The Windows Azure platform AppFabric December release is live as of December 18 th 2009. This release includes improvements in stability, scale, and performance. Please refer to the release notes for a complete list of the breaking changes in this release
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Read the complete post at http://blogs.msdn.com/netservices/archive/2009/12/22/the-windows-azure-platform-appfabric-december-2009-release-is-live.aspx