Microsoft has released an ultimate new email service where you can register email@example.com email address in less than a minute. A simple registration form and your outlook.com email is ready. The UI is ultimately simple and easy to use. There are no ads so far but we can expect sometime in future. There are plenty of space free to place ads by microsoft later.
It also has a complete integration of People (to add contacts from Facebook, Google, LinkedIn, Twitter and manual as well), Calendar and SkyDrive (Free Cloud Storage) feature.
The design of the site really makes anyone to start liking it and use it as well. 🙂