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Problems with syncing iPhone and Calendar with iTunes 8.1

I just updated to the new iTunes version 8.1. I just tried to sync my iPhone, and got the Sync Alert:
"Syncing with your iPhone will change more than 5% of your Calendars on this computer."

Under the Modify section, it lists all of the birthdays found in my address book. For some reason, it wants to update the location information of all of those birthdays from my address book to an empty location. There are also a few random calendar events that I have updated within the past week(?) that iTunes also suddenly wants to modify.

Is this an error, or is it a new way that Apple is synchronizing birthdays? I chose to Cancel the sync operation instead of modifying all of the birthday information. Unfortunately, now none of my added calendar events can be updated to my iPhone without also modifying ALL of what I described.

MacBook Pro, Mac OS X (10.5.6), 2.53 GHz, 4 GB

Posted on Mar 11, 2009 11:25 PM

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28 replies

Mar 12, 2009 7:56 AM in response to Paul Eckberg

Same problem here. Syncing works fine until it gets to the calendars, then it goes forever. This was an immediate problem upon update to 8.1, as everything worked great until that point. Looking at the task manager under windows during the sync, there's very little activity going on. I'm trying a restore now to see if that helps, didn't see the comment about the birthdays until too late 😟. All I have to do is turn off calendar syncing and it works. Interestingly, if I turn on calendar syncing, but use the "Sync selected", but don't select any calendars, it still hangs.

Mar 12, 2009 11:34 AM in response to Paul Eckberg

I have this problem. AS sson as iTunes 8.1 installed I get this error when I synch.
So far I have:
1 - Reset synch history
2 - Restarted PC
3 - Restarted iPhone
4 - Deleted all calendar entries on iPhone
Still getting the problem. I have no calendar app on my PC and on the info tab it says 'No supported calendar application found'
Only had my iPhone a week and this is not a good introduction.

Mar 12, 2009 8:56 PM in response to viper5150

I was having the same problem and THIS SOLVED THE TRICK!!!
Re: Problems with syncing iPhone and Calendar with iTunes 8.1
Posted: Mar 12, 2009 8:30 PM

Had the same problem using Outlook 2007. Unchecked the Sync Calendars with Outlook option in the info tab and hit apply, which started the sync process. After the sync process was done, checked the Sync Calendars option again and used the selected calendars option instead of all calendars. Now it appears to be working...

Problems with syncing iPhone and Calendar with iTunes 8.1

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