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There are multiple features that are missing since the App of Windows 10 Mobile is richer, let's give three examples:
1) Mark an e-mail as read from the notification.
2) Format e-mails, there is no way to change from plain text to HTML format.
3) No week view.
There are 2 missing options that I can see in the Windows 10 version:
1) Basic fonts formating.
This option I have seen it only in Blue Mail from Android.
2) Week view, it's too have the month view, but in a phone/table the week view is useful too, it used to be in Windows Phone too.
This topic even has been marked as completed in the past, at least some basic options like bold, italic, append an image, lists, colors or adding a table would be useful.