It is impossible to list down all the improvements in such a review. What we have done is to highlight the important differences that will benefit most if not all. Windows 2003 Server has evolved over time and it will definitely be here to stay. Of course, just like any new release of an OS, we would expect it to eat up even more disk space with features like Shadow Copy etc. I would say that this is an important feature which we will let the administrator decide if it will be used in the organisation. It is a nice feature to have on a file server.