Outlook contacts not synchronizing

Follow these steps to delete and undelete Desktop [SYNC] service book.

1. Goto Options (wrench icon).
2. Select Advanced Options.
3. Select Service Book.
4. Locate Desktop [SYNC] display the menu and select Delete
5. Confirm the delete before exiting Service book option
6. Go back to the Service Book option and display the menu and select Undelete.