Use the following instructions to forward a message as a Multipurpose Internet Mail Extensions (MIME) attachment in Microsoft Outlook for Windows:

1. Open Outlook.
2. Navigate to the folder that contains the message you want to forward.
3. Hold down the Control key and click on at least two messages to highlight them.
4. Right-click on one of the highlighted messages, and select Forward Items.
5. A blank email will open with the selected messages as MIME attachments. Delete the additional message if only one message needs to be forwarded.

OR

1. Compose a New Email
2. Select the message you'd like to forward from the message pane.
3. Drag the selected message into the body of the new email.