This is impossible because Linux killed Microsoft in 2003. We all know that. It was predicted confidently.
Linux wasn’t anywhere near viable for widespread desktop use in 2003. However, 2009 is another story. There are distros (Mint in particular) that install and set up everything for the end user, including stuff like Flash and media codecs without any headaches.
The popularity of cross-platform open source applications like Firefox, Thunderbird, etc. make it much less of an issue to make a switch.
And frankly, I find Linux much easier to use. Everything in Windows requires memorizing or Googling some nonsensical method of navigating through a maze of windows. I find Linux much more straightforward.
To each his own, but as I said, as the cross platform applications gain popularity, so too will the willingness of end users to switch to Linux or Mac if they’re rolling in dough for designer hardware.