It's not just Microsoft and Amazon you need to worry about with this sort of thing. I'm sure we've all heard of (or even been affected by) the situations where a virus scanner decides a critical system file is dodgy after an update and bricks the machine. I've personally been involved in a situation where a colleague inadvertently wired up a network so it was looping back on itself, and then wondered why a broadcast storm disabled the whole thing! Simple errors like this having major knock-on effects has been happening for a long time--the difference being, once all your stuff is in the "cloud" you have no direct control over getting it fixed; you just have to sit on your hands while management get increasingly irate and you have no answers for them. That's one reason (and not the only one) why I don't believe in the Cloud and hope it never takes off as a concept.