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View the message source in Outlook 2003

Viewing email source is often useful in identifying spam, checking mail headers, etc.

Outlook doesn't have a "View Source" option like Outlook Express. It has a "View > Options" menu that only shows the message header only in a smallish text box, and it does not include the full message source.

You can view the message source in Outlook 2003 by creating a new registry key. If you access the mailbox using an Internet transport, you'll see the full source. Here are the simple steps to enable this:

1. Open the registry editor (Start > Run > type: regedit)
2. Navigate to: HKEY_CURRENT_USER\Software\Microsoft\Office\11.0\Outlook\Options\Mail
3. Right click on the right pane, create a new DWORD: SaveAllMIMENotJustHeaders and assign it value of 1

Note: This only works on new mail received after the registry key is created.

  User Reviews/Comments:
by anonymous - 2017-03-16 06:42
Right-click in the message body area, Click on View Source - shows you the full HTML code of the message in a separate window. At least it does in my version of Outlook 2003 in Windows 8.1 64bit
by anonymous - 2017-03-30 09:59
@OP : Thanks for the very useful information.
@PreviousAnonymousCommentator : Whilst you are right, viewing the html part of the email (formatted by outlook) has no relevance to wanting to see the whole unmodified source of the original email.
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