After upgrading to v4 on iPhone, my calendar will no longer sync. Contacts are syncing fine. I have tried EVERYTHING on all the forums (MS and Apple). I worked with Apple support and they said it must be an Outlook problem, because when I create a new user with a new calendar in my Outlook 2007, the new calendar syncs to the iPhone. PLEASE HELP! I have been trying to fix this for over a month!