Tailspin Surveys is a multitenant, SaaS solution, targeting many different customers. Some of these customers might be “enterprise” with “Big-IT” and are likely to demand advanced integration capabilities for identity (e.g. identity federation). Others
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Read the complete post at http://blogs.msdn.com/b/eugeniop/archive/2010/05/24/windows-azure-architecture-guide-part-2-tailspin-surveys-authn-and-authz.aspx