Because the whole history of Microsoft is based on the EEE paradigm. And now because of inertia it's almost[0] impossible to move away from it for any org that has been using their products for years.
[0] "Almost", because I know some large orgs that finally managed to break away, but it wasn't easy at all.
[0] "Almost", because I know some large orgs that finally managed to break away, but it wasn't easy at all.