Last year, Microsoft released a huge batch of e-books for download in PDF format.  This was actually the second time the company had done so.  And now they've done it again, with a further release of more than 60 titles, downloadable in .pub, .mobi and .pdf formats.

You can find the latest batch, along with links to the previous sets, at 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?Redirected=tr

Note that these are mostly aimed at techies in the world of software development and business, and cover topics such as SharePoint, SQL Server, Lync and so on.  But definitely worth a browse.