Microsoft Virtual Academy provided the free e-book in the various format (Pdf,EPUB file, Kindle file) on latest technologies like window Azure,Microsoft System Center 2012,Windows 8.1 and many more.
http://www.microsoftvirtualacademy.com/colleges/ebooks#?fbid=MoaLTwXvzhK
Rajesh Patel
R.P.A Developer | Developer Trainer | Clean Code Evangelist