Were are on build 579.

I upgraded user's Nokia E7 to the latest firmware and also upgraded Symbian Anna to latest version. User reported that her address books in GroupWise and in the phone are empty after the sync.

Before I upgraded the phone I made backup of the phone wiht Nokia Ovi Suite, so I can restore the address book from the backup.

How can I troubleshoot why and how this happened?

Has anyone seen this before?