The Sync command assures that your Yahoo! Mail contacts and the contacts in your device are both up-to-date. When Yahoo! Go 3.0 detects a difference, it offers you the opportunity to use the Sync command. The synchronization takes a little while, depending on the number of changes. Choose OK to acknowledge the synchronization when it's finished.

Note: Some devices do not support Address book sync or Sync, and Yahoo! Go 3.0 can’t determine beforehand that these features won't work on these devices.