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Clearing the Outlook Nickname / Autocomplete Cache

Microsoft Outlook keeps a copy of email addresses used (“nickname list”) which it uses for both automatic name checking and automatic address completion. The nickname list is automatically generated as you use Outlook. Later versions of Outlook called this list the Suggested Contacts or Autocomplete List.

Over time, the nickname cache can contain addresses which become obsolete and this creates the possibility that Outlook may send messages to the wrong person.

Also, if the nickname cache becomes corrupt due to power failure, improper shutdown, disk errors and the like, Outlook will malfunction.

The simplest way to resolve problems associated with the list is to delete it, and allow Outlook to rebuild it.

  1. Close Outlook.

  2. Click Start, Run. Type CMD and click OK.

  3. At the command prompt, type:

    If using Outlook 2013 or above:

    DEL "%LocalAppData%\Microsoft\Outlook\RoamCache\Stream_Autocomplete*.*"

    If using Outlook 2010:

    Outlook 2010 stores the nickname cache in a separate contacts folder called Suggested Contacts. If you wish to clear the list, delete the contents of this folder. If you are having problems with the list, try repairing the PST file.

    If using Outlook 2000/XP/2003/2007

    DEL "%APPDATA%\MICROSOFT\OUTLOOK\*.NK2"

    If using Outlook 97/98:

    DEL "%APPDATA%\MICROSOFT\OUTLOOK\*.NICK"

    and press ENTER.

  4. Type EXIT and press ENTER to close the command prompt.

You can also delete individual entries.

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