Of course they're innocent, but many business also can't afford nor want to employ people to host something like an email service for them.

I'd rather Microsoft host it for me than have to maintain a team of people with Microsoft Exchange skills running either on a cloud environment (similar issues) or on my own infrastructure.

I for one don't miss the days of Exchange going offline or having issues and being the person having to try figure it out.

Microsoft has much better reliability than MOST companies.