I am not entirely satisfied with Thunderbird for a couple of reasons. It receives 30 to 50 items of spam a day whereas MS Outlook has displayed NONE so far this year. I am mystified by this. I am not at all suggesting the difference has anything to do with the clients themselves as I know it does not, but it gives me a major motivation towards switching my usage to Outlook. Secondly, I have read that Thunderbird has security issues and may be on the way out. I seem to recall that Computer Active has said it should be ditched.
As I understand it now, MS Outlook is the same thing as the Mail app. Different names for the same thing, or different things with the same name, is not exactly helpful. (In another thread I have drawn attention to the fact that there are now two quite different Edge Browsers in use. one of the not associated with Microsoft).
Having now examined Outlook.com there seems to be a case for using both the Outlook email programs in tandem, using Outlook.com to get rid of spam? I can do something like this (and should use it more) with BTYahoo Mail and the BTInternet Mail which is the main account I use for Thundirbird.
I will give that procedure for creating a Tiles for Edge a try, though I don't, and don't intend to, use Edge much yet until it has extensions.