my needs. My intention here isn't to provide an in-depth, technical overview of a hosted Exchange approach, but I'd like to give a quick high-level overview that might help readers understand if this choice is needed and viable for them."I have been in both places on this one. I ran my own Exchange server and now use a hosted service. The main reason I stopped running my own is I didn't have the time to keep up with all the security issues. Ranging from free to $20-$30/month you can have your own Exchange service. With Push Email (and HTML email on WM6), I think it is well worth looking into.