@anarchic_teapot
You can do that, but it will cost you :-) IBM has a machine with lots of CPUs that each can run AIX, Linux or some other system available for it.
The thing is, that Linux and *BSD really should be used by people who do not need the software available for Windows, or for servers. I'm getting tired of all those who install Linux on their machines saying that it beats Windows and it is so much better and it is free yada-yada-yada.
I've worked on companies where they used Linux on all their workstations, which was fine for development. But we still needed some Macs for the Art Directors and the odd Windows box for reading the documents from customers (Word, Excel etc.)
As long as Microsoft has the "monopoly" on office software, the above situation is not going to change.
But Microsoft are getting scared - why? Because all the server manufacturers have started to ship machines with Linux. Even HP have made their own Linux distribution (with a lot of extra tools which makes it rather expensive). And I don't believe Microsoft could ever be as cost-effective as Linux. A friend of mine runs Debian on an old Pentium 233 MHz (not a PII) with 128 megs of RAM. This machine hosts 22 domains with a lot of sub-domains, MySQL, Apache, Sendmail, eggdrops etc. with thousands of visitors a day and a never-ending MySQL querying. Currently it has been up 87 days with a load average well below 1.
Try that with the same hardware but with only Microsoft products and see how it goes...