From the source:

Mitch Tulloch has updated his very popular free ebook on Windows Server 2012 based on the RTM version of the software.

A key feature of this book is the inclusion of sidebars written by members of the Windows Server team, Microsoft Support engineers, Microsoft Consulting Services staff, and others who work at Microsoft. These sidebars provide an insider’s perspective that includes both “under-the-hood” information concerning how features work, and strategies, tips, and best practices from experts who have been working with the platform during product development.

Please see the links below to download one or all of the available formats.

PDF - Introducing Windows Server 2012 RTM Edition - PDF ebook

EPUB – Introducing Windows Server 2012 RTM Edition – ePub format

MOBI – Introducing Windows Server 2012 RTM Edition – MOBI format (for Kindle)

The full version can be bought here:

UK / Europe:

Kindle edition 

Paper edition

US:

Paper edition

Kindle edition (at the time of writing, the book is priced at $0.00)

SOURCE 

From the source:

Friends, the final and complete version of Introducing Microsoft SQL Server 2012, by Ross Mistry (@RossMistry) and Stacia Misner (@StaciaMisner), is now ready as a free download! You can download the PDF version of this title here (288 pages; 10.8 MB).

We will update this post soon with links to EPUB and MOBI files. We expect these files to be available by March 23. If you prefer a hard copy of the book, you can order it here for $14.99.

Introducing Microsoft SQL Server 2012 includes 10 chapters:

PART I   DATABASE ADMINISTRATION (by Ross Mistry)

1.   SQL Server 2012 Editions and Engine Enhancements

2.   High-Availability and Disaster-Recovery Enhancements

3.   Performance and Scalability

4.   Security Enhancements

5.   Programmability and Beyond-Relational Enhancements

 

PART II   BUSINESS INTELLIGENCE DEVELOPMENT (by Stacia Misner)

6.   Integration Services

7.   Data Quality Services

8.   Master Data Services

9.   Analysis Services and PowerPivot

10.   Reporting Services

Another MSDN-flash newsletter was send out covering various topics such as Windows Phone 7, PDC10, MVVM Light Toolkit for Silverlight and WPF and much more. If you want to subscribe to the MSDN-Flash newsletter (and all other available Microsoft newsletters), you can do so at the Profile Center.

Now, about the e-book:

The book is called “Moving to Microsoft Visual Studio 2010”, written by Ken Haines, Pascal Paré and Patrice Pelland. For more information about the authors, please check the original post on the Microsoft Press Blog. The book is divided in three parts: part I for developers moving from VS2003, Part II is for developers moving from VS2005 and part III is for developers moving from VS2008. You can provide feedback by filling out the survey on the Microsoft Learning site.

Download the book: PDF (18.2MB) / XPS (30.5MB)
Download the sample code

When cruising the MSDN-forums I found the following free e-book:

Introducing Windows Server 2008 R2, by Charlie Russel and Craig Zacker with the Windows Server Team at Microsoft.

Chapter 1    What’s New in Windows Server R2    1
Chapter 2    Installation and Configuration: Adding R2 to Your World    9
Chapter 3    Hyper-V: Scaling and Migrating Virtual Machines    25
Chapter 4    Remote Desktop Services and VDI: Centralizing Desktop and Application Management    47
Chapter 5    Active Directory: Improving and Automating Identity and Access    65
Chapter 6    The File Services Role    91
Chapter 7    IIS 7.5: Improving the Web Application Platform    109
Chapter 8    DirectAccess and Network Policy Server    129
Chapter 9    Other Features and Enhancements    147
Index    163

source (original MSDN post)

Download the e-book in XPS (28 MB) or PDF (11 MB).