And how much does the non-upgrade copy of Windows cost? I suppose kids could download an unregistered copy and use that for 90 days or whatever the period is,

And how much does the non-upgrade copy of Windows cost? I suppose kids could download an unregistered copy and use that for 90 days or whatever the period is, but that may not be enough to last the school year. No doubt schools won't encourage kids to use unlicensed software that they "borrowed" from somewhere.