Atrocious. The fact that one of the ritches companies, and one of the biggest email services on earth, delivers norhing better than this, is highly unfortunate. The out of the box interface is pretty bad. If you want something pretty and intuitive, try something else. Neither the app, nor the website is well optimised for the end user experience. There are some basic customization functions for looks, but nothing that really changes how you use the app more designated to your needs. Also, ads?