Take a look at the EntryID property for ContactItems. This is a unique ID assigned to a Contact in Outlook when created. You could store this as your foreign (lookup) key on the VFP side.

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>I can successfully programatically add contacts and appointments to Outlook from VFP. What I do not understand is how to UPDATE (synchronize) records between VFP and Outlook because there is no unique ID field in Outlook.
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>Suppose, for example, there are two Robert Jones in my contact list. One of them changes addresses. How do I determine which Outlook Robert Jones to change?? Do I have to look at all of the fields to determine whether I have the correct contact?
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>Thanks,
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>Ken