How do I view source in Outlook 2010?
Open the email on the Message Ribbon and go to Move > Actions > Other Actions > View Source
It invokes Notepad and shows the full html source.
Double click on the mail, this will open it in a new window.
After that, then click on File > Properties. You will be able to see the header information from there.
For the "view source", right clicking on mails that have a source will by default open it in notepad.
For mails that aren't formatted (in HTML etc), the "view source" option will be greyed out.
In 2010 you do the following: (step ONE is very important)
Open the email...
( do NOT try to add the command at the top level of outlook, it will NOT show "view Source")
Right Click the ribbon -> Customize Ribbon
Select All Commands (since you are on an email, the "view source" will show)
Select "View Source" in and drop it in a new Group.