Tit wrote: Because you have to set up so much and enter your password every time - in Windows you just press "yes". Because my school licences Office and Windows to me for free.
I would guess that is the main reason
And you are correct in seeing that Linux OS and application developers are making good products, and often enough able to compete with commercial ones
--in schools I can think of Moodle as a classroom course management softwarehttp://www.turnkeylinux.org/moodle
It is very unfortunate for any other user than windows OS or Mac/OSX (waiting for latest office, at least they get a copy unlike the real competition Linux..) are almost being forced to use MS office suite because of market penetration and inertia from business that buy into the idea they must have an office suite
--most of the time for many businesses they don't really need such a big package to manage most of their office tasks