How restore outlook address book?

i have taken an image backup of my PC, and formated it. re-installed the windows and all the other applications.
now i'm trying to restore some data files of these applications. i've managed so far to restore my outlook (.PST) file from the backup image. but i can;t manage to find the address book file.
where can i find that file which holds all the information about all my addresses in MS Office outlook 2007.