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1. Open iTunes.
2. From the Edit menu, choose Preferences.
3. Click the Devices tab.
4. Click the Reset Sync History button.
5. Connect your iphone back and try to sync your iphone again.
1. Reset the Sync History again using the steps above.
2. Select the device in iTunes and click the Info tab.
3. Scroll down to the Advanced section, and under "Replace information on this iPhone" select Calendars.
4. Click Apply.