A long time ago we needed a script to remove the cached contacts in Microsoft Outlook. After some research we found that these were stored in a NK2 file in the user profile directory. To run the script please close Outlook and create a new batch file (text file with the extension of .bat), or download the file below.

Please not this will create a backup of the NK2 file so everything can be reverted.

@ECHO off

TITLE Clear the nickname automatic completion caches in Outlook
CLS

ECHO Clearing the nickname automatic completion caches in OutLook...
ECHO Created by Blake Niemyjski (https://blakeniemyjski.com)
ECHO.

CD %userprofile%\Application Data\Microsoft\Outlook

RENAME *.NK2 *.NK2.BAK

ECHO.
ECHO The operation has now completed.
ECHO.

PAUSE
EXIT

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