You can convert HEIC files to the PNG format using a few different methods. Here's how to convert HEIC to PNG on an iPhone, ...

You can AirDrop photos as a JPG by manually converting HEIC to JPG or always saving in the JPG format.

If you are unable to thread MIME format emails, then the chances are Microsoft Outlook has mistranslated them. The good part is, you can modify them so that it can be read and displayed by your email ...