MobileMe: How to reset sync data

Important: Resetting sync data is not an appropriate troubleshooting step to solve calendar sync issues. Instead, please see Troubleshooting MobileMe Calendar issues.

If you reset the sync data, be sure that you reset it from the computer that has the most up-to-date information on it. Here are some examples:

• If the most up-to-date data is on MobileMe, you should analyze your options very carefully:
  • If you have up-to-date data on your computer as well as MobileMe, you should back up the data on your computer and then attempt to sync from MobileMe to your computer. You can do this either in your standard user or another user account.
  • If you do not have any important sync data stored locally on your computer, you can attempt to sync from MobileMe to your computer, replacing the data on your computer with what is on MobileMe. If you're unclear about what to do in this situation, contact MobileMe Support for assistance.
• If the most up-to-date data is on your computer, you would want to follow the instructions below to reset the sync data on MobileMe and replace it with the data found on your computer.

Important: It is advised that before performing the below steps, you should back up your data.

To reset your MobileMe Sync data in Mac OS X v10.5.8 or Mac OS X v10.6 or later

1. Make sure that all your data is correct and current in Address Book, Safari bookmarks, Keychain, Mail, and other applications that use MobileMe Sync, and that you are connected to the Internet.
2. Open System Preferences and select MobileMe.
3. Sign in to your account if you are not already signed in.
4. Click Sync, then click the Advanced button.
5. Be sure there is a checkmark next to "Synchronize with MobileMe."
6. Also be sure that each data type you want to sync (such as Contacts) has a checkmark next to it.
7. Click Reset Sync Data.
8. From the Replace pop-up menu, choose the information you want to reset, such as Bookmarks, Keychains, or all data. 
9. Click the right arrow button so that the orange arrow "flows" from the computer icon to the MobileMe icon in the window, and the text above the icons says "On MobileMe with sync info from this computer."
10. Wait for the sync to complete. Depending on your Internet connection and on the data you are syncing, it may take several minutes. The status of your sync is indicated at the bottom of the Sync panel.

To reset your MobileMe Sync data in Mac OS X 10.4.11

1. Make sure that all your data is correct and current in Address Book, Safari bookmarks, Keychain, Mail, and other applications that use .Mac Sync, and make sure that you are connected to the Internet.
2. Open System Preferences and click .Mac.
3. Click the Advanced tab and then click Reset Sync Data. (If Reset Sync Data is dimmed, click the Sync tab and make sure categories to be synced are checked, then go back to Advanced.)
4. From the "Replace" pop-up menu, choose the information you want to reset, such as Bookmarks, Keychains, or all data.
5. Click the right arrow button so that the orange arrow flows from the computer icon to the .Mac icon in the window, and the text above the icons says "On .Mac with sync info from this computer."
6. Wait for the sync to complete. Depending on your Internet connection and on the data you are syncing, it may take several minutes. The status of your sync is indicated at the bottom of the Sync panel.

To reset your MobileMe Sync data in Microsoft Windows

1. Open the MobileMe Control Panel in the Windows Control Panel.
2. Sign in to your account if you are not already signed in.
3. Click Sync.
4. Be sure there is a checkmark next to "Synchronize with MobileMe."
5. Also be sure that each data type you want to sync (such as Contacts) has a checkmark next to it.
6. Click Advanced.
7. Click Reset.
8. From the "Replace" pop-up menu, choose the information you want to reset, such as Bookmarks, Contacts, or all data.
9. Choose to replace the data on your MobileMe with data from your computer.
10. Wait for the sync to complete. Depending on your Internet connection and on the data you are syncing, it may take several minutes. The status of your sync is indicated at the bottom of the Sync panel.