iTunes for Windows: If first sync warns that all of your contacts will be changed
Symptoms
In Windows XP, Windows Vista, or Windows 7, when syncing iPhone or iPod touch with Address Book (Windows XP), Contacts (Windows Vista), Windows Contacts (Windows 7), or Yahoo, the first time you sync in iTunes 7.7 or later, you may see a warning that all of your contacts will be changed.
Products Affected
iTunes 7 for Windows, iPhone, iPod touch, iPhone 3G, Windows 7, iTunes 9 for Windows, Windows Vista, Windows XP, iTunes 8 for Windows
Resolution
This notification may appear the first time you sync, but the actual contacts will not be changed. Subsequent syncs will work as expected.
Important: Information about products not manufactured by Apple is provided for information purposes only and does not constitute Apple’s recommendation or endorsement. Please contact the vendor for additional information.