I worked at an educational software company for a quite a while, dealing 95% with schools. I worked with their network administrators on a daily basis. Our software could run off a mac as well as a pc. I can asure that those schools that do have mac's either have old labs slated for replacement, or a lab full of "cute" imac's. As you can imagine, the cute imac's are despised, and attempts to add more labs of them usually get stopped with threats that the support staff will quit if they do.
Most of the mac's that do exist in schools are junior high schools (6-9) or earlier. Mac's in high schools at all are becoming a fairly rare thing. There are significant problems with a lab full of mac's that are not offset by the deep educational discount offered by Apple.
First, the school must buy a router to seperate the mac's from the rest of the network. If they don't, it kills the rest of the network with all of their chatter.
Second, the schools usually end up having to buy virtual pc and an additional copy of Windows. This can add a few hundred bucks per computer, and really ugly support and training problems.
Third, lack of economically viable aftermarket hardware. Schools often buy the cheapest thing that they can without the foresite to realize that this will nip them in the ass later on. It doesn't take too long before they realize exactly why 32 MB RAM vs 64 MB RAM really is a big deal. Than they go out and buy the aftermarket parts (I've taught a lot of schools to use pricewatch), not a cheap venture for mac's
Fourth, training costs of the students. By the time the students get to junior high, or at the latest, senior high, they realize that the real world does not use mac's. Save the flames, I know that advertising, publishing, and commericial art houses use them - still a very limited part of the pie. It takes time to get the students acclimated to a new os etc.
Fifth, software, limited availabilty, unlimited cost. When I sold computers, and people wondered if they should buy a mac (what the kids in elementry use), I would show them identical software packages for the pc and mac. I let them come to their own conclusions about availability and cost.
I'm not opposed to teaching kids Linux, I agree with your dual boot system idea. I just needed to cover the bit about mac's. Adults tend to have a popular perception about "Mac's in schools" and don't realize that it is years outdated. Incidently, those schools with old networks almost exclusively used Novell. Those with new networks, or looking to move to new networks almost exclusivly were looking at NT. A few schools were looking to run Linux servers as well. This was the exception, but I think will become more popular once training issues become more reasonable.
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