OTOH... I remember an O365 outage in London a few years ago.

You're down? Great, so are your competitors, your customers, and your suppliers. Head to the pub. Actually, you'll probably get more real value there, as your competitors, customers and suppliers are at that same pub. Insurance multinationals have been founded from less.

That didn't affect any OT though, so it was more just proof that 90% of work carried out via O365 adds no real value. Knowing where the planes are probably is important.