When using Outlook, and you begin typing an email address (or name) in the To: field, Outlook will show you recent recipients that match what you’ve typed so far. In this post: How to delete addresses from the autocomplete cash, How to delete the entire autocomplete cache, and How to move the autocomplete cache to another computer or installation of Outlook.
Delete an address from the autocomplete cache – When the address pops up, simply arrow down and highlight it. The press Delete. That’s it.
Delete the entire autocomplete cache – The autocomplete cache resides in a file called <profile_name>.NK2. If you delete this file, the cached addresses will be blown away, and Outlook will create a new empty file. The file exists in %APPDATA%\Microsoft\Outlook. On XP, it’s most likely C:\Documents and Settings\<username>\Application Data\Microsoft\Outlook\<profile_name>.NK2, and in Vista and Windows 7, it’s most likely C:\Users\<username>\AppData\Roaming\Microsoft\Outlook\<profile_name>.NK2.
Move the autocomplete cache to another computer or installation of Outlook – Simply copy the NK2 file to the appropriate folder, delete the existing NK2 and rename the coppied NK2 to match the previous one.