From Walt Mossberg's WSJ review today: While you can have both personal and Exchange email accounts on the new iPhone, if you synchronize with Exchange calendars and contacts, your personal calendar and contacts are erased. I've heard some say that all this means is you must combine your business and personal contacts, but how does this work with Mobile Me? If you sync via Exchange, will Mobile Me be useless and inoperable? Also, what does this mean for additional (personal) email accounts? Say, if I set up my Exchange account, which obviously will be syncing to Outlook on my PC, will my Gmail account not sync as well? This could be a HUGE dealbreaker for me and many others who are hoping to use this thing as a BlackBerry replacement.