Knowledgebase & FAQ

When viewing an MSG attachment, receive a "HTTP Error 404 - File or directory not found." message


On an IIS server running on Windows 2003, when viewing an attachment which is a MSG file (ie. Outlook Email) you will receive the following error.

The page cannot be found

The page you are looking for might have been removed, had its name changed, or is temporarily unavailable.

Please try the following:

  • Make sure that the Web site address displayed in the address bar of your browser is spelled and formatted correctly.
  • If you reached this page by clicking a link, contact the Web site administrator to alert them that the link is incorrectly formatted.
  • Click the Back button to try another link.

HTTP Error 404 - File or directory not found.
Internet Information Services (IIS)

Technical Information (for support personnel)

  • Go to Microsoft Product Support Services and perform a title search for the words HTTP and 404.
  • Open IIS Help, which is accessible in IIS Manager (inetmgr), and search for topics titled Web Site Setup, Common Administrative Tasks, and About Custom Error Messages.


Earlier versions of IIS include a wildcard character MIME mapping, which permits IIS to serve any file regardless of its extension. IIS 6.0 does not include this wildcard character MIME mapping and does not serve any type of extension that is not defined at the MimeMap node in the IIS metabase.


Please see Microsoft Knowledgebase Article: IIS 6.0 Does Not Serve Unknown MIME Types (Article ID 326965) for instructions on adding MSG as a permitted MIME type.

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