On this landing Page you get a lot of MS Press Books for free. You can get books for IT Professionals with some Dev Books:
- Introdusing Microsoft System Center 2012 R2
- Introducing Windows Server 2012 R2
- Introducing Windows Azure for IT Professionals
- Rethinking Enterprise Storage: A Hybrid Cloud Model
- Introducing Windows 8.1 for IT Professionals
- Microsoft System Center: Designing Orchestrator Runbooks
- Microsoft System Center: Configuration Manager Field Experience
- Microsoft System Center: Cloud Management with App Controller
- Microsoft System Center: Troubleshooting Configuration Manager
- Microsoft System Center: Optimizing Service Manager