This si a great service, provided by one of the leaders in the IT industry – Apple Inc. iCloud is not only an e-mail service, buy the way you get your mail account as an addon when you sign up for iCloud. It’s a broad service, allowing its users to store all of their data on “The Cloud”, and easily access it via a mobile phone or a computer. You can read more and sign up for their services here: http://www.apple.com/icloud/
You can read more information exactly about their E-mail service here: http://www.apple.com/icloud/features/calendar-mail-contacts.html
You can easily take advantage of this great service, if you have a iPhone, iPad, iPod or a MAC PC.