Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Goods news for the global population - Microsoft has released two different operating systems: Windows 8 and Windows RT (Run Time) to decrease security risks. In addition to this, Windows Store applications are also tested and certified by Microsoft to be free of thousands of common fatal bugs and security problems. Consequently, this means that the millions existing malicious programs that target traditional Windows desktops will have hard times to convince endusers into running them. What is an operating system? According to engineers, an operating system is a collection of software that manages computer hardware resources and provides common services for computer programs. As a matter of fact, the operating system is an essential component of the system software in a computer system...