Huge collection of Free Microsoft eBooks for you, including: Office, Office 365, SharePoint, SQL Server, System Center, Visual Studio, Web Development, Windows, Windows Azure, and Windows Server

http://blogs.msdn.com/b/mssmallbiz/archive/2013/06/18/huge-collection-of-free-microsoft-ebooks-for-you-including-office-office-365-sharepoint-sql-server-system-center-visual-studio-web-development-windows-windows-azure-and-windows-server.aspx