The Windows 10 mail app is a disaster. Why build an app that does not have the features of Windows Live Mail and then configure outlook.com so that Live Mail will not work after July
Yes.... Another great disaster.
I haven't even tried the new mail app, but as far as I understood :
1) Your email account info (if you setup one) may be used/accessed on the system level (by all apps and by windows). Maybe I am wrong, but that's what I understand. I don't really like that.
2) It is a UWP app and judging from the ones that were preinstalled and "functional" without me requiring to to login to a store, an email account or something, it shouldn't work either.
WLM was my favorite mail client (maybe it was a bit heavy being written in .NET and all, but it was quite good). It was so good that it even had features that Outlook has not.
Now WLM is totally destroyed (thanks to some MS "upgrade or die" campaign). I think MS must be ashamed for putting their name onto this piece of software. It just became terrible. It's hard to believe that someone could fit so many bugs and breaks into a single software "patch". It requires quite a talent...
Most probably, the team that originally made it works on something new and some team of newbies started meddling with it, in order to keep it alive. And here we are...