The Patterns & Practices team have just released the first part of the Windows Azure Architecture guide.
This book is the first volume in a planned series about the Windows® Azure™ platform and focuses on a migration scenario. It introduces a fictitious company named Adatum which step-by-step modifies its expense tracking and reimbursement system, aExpense, so that it can be deployed to Windows Azure. Each chapter explores different considerations: authentication and authorization, data access, session management, deployment, development life cycle and cost analysis.
You can view the guide online at http://msdn.microsoft.com/en-us/library/ff728592.aspx.
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