Reset sync history I've noticed a bug that might be related to the issue of duplicate contacts.
If you hit reset sync history in the isync connector control panel on the Mac, it will bring up the OS X prompt asking if you want to approve such a large change to Address Book or iCal. If you say no/cancel, it will show up again later. For every time you say no/cancel, it will duplicate your fields within each contact that many times.
Any chance you were using reset sync?
Does anyone know if there is a fix for this? |