How has the architecture model evolved with SQL Azure?
SQL Server is still the architectural foundation for SQL Azure. It is the language and protocol supported by the service endpoint that has changed. The flexible Authority, Container, Entity (ACE) data model has been replaced with a relational data model accessed by customer’s applications via T-SQL over TDS. This change delivers a familiar development experience for our customers currently using an on-premises SQL Server database, and in turn enables them to use existing knowledge, skills, tools, and applications.