MCPBlog

If you have ever been puzzled with auto complete feature of Microsoft Outlook, how it works, where it stores addresses, search no more. I've needed to remove all auto complete addresses from user's profiles (they had large amount of wrong addresses), so I started digging in attic AKA Google for solution.

After a while I found that all "memorized" addresses are stored in file "Outlook.nk2". In order to remove all of them you simply need to remove that file. File is located in "%APPDATA%\Microsoft\Outlook\Outlook.NK2". So simply delete it or if you have AD attach a GPO with simple script to group of users or specific OU.

Example for GPO script:

del "%APPDATA%\Microsoft\outlook\*.NK2"

And don't worry about the deleted file. As soon as you open Outlook, send first email to someone and close Outlook file will be created.

Have fun, as my users had :)