Yahoo! Mail is an official email app for Yahoo Mail by Yahoo! that made for Windows 10.
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Stationary is an add-on that's only available in Yahoo! Mail. It allows users to customize and enhance the look of the email. Things like image borders, letter style etc. can be changed before sending the email to intended recipients.
Pro Background wallpaper
Similar to Mail app bundled in Windows 10, Yahoo! Mail allows users to set images from Flickr as the background image for the app.
With this Yahoo! Mail feature users can open any e-mail in a new tab and get back to the mail list without having to close the e-mail that the user is currently reading.
Con Only supports Yahoo! Mail
Because it's a mail app developed by Yahoo!'s, it only supports Yahoo! Mail accounts.