Places where people don't actually use their computers for much of anything, and places that make **** loads of money and can get multiple fibre lines to an office.
Small business? No way, typical residential and commercial internet would not work for more than 1 user simultaneously, and would be horribly slow with just 1 user.
Don't believe me?
According to speedtest.net, I am in the top 75% of internet speed for Canada.
http://www.speedtest.net/result/2479658050.pngWhy would I want to move backwards in speed?
Big business? Why give away control to google if you can afford to control it yourself?
And finally, if I was going to dump Microsoft, I would go Linux or Apple, An online only OS is just stupid.