Connect MS Outlook and ECI2 DDMS

We need an API that will direct customer data located in a .DBF based (yes, thats DBase from the old days) with various installations of MS Outlook (no exchange). In essence, a given customer who is documented and stored in MS Outlook would have usage data stored in the .DBF based server system. We need a connection between that server based system and a salesman's MS Outlook address book for real time data updates.