Outlook address book missing in the backup folder

[address book backup from outlook folder]

I have back up the entire outlook express folder &
imported to the new system. I got all my folders &
messages but there is no address book. I tried import
address book manually. file > import > address book, & I
locate outlook folder(backup) I couldnt locate address
book file. I remember I have exported address book
(TEXT FILE COMMA SEPERATED VALUE ) some where in my
backup disk before I format my old hard disk but I messed
up with some old address book backup. Kindly help me to
retrieve this.

Thanks.