A Microsoft file hosting and synchronization service.
I concur with everyone's anger and, frankly, shock in this thread. I spent multiple hours this week trying to recover more than 100k work files--files I rely on for my job and use every single day--that had been deleted. This unannounced and poorly executed decision also removed all tags I had curated for the database that organized these files. They are forever gone, not just suspended in the cloud like the files themselves.
I'm still in a kind of disbelief that a company this large and this "professional" could be so unbelievably short-sighted. No exaggeration, this is a disaster. I simply cannot think of a bigger and more profound failure in my 40+ years as a prolific computer user.
It gives me no pleasure to say this but people should lose their jobs. This is how bad this is.