Windows vs Linux: Architecture, part I

Linux is not a free version of Windows. The two systems differ not only visually, in the graphical user interface the user sees, but also functionally, as is frequently discussed, and legally to boot, which is constantly emphasized by the Free software community. The differences between them are so fundamental that drawing a comparison between them is nearly impossible. There are so many moot points that they could make up a very long list.
http://polishlinux.org/linux/windows-vs-linux-architecture-part-i/
http://digg.com/linux_unix/Windows_vs_Linux_Architecture_part_I