Making backups to address book / contact in outlook express is very easy, as not much different with how to backup outlook express email.
Make sure you log in to the user / os your account, then enter C: \ Documents and Settings after that you go to user / os account you an example: C: \ Documents and Settings \ Aip TANJAYA (here the user / account in my computer is TANJAYA Aip)
click Tools, then select option click the view tab, then click the option show hidden files and folders ... Ok
Then click the Application Data (C: \ Documents and Settings \ Aip TANJAYA \ Application Data), click the Microsoft folder (C: \ Documents and Settings \ Aip TANJAYA \ Application Data \ Microsoft), and then search the address book with the extension .wab