I think I posted in another forum about ExchangeMyMail but felt I needed to add to this one as well. Dave and everyone at ExchangeMyMail have been AWESOME!!
The service I get from them is incredible and blows me away sometimes. Instant responses and fixes to any questions or problems I am having. I'm using the Exchange and BlackBerry hosting. Setup was easy and when I ran into a couple of problems (on my end), Dave responded immediately and helped me out. Oh, did I mention that was late on a Sunday night? lol... great service!