Is it possible to apply rich text (bold, different words and background colours, underline, underscore list etc.) on Task notes on Windows, Android and IE platform?
I also would like to know
Task notes does support formatting to an extent. You can set text in bold, italic, and create links. Here's a page that shows you how to do that. https://todoist.com/Help/TextFormatting
Aside from these though, other formatting options are not supported yet but we may add them in the future.