This may also work for different versions of Outlook.
- Open the desired message in a separate window by double clicking on it.
- Once the message has been opened, select File at the upper left.
- Select on Properties
- You may now view the header information in the Internet headers box. I recommend highlighting and copying all the information and pasting it to a notepad document view easier viewing.You may now copy the text and paste to a text editor such as Notepad.