I don’t know any of the alternatives that have similar UI to the Windows Mail app
But it is possible to get back the old Windows Mail app by obtaining the dumped package file for the app (either by looking for it online or leeching it from the official Microsoft Store website using store.adguard.ru) and then install it using Powershell
At least that’s what I do with one of my systems running Windows 10 LTSC, since that version of Windows doesn’t came with Windows Mail and MS Store pre-installed
As a guy who runs Windows 10 LTSC on one of the machine, yeah I agree it do suck ass
Not only it’s UI design doesn’t fit at all with overall Windows 10 UI design, it also runs significantly slower than the old Windows Mail app
And in the typical Microsoft fashion, they’ll shoved that garbage into everyone’s throat despite nobody ever asked for it
Fuck that