I am now completely on Ubuntu apart from a couple of programs I can't get linux versions for (basically genealogy and Access database).
I may be able to solve those problems under Ubuntu: my brother has recommended Crossover which I will try as soon as I have time.
I have been running Ubuntu and Windows on different machines for two or three years (began with gibbon) but for the past year I ran Windows only for the above and for Thunderbird - I know, it took about 30 minutes to transfer it all to Ubuntu! :)
I agree MS is closing itself off. I've been running three Windows 2000 machines here for years (er... from 2000?) but they are now no longer supported (ie no security updates) and I would have to upgrade the hardware to install anything after XP. I don't intend doing that as the hardware works just fine!
Problem is: one of the Windows machines is used by my wife, and it could take a while to get her used to anything non-Windows-2000. :(