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Why can't I send a Microsoft Office document as an attachment to an Exchange account?

If you are getting a bounced email with an error like

#554 5.6.0 STOREDRV.Deliver; Corrupt message content ##rfc822;
it's possible Thunderbird is sending the attachment with the incorrect MIME encoding. To fix the problem:
  1. Close Thunderbird.
  2. Navigate to the following directory based upon your operating system:
    • Windows 2000/XP: C:\%userprofile%\Application Data\Thunderbird\Profiles
    • Windows Vista: C:\%userprofile%\AppData\Roaming\Thunderbird\Profiles
    • Mac OS X: /Users/<username>/Library/Thunderbird/Profile
  3. Open the directory named with a random set of characters like "yo6luyl8.default". There may be multiple directories if you have multiple Thunderbird profiles.
  4. Delete the file named 'mimeTypes.rdf'.

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