In previous versions of Microsoft Outlook (the classic app), you could view the HTML code of an email by opening the email, ...

Paste the code onto a clear line of your email body to embed the call-me button within an email message. Save the email or Web page with the added code.

How to Add a Skype Button to Email. The Skype website offers the ability to generate buttons that initiate a voice call or instant message using the Skype client when clicked, but the code is ...