Markdown, once you get used to it, becomes muscle memory. I don't think to insert a link by highlighting text and clicking a toolbar button—I insert a link by putting square brackets around the text ...
I poked around in the (Japanese) help files on my install, and they appear to say "you can view complex HTML mail, but you can't make it." So you're basically stuck with the tools you get on that ...
In the old days, programmers primarily used Notepad to write code. The old days have long gone after the rise of more sophisticated coding tools for HTML and everything else, but despite that, many ...