A large state corporation in Brazil is currently trialing 800 Linux PCs. If successful, it will deploy and replace 22k Windows installs, comparable to the migration happening in Germany.
What I predict will happen is that Microsoft will offer them Windows for free or bribe the relevant decision makers with free Surface Pro laptops (for "evaluation") or other Microsoft paraphernalia.
That's not how they do it, of only because it would tank Windows PR image as "free stuff".
What you do is arrange it with the government to alocate huge budget sums to purchasing Windows and other stuff from Microsoft at normal market value, then return half the money to the government officials under the desk in whatever form you care or can get away with, straight up bribes if you can swing it.
Microsoft gets to remain dominant, Windows appears to have been purchased at normal value and gets to keep its clout as fancy expensive stuff, and the decision makers get mad money out of it. Everybody wins.
I feel like free products just for decision makers sound like a straight bribe, and free Windows is still not even worth more then free and open source ...