Introducing Windows Server 2012 (RTM Edition) from Microsoft Press by Mitch Tulloch with The Windows Server Team has been updated now for the RTM edition. This very popular Microsoft Press book is free to download.
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.
You can download a free copy of the ebook in various formats -
PDF - Introducing Windows Server 2012 RTM Edition - PDF ebook (17.7MB)
If you want a hard copy of the book, it can be purchased from O’Reilly for $14.99
(Source: Microsoft Press Blog)