Outlook 2010 Does Not Retain Autocomplete History

We recently helped a user upgrade from Office 2007 to Office 2010. After the upgrade, the user reported that the Outlook does not retain autocomplete history. The autocomplete history only stays for the session of the application. If the user quitsOutlook 2010, the autocomplete history is gone.

We found out that the problem is because the Stream_Autocomplete*.dat file on the user’s profile is bad. The size of the file is always zero K, and the program cannot write to it. The solution is to delete the file and let Outlook recreate it again.

Here are the steps:

  1. Close Outlook 2010.
  2. Browse to this directory (Windows 7):

    Substitute username with your own user name. Please refer to this post if you do not know how to browse to the directory.

  3. Right click on the Stream_Autocomplete*.dat file, and select Delete to delete the file.
  4. Start Outlook 2010, and the file should be generated automatically.

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