Outlook Express - The message could not be sent (0x800c0131)

December 2016


When you open up Outlook Express you get the following error message:

An unknown error has occurred. Protocol: SMTP, Port: 0, Secure SSL: No, Error 0x800c0131Ce problem may be due to corruption or lack of Folders.dbx file. 


  • To solve this, simply restore the file Folders.dbx.
  • Search for Folders.dbx using the search tool(Start/Find/Files or Folders).
  • Rename the file to make a backup, for example Folders.bak.
  • Launch Outlook Express. Folders.dbx file is automatically recreated and the application opens correctly.

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