Fast Way to Clearing or Deleting Autocomplete List in Outlook 2010 on Exchange.

The Short Way

Method 1

  1. With Outlook 2010 open, click File (BackStage), and then click Options.
  2. Click the Mail tab.
  3. Under Send Messages, click Empty Auto-Complete List.

The Long Way.

Individual names can be easily removed from the list by using the new inline Delete function.  Just simply type the first few characters of the name you wish to delete and press the Delete key or click the X.

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What this means for you is that your AutoComplete list is synchronized between platforms: OWA, Windows Mobile and Outlook will all share the same AutoComplete list.  While this sounds up front like a great enhancement there are some changes that you need to be aware of in case you need to clear this list.

First, there is no more NK2 file.  The actual file you are looking for is located is:

C:\Users\%username%\AppData\Local\Microsoft\Outlook\RoamCache\Stream_Autocomplete*.dat.

Deleting this file will not clear your AutoComplete list.  As soon as you start Outlook 2010 the file will reappear, along with any bad addresses.  So how does one clear the entire list?

Other things to know:

AutoComplete list is now stored on the Exchange Server.

Use one of the methods listed below to reset the Outlook nickname cache for Microsoft Outlook 2010.

Method 1

  1. With Outlook 2010 open, click File (BackStage), and then click Options.
  2. Click the Mail tab.
  3. Under Send Messages, click Empty Auto-Complete List.

Outlook will generate a new nickname cache.

Method 2

  1. Click Start, and then click Run.
  2. Start Outlook by using the /CleanAutoCompleteCache switch.
    For example: Outlook.exe /CleanAutoCompleteCache
    Note If Outlook is not installed in the default location, you will need to point to the path of Outlook.exe.

Outlook will generate a new nickname cache.

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