Here are the steps you could use to enable or disable auto sync of emails, contact and calendar on the Samsung Galaxy S2.
Do you often use the contacts, email or calendars in multiple places, such as on your device, computer and tablet? If so, you enable auto sync to make sure all the devices have the same data.
To enable auto sync do this:
1. Press the Home key.
2. Tap on Settings.
3. Select Accounts and Sync.
4. Then select Auto-Sync and ensure that it is enabled.
All your different devices now should be having the same data once the sync is completed.