The fourth edition of this book differs from the third edition in numerous ways.
There are large numbers of small changes everywhere to bring the material up to
date as operating systems are not standing still. The chapter on Multimedia Operating Systems has been moved to the Web, primarily to make room for new material and keep the book from growing to a completely unmanageable size. The chapter on Windows Vista has been removed completely as Vista has not been the success Microsoft hoped for. The chapter on Symbian has also been removed, as
Symbian no longer is widely available. However, the Vista material has been replaced by Windows 8 and Symbian has been replaced by Android. Also, a completely new chapter, on virtualization and the cloud has been added. Here is a