Ok. Welcome to iMore! How do you mean it doesn't work? Does the app open? Can you see dates? We need more information if we are to help. What, exactly, does not work on your Calendar?
Mine stopped working too. All events scheduled by me disappeared. Can't schedule anything (+ signed turned from red to grey). Per scheduled holidays etc do appear. Help!
Mine stopped working too. All events scheduled by me disappeared. Can't schedule anything (+ signed turned from red to grey). Per scheduled holidays etc do appear. Help!