I have an Incredible. 2.2 is on there (aka FroYo). I am reasonably happy with the stock implementation of Exchange support except that the phone seems to be intermittent in it's willingness to sync "As items arrive". I have the thing set to "As Items Arrive" for both peak and off-peak. Sometimes it will show new mail (and bing at me) on it's own. Other times it doesn't, though it does seem to initiate a sync after I turn the phone on and go the mail app (or look at the sync settings screen in the control panel). Any idea what is going on?