You would need to use a 3rd party utility or VBA to create the identifier.
See
http://www.slipstick.com/addins/housekeeping.asp for tools.
--
Diane Poremsky [MVP - Outlook]
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"NancyFerg" <(E-Mail Removed)> wrote in message
news:37A7073A-5855-4861-9178-(E-Mail Removed)...
> If each email had a specific auto-generated number tag attached (like many
> scanner softwares do), the emails with duplicate "subject" (such as Joe
> Smith
> file) could be saved outside of Outlook without overwriting prior emails
> with
> the same generic name.