What is the Windows Azure AppFabric?
Windows Azure AppFabric provides a comprehensive cloud middleware platform for developing, deploying and managing business applications, and extending the familiar way you build Windows Azure apps today. It enables you to bridge your existing applications to the cloud through secure connectivity across network and geographic boundaries and by enabling a consistent composition model for both Windows Azure and Windows Server. With AppFabric, Microsoft is delivering services that enable developers to build and manage composite applications more easily for both server and cloud environments.