It is clear that Microsoft have available a books, which are free to download. These books provide an introduction and detailed information on some of their enterprise nad development products. They include: windows server,Azure, .NET, etc. some of these books contain information with more technical detail than you will find in average IT manuals and books. These books are what you will not want to miss out if you are interested in them. Visit the Microsoft press site to see the list of books they have and download links for these books.