Look at synchronizing the two with the Outlook Contact Item LastModificationTime property, which will return a Datetime of when the contact was last modified in Outlook. You'll have to provide your own field (and code) to trap that in the VFP table.

>My users fax use vfp 6.0 and ms outlook/rightfax. Other than updating the entire contacts from a vfp table everyday, is there a way i can just determine which records have been changed in the ms outlook contacts and the vfp 6.0 table and just update that particular record(s)?