I have to say as someone who has used a hotmail account for YEARS this is very disappointing. The Windows 10 Mail App really sucks.
You can't sync all you email accounts at once. There isn't a contacts feature. And the list goes on.
It's like Microsoft goes out of it's way to alienate users. Remember the move to DeltaSync?
Does Microsoft understand there are many places where you can get a free email account?
Gmail provides IMAP or POP3 and so does AOL and they are far from alone.
I am getting sick of having to adapt to Microsoft's fickle nature.
I will start getting used to using Gmail I guess.
Microsoft why not WAKE up and start thinking about NOT PUSHING your users to your COMPETITORS!
And I was using hotmail since BEFORE Microsoft bought them!