In previous versions of Microsoft Outlook (the classic app), you could view the HTML code of an email by opening the email, right-clicking on it, and selecting “View source” from the context menu.

In case you missed it, Microsoft resurrected the old XML Notepad last year. The new version, XML Notepad 2007, is a .NET 2.0 application for which source code is available on CodePlex. I find it ...