What if MS borrowed a MacOSX idea, and dropped there current OS.. just binned it.
then, took a *BSD or GNU/Linux OS, but instad of using GNOME or KDE, ported the vurrently existing windowsXP Desktop Envodonment to run on Xorg-x11.
They could build a portage free like what Gentoo uses, except with pre-compiled binaries.
Now you would have an OS which looked and felt exactly like Windows, except running on a BSD or Linux Kenrel and libraries.
Good bye securety issues and virus scanners, hello inherrant securety that comes with a true multi user envoronment.
THEN... Microsoft would work with the Wine / Cedeger project (which emulates windowsXP)
at the moment Wine and Cedeger are good, but they dont quite run all windows porgrams, and are not yet DirectX9 compatable.
IF microsoft gave the WIne hackers access to see, and use Windows source code, they would very quickly build a PERFECT emulator.
Also, MS could give the kernel hackers access to the windows kernel, and allow them to use parts of it.
armed with the window source code, the Linux and BSD kernel developers could build a compatability layer into linux / BSD that would allow Windows Drivers to work with Linux / BSD.
Windows software and drivers ould all work on linux.
HOWEVER.... Windows would keep its Graphical Desktop environment closed source, and not free.
this way MS could continue selling Desktop OS's similar to how MacOSX is sold.. the base of OSX is free, however apple makes its money by selling the graphical component of the OS.
OK, this is all just a dream... but is MS were so inclined, there is no reason this couldnt be done.
however im sure MS would never ever dream of doing this, maing windows and linux this compatable would almost certainly tempt windows users to have a look at 100% free desktop's like KDE, GNOME, NEXTSTEP BlackBox and so fourth.


