Microsoft did it pretty easily because they have the financial flexibility to make a multi-billion dollar investment and already have a global enterprise sales

Microsoft did it pretty easily because they have the financial flexibility to make a multi-billion dollar investment and already have a global enterprise sales and support organization with a 20 year head start on the competition. Facebook can't say the same and getting 100 datacenters up and running would cost them 25 billion before hiring anyone -- that's more than half of their cash. I agree with you though that it makes zero sense for Facebook to do this.