If you change the same piece of information (for example, a phone number) in more than one place, all your devices are updated with one version of the information, and the other versions are stored in the Conflict Resolver.
You can resolve conflicts at any time by choosing which information to use on your computer and devices.
Choose Resolve Conflicts Now from the sync status menu on the right side of the menu bar, and follow the instructions that appear. (If you don’t see the sync status menu, choose iSync > Preferences, and then select the “Show status in menu bar” checkbox.)
If you see “No Conflicts” in the sync status menu, the synchronized information did not contain any conflicts.
After you resolve all the conflicts, it’s a good idea to sync your computer and devices again to make sure your choices are updated everywhere.