Looking through the wikibooks website for a “in’s and out’s of Windows guide” and came across this -> LINK
The reason Microsoft created the new OS was because people who used Windows XP wanted it to be better, with more features and an easier to use interface. Also, new technologies were being created (e.g. HD and HD Disks) and computers needed to keep up with this. Another reason would be that, as any other business, Microsoft needed a new version of their product so that they could have more income for their profits.
A genius obviously wrote it. (-:
