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NK2Edit is a utility that lets Outlook users edit the auto-complete information that pops up in the To:, From:, CC: and BCC: fields of new email messages. Normally, users cannot edit data stored in.nk2 files.

If the .nk2 files become corrupted or get deleted, all auto-complete data associated with that instance of Outlook disappears. Additionally, NK2Edit lets you edit that information and perform a few other maintenance functions.

The tool lets users directly edit and delete entries within the .nk2 file. When you double-click on an entry, you see the email address, display name and the search string used for that address. You also see the drop-down name, which appears as an auto-suggestion when you begin to type.

Searchexchange has the details HERE!