Aquí tenemos una excelente recopilación de libros digitales de tecnologías de Microsoft absolutamente Gratis.

Dentro de los tópicos que pueden encontrar están:

•  Office & Office 365
•    SharePoint
•  SQL Server
•  System Center
•  Visual Studio
•  Web Development
•   Windows
• Windows Server
• Windows Azure

Y específicamente en Azure tenemos:

• Autoscaling Application Block and Transient Fault Handling Application Block Reference
• Create Your First Application: Node.js and Windows Azure
• Developing Multi-tenant Applications for the Cloud on Windows Azure (3rd Edition)
• Drupal on Windows Azure
• Exploring CQRS and Event Sourcing: A journey into high scalability, availability, and maintainability with Windows Azure
• Migrating Data-Centric Applications to Windows Azure
• Moving Applications to the Cloud on Windows Azure (3rd Edition)
• Using Windows Azure Mobile Services to Cloud-Enable your iOS
• Using Windows Azure Mobile Services to Cloud-Enable Your Windows Phone 8 Apps
• Using Windows Azure Mobile Services to Cloud-Enable your Windows Store Apps in C#
• Using Windows Azure Mobile Services to Cloud-Enable Your Windows Store Apps in JavaScript
• Windows Azure and SQL Database Tutorial

La lista complete pueden revisarla en el siguinete link:

Huge collection of Free Microsoft eBooks