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With Outlook 2007 and 2010 interface changes, the path to locate the full headers for an email message has changed. I'll show you how I found them.
I'm on Outlook 2010. The example that you show for Outlook doesn't look like mine. There isn't an "option" when I right-click on an email. Is it possible to see headers using Outlook 2010?
It is, but it took me a few minutes to find it myself.
Outlook 2010 (and probably Outlook 2007 before it) went through a fairly major interface redesign compared to Outlook 2003 and earlier versions.
There may be better ways, but here's how I found the message headers.
This is one of the common default views that Outlook 2010 will start in. Naturally, you may have customized it to some degree (in fact, I hope you have, because I find this view particularly busy and inefficient).
Regardless of the view, you probably have a list of messages displayed. In the example above, that's the second of the four columns.
Double-click on the message of interest to open it in its own window.
With the message in its own window as shown, click on the File menu:
Click on "Info", and you'll see the elusive "Properties" menu item that we're looking for.
This doesn't appear to have changed too much.
At the bottom, you'll find "Internet headers:". Click anywhere in the headers, type CTRL+A to select them all, then type CTRL+C to copy them to the clipboard.
Then, open up Notepad or your favorite text editing application and paste them in (CTRL+V) for easier reading.