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.

You can open MIME emails or attachments in Outlook using this tip, or by using a mime file viewer (.mim) or an online tool.

I have this problem on some outlook machines. We have a standard HTML signature that users send out with emails. Well some peoples signature appears as code. I can use word as the default email ...