Outlook 2010 lets you easily forward a complete mail as an attachment, it comes helpful in a situation when you need to show the complete mail body, subject, and other items embedded into the mail. This post covers how to forward email as an attachment.
Select an email you want to forward, right-click the selected email and from More Actions, click Forward as Attachment.
It will open a mail compose window with selected email attached. Now enter the recipient email address and click Send.