Recently a strange situation w/ my mobile users that use iPhones with our Exchange Server. Setup is Exchange 2003 SP2 using Exchange ActiveSync to sync w/ iphones remotely. Recently, calendar syncing is only working in one direction (mobile to server). That is, if a calendar event is created on the phone, it syncs properly back to Exchange. It is not working in the other direction (i.e. if a calendar event is created in outlook, it never gets synced out to the mobile device). This has just popped up recently. All other items (mail and contacts) are syncing correctly still.