Set up a VM in Virtual Box for them to use. Take a snapshot of when it was healthy and new and just revert to that each time someone wants to use it. Even paying for a Windows install for the VM would be cheaper than an iPad.
It's been a while but I don't think a circle and a parabola are topologically equivalent. If you remove a point from a circle it remains path connected, where removing a point from a parabola cuts it in two. I'm pretty sure a proof by contradiction can be sussed up wherein we assume a homeomorphism between the circle and the parabola and then look at that homeomorphism acting on the subset "circle - point" and "h(circle - point)" and find that those are clearly not homeomorphic.
In my high school, classes were about 42 minutes long. One year I got to experience Summer school and the classes there were an hour long. I found that the extra 18 minutes made a world of difference. I felt I was able to settle in, relax, and start learning better in an hour than in 42 minutes. After that I thought they should have less classes per day but have them be an hour long.
I've always felt it wasn't so much a matter of whether or not their needs are satisfied by Linux but whether or not their needs are unsatisfied by Windows. As you say, Windows just does what they need. So what would be the reason for them to switch?
While I appreciate that English is not everyone's first language, and I don't mean to "make fun," I cannot help but suggest that your post should have started with "Rorshach's Journal, March 26th, 2009."
I've been working 9/80 for the better part of 8 years now. It's fantastic. We actually have the ability to do 9/80 or 5/40 and switch back and forth whenever we like. I tend to do 5/40 in January and February just so I can go home when it's light out, but other than that I do 9/80. Two day weekends are not at all satisfying compared to three day weekends. You're off on Friday and you can run errands to anywhere you like, because everything is open, and then you can lay around on Saturday and just when you're thinking "man I don't want to go back to work" you realize it's Saturday night and you don't have to!
Last Summer I actually switched to the 4/40 and had every Friday off. I think I'll be doing that again this Summer. For me it's very much about getting to see the Sun when I leave work. In the Summer I can do a 10 hour day and still have a couple of hours of daylight when I get home.