List will be updated as new books become available.
Free eBooks from Microsoft Press
From technical overviews to drilldowns on special topics, these free ebooks are available in PDF, EPUB, and/or Mobi for Kindle formats, ready for you to download.
Almost 150 FREE Microsoft eBooks
Eric Ligman list on MSDN:
Almost 150 FREE Microsoft eBooks, covering Windows 7, Windows 8, Office 2010, Office 2013, Office 365, Office Web Apps, Windows Server 2012, Windows Phone 7, Windows Phone 8, SQL Server 2008, SQL Server 2012, SharePoint Server 2010, SharePoint Server 2013,
Books for IT Professionals
Luigi Bruno list on Wiki.
This page is intended to be an alphabetically ordered list of suggested or recommended books for IT professionals, both mentioned on TechNet Wiki pages and outside.
E-Book Gallery for Microsoft Technolgies
Monica Rush list on TechNet Wiki.
Download content for ASP.NET, Office, SQL Server, Windows Azure, SharePoint Server and other Microsoft technologies in e-book formats. Reference, guide, and step-by-step information are all available. All books are free. New books will be posted as they become available.
Free e-Books for Windows Administrators
Michael Pietroforte list on 4sysops.
This is a list of free e-books what are useful for Windows Administrators. It will be regularly updated.
PowerShell Book Guide
Windows PowerShell Booklist on PowerShell.org
Free Books from MS Press
Mitch Garvis list.
Couple of Hyper-V Books for Virtualization Administrators
Mark Ghazai list on TechNet.
Top 10 Free Microsoft eBooks
Michael Otey list on WindowsITPro.
These ebooks cover IT topics such as Windows Server 2012, SQL Server, SharePoint, Exchange Server, Office, and development. Most of these ebooks are available in PDF, and some are also available in EPUB and MOBI formats. Here are 10 of the top (free) Microsoft ebooks.
The lineup of Windows Server titles from Microsoft Press. They offer reference and training for core skills as well as exam preparation.
"The best books on Windows Server 2012 and IIS 8.0 web server, books for IT professionals, system administrators and DevOps. Topics include installing and configuring Windows Server 2012, Windows Server 2012 R2, exam 70-410, 70-411, IIS 8.0, IPv6, PowerShell, deployment and Active Directory."