Since Azure Guest OS 1.2 both .NET 3.5 SP1 and .NET 4.0 are supported. The default version for the Azure Guest OS (currently @ 1.5) is .NET 3.5 SP1 and we have plans to switch to .NET 4 as the default framework at a future date.  As documented, there...

                  Code Contracts provide a language-agnostic way to express coding assumptions in .NET programs. The contracts take the form of pre-conditions, post-conditions, and object invariants. Contracts...

A new guide, "Getting Started with the Windows Azure CDN" , is now available to help you understand how to enable the Windows Azure CDN and begin caching your content. Included is a short list of prerequisites for using the Windows Azure CDN...