Administrators can disable it for all users using GPO. To disable the autocomplete list by editing the registry, you need to set the ShowAutoSug data value to 0. It will not remove contacts stored in your data file in the Suggested Contacts folder (see next section.) To use, close Outlook and in the Start menu, Search field or Run command (Windows key + R to open) type or paste the following line and press Enter to run Outlook.exe /CleanAutoCompleteCacheĬlearing the auto-complete list only removes the addresses you see as you type in the To, CC, or BCC fields. If you prefer using a command line, switch, it's CleanAutoCompleteCache. You can clear the auto-complete list by going to File, Options, Mail - the option to use the auto-complete list and the button to empty it are in the Send messages section about halfway down the dialog. Because the cache is stored in the data file or mailbox, it moves with you and you'll have the auto-complete list when you open your mailbox on any computer using Outlook 2010. Addresses are added to the hidden cache file as you send new messages and replies. When you upgrade from Outlook 2003/2007 to Outlook 2010, the NK2 is imported into the data store and the NK2 is renamed nk2.old. In Outlook 2010, its a hidden message in the data file.

The auto-complete list, aka the NK2 file, was a separate file in Outlook 2003 and Outlook 2007.

Also see Understanding Autocomplete cache (NK2) for file paths and more information, especially if using Outlook 2003 or Outlook 2007.Īutocomplete List | Suggested Contacts | Populate the Auto-complete list | Tools

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