They don't mind using free software in the servers or the code ^^ Same for browsers. People use tons of free software without knowing they do. It's not "selling" it's corruption, they got freebies / lobby bribes. In Europe, free software is used more and more. It only make sense.
Teue. That does not make transitioning to free (as in free speech) software an easy task. It is not impossible either, but requires more planning than simply discontinuing use of Microsoft and hiring a team of experts to manage the transition.
Obviously, it require work, but it's not that difficult. Start by using open-source formats, it allow to switch tools easily. There is nothing Microsoft does that can't be done without free software and it will probably be better done (MySQL, Linux, etc)