Reference: Windows Azure SDK supported versions

You must have installed Windows Azure SDK for .NET for the Visual Studio version that you are using. It includes Visual Studio Tools for Azure and Azure SDK.

Depending on the Sitefinity CMS version you are using, you must install the following version of Windows Azure SDK:

Sitefinity CMS version
Windows Azure SDK
10.0 to 12.1 2.9.6
8.1 to 9.2 2.6
8.0 2.2
7.0 to 8.0 2.2
5.2 SP1 to 6.3
5.1 to 5.2

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