Eh, except that a huge number of Office users are there because their employers make them use it, and then use it at home because it's what they know. Not sure it's much of a choice for a lot of them.
Moreover, students are indoctrinated in MS Office from a young age, given the extent to which it's been baked into official curricula. The books that a lot of Indian students use are available online [1] and MS' stranglehold is very evident.