Here is Microsoft's introduction to Sql Azure Database in the cloud.

Microsoft SQL Azure Database is a cloud-based relational database platform built on SQL Server technologies. By using SQL Azure, you can easily provision and deploy relational database solutions to the cloud, and take advantage of a distributed data center that provides enterprise-class availability, scalability, and security with the benefits of built-in data protection and self-healing.

http://msdn.microsoft.com/en-us/library/ee336230.aspx

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