Please look into these stories: 

http://www.sd73.bc.ca/district-operations.php/page/linux-in-education/

http://www.linux.com/articles/62285

http://searchenterpriselinux.techtarget.com/news/article/0,289142,sid39_...

http://www.itinfusion.ca/linux/school-district-ditches-windows-for-linux...

Also look at entire public school systems, governments, and big businesses switching to Linux: 

http://en.wikipedia.org/wiki/Linux_adoption#Government

http://en.wikipedia.org/wiki/Linux_adoption#School_and_education