Software Monoculture in Schools?

The World Is Not Microsoft asks: "I've been worried by changes my school has made over the past year or so to the general computer setup we have. The school is a City Technology College, and as a result of this there are an abundance of computers around the building which everyone is free to use. When I first started there (almost six years ago now) there were approximately even numbers of Windows and Mac machines. As happens over time these machines got out of date and had to be replaced, and the school has spent a lot of money buying replacements. What I'm bothered about is that when they did this they completely eliminated the Mac population, and by the time school starts again in September the only machines we will have will either be Windows 98 or Windows 2000. What's the situation like in other schools? Is everyone else completely locked into Microsoft like we are?" "There have been security problems with these systems in the past (mostly IE toolbars which requested content from sites which were blocked by the content filters, which caused problems for everyone), and with all the recent IE security problems I'm surprised that the people in charge aren't considering alternative systems (I know Linux would be too much to ask, but rolling out some OS X machines would be good). In addition to this, those who actually study ICT are required to use MS Office for spreadsheet and database tasks; no OpenOffice allowed."