Nothing fancy. 

Teacher writes to the founder of the Helios project "which brings Linux to school kids in Austin."

 "Mr. Starks, I am sure you strongly believe in what you are doing but I cannot either support your efforts or allow them to happen in my classroom. At this point, I am not sure what you are doing is legal. No software is free and spreading that misconception is harmful. … This is a world where Windows runs on virtually every computer and putting on a carnival show for an operating system is not helping these children at all. I am sure if you contacted Microsoft, they would be more than happy to supply you with copies of an older version of Windows and that way, your computers would actually be of service to those receiving them…"

"Starks pens an eloquent reply, which contains a factoid I have not seen mentioned before: "The fact that you seem to believe that Microsoft is the end all and be-all is actually funny in a sad sort of way. Then again, being a good NEA member, you would spout the Union line. Microsoft has pumped tens of millions of dollars into your union. Of course you are going to 'recommend' Microsoft Windows."

I'll leave the question of eloquence aside, but the screaming ad hominem circumstantial is something a Logic teacher with an exam to write must love.