[paganel]

Unknown unknown catastrophic failures like this one have always happened and will continue to happen, that's why we need resilience which, probably, means a less centralised worldview.

Which should probably mean that half (or more) of the Western business world relying on Outlook.com is a very wrong thing to have in place, but as the current money incentives are not focused on resilience nor on stuff like breaking super-centralized Outlook.com-like entities down means that I'm pretty sure we'll continue having events like this one happening well into the future.