This is a very good article, and quite timely considering that many people are looking for the new devices that will be released in the Fall/Winter seasons. I personally have Exchange for two accounts, and POP for the other 9 (or 10) that I have. I find POP access easier to setup, though with the exchange accounts that I am in, they are easier to deal with across the distances that I have with those people.
[if you dont mind, I linked to this article at
http://mobileministrymagazine.com as it fits very well with what is being established in that community in terms of having the info to make mobility a well used option; if making a posting there is an issue, please PM me and I'll make the changes]