Q: How can I clear the Microsoft Office Outlook auto-complete address cache?
A:Outlook has an auto-complete cache to help fill in recipient information when adding recipients. If you want to delete this auto-fill cache, you can delete individual items or the entire cache. You remove individual items by typing an address on the To line of an email, and when the auto-fill suggestion is displayed, press the Delete key. To delete the entire cache, stop Outlook, navigate to the %APPDATA%\Microsoft\Outlook folder (type this in Explorer address bar), and delete the Outlook.NK2 file. Restart Outlook.