Error 0x8000ffff adding a data file in the Mail applet in Outlook 2016

Applies to: Outlook 2016


You run Microsoft Outlook 2016, and when you open Mail in Control Panel and then click Add on the Data File tab, you may receive this error message:
An unknown error occurred, error code: 0x8000ffff

Error message recieved when adding a data file in the Mail applet

This is a known limitation in Outlook 2016.


To work around this issue, add the data file in Account Settings in Outlook 2016 by following these steps.

  1. Open Outlook 2016.
  2. On the File tab click Account Settings, and then click Account Settings.
  3. On the Data Files tab, click Add.
  4. Add the data file as needed, and then click OK.
  5. Click Close on the Account Settings window.