can’t find default location of Outlook 2003 Contacts file

I accidentally deleted a business mailing list from my Outlook 2003 Contacts and want to swap in a back up of the whole Contacts file from yesterday (thank you Norton Ghost for auto archiving every night) to restore it. Nothing else has changed in the Contacts file since yesterday, so overwriting today’s version won’t cost me anything. But where is the Contacts file and what’s it called?

Tnx in advance. …one of those days over here.

Jim