Repair Outlook.com Sync with Iphone and Outlook Desktop
1.Open outlook calendar.
2. Change view by clicking view tab
3. Choose Change View and List.
4. You will now see a list of all your appointments. Click the first appointment one time. Press Ctrl+A to select all the appointments.
5. Now drag all your appointment from the calendar they are in to another calendar in your outlook. Preferably a local calendar.
6. All the appointments should move now to the other calendar. I would recommend you restart outlook after performing the move and give it at least a min of 1 hour for all the calendar events to be removed from your outlook.com and iphone.