Microsoft is becoming a services company. They want to sell you a yearly subscription to the office 365 service, and it makes sense to provide that service on a

Microsoft is becoming a services company. They want to sell you a yearly subscription to the office 365 service, and it makes sense to provide that service on all platforms people use. You can't make an omelet without breaking any eggs. Microsoft knows that windows will not be ubiquitous, so they are choosing for a smaller slice of a bigger market instead of a lock-in on a shrinking market.