Wondering how to look at an emails Headers for Outlook 2010 . Took me a while but figured it out eventually. Open the email that you received, click on the File tab and under the Info section click on the Properties. It shall give you the header information for that email. I am trying to figure out other means to display it by default no luck finding it, but google is my friend maybe someone else has found a solution.
Screenshot attached below just cause pictures speak louder than words or something of that nature.