How to change the X-Mailer: header in emails send with Microsoft Outlook 2003

People who recieve emails from you when you use Microsoft Outlook 2003 can see what client you're using; all they need to do is look at the headers of your message:

MIME-Version: 1.0
Content-Type: text/plain;
charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Microsoft Office Outlook 11
Thread-Index: AcZBxMbp3pklllG2TIyRhkP5Ax1cTQ==
X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180

To change this, all you need to do is;

  1. Download any binary editor, such as XVI32
  2. Unzip and run the binary editor
  3. Close Outlook to prevent any file locking issues
  4. Locate and back up the file: C:\Program Files\Microsoft Office\OFFICE11\OUTLMIME.DLL
  5. Open this file in XVI32
  6. Go to address C71A where you'll see the text "Microsoft Office Outlook 11"
  7. Change this to whatever you want
  8. Save the file
  9. Now send yourself an email and look at the headers!
You can see the headers by opening the mail, clicking on the 'View' menu, then clicking on 'Options'. Scroll down on the 'Internet Headers' pane to see your new X-Mailer!

MIME-Version: 1.0
Content-Type: text/plain;
charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Micro$oft Arse Mailer
Thread-Index: AcZBxMbp3pklllG2TIyRhkP5Ax1cTQ==
X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180
 I'll see how to change the X-MimeOLE: header next.

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