Outlook is a professional-grade messaging tool, right? So one might be able to imagine where with the thousands of contacts people accumulate, they might get into a situation where they enter a person’s data into two separate contacts. Now, one might think that there would be an option to merge two contacts into one (I mean, the Microsoft CRM has that feature, Plaxo has that feature, heck event the not “professional” OS X Address Book has that feature built in).
But no.
There are plugins that can help you eliminate duplicates contacts, but nothing that I can find built into Outlook 2007 natively. Oh, to dream…