Shame bout Mail for Win 10, its a nice layout as you say but thats about it, the rest is..... flakey
I use thunderbird but i loaded EMclient on my dads PC and he gets on well with it . search for it. its free.
PS ive had bad experiences with M$ Chat, they seem insistent on running a SFC/scannow (a check/repair on windows files) in the first instance regardless of what issure yo uare facing. Last time they did this to me I almost lost everything.