For the past few weeks i have noticed that the syncing of my iPhone has stopped working. I have basically been ignoring it. When iTunes has got to the sync of the calendar information, it just continues for ever and never stops. On one occasion i left it for around 5 hours.

I decided to try and sort it out.

Searching the web for inspiration has found many people with the same problem but no solution.

In iTunes in Edit -> Preferences

There is a ‘Reset Sync History’ Button

itunes hanging calendar sync

itunes hanging calendar sync

Performing a ‘sync reset’, seems to clear the problem, all other attempts like removal of calendars and adding of the calendar again failed.