Try resending the service books from the host routing table and if that doesn't work try resending them from the email settings app or the BIS site. Worst case scenario, you would have to reload the OS to get it back.
Posted from my CrackBerry at wapforums.crackberry.com
Type "browser" (without quotes) into the key word field and select Search Titles Only in the drop down field. You will get tons of threads on this. Bottom line: you will be told to resend your service books.