Re: Downtime?
Schools don't exist in isolation, or at least they don't in the UK, they are part of a local authority which are massive organisations, for instance the LA I work for, has something like 25,000 users, so not too sure why any school would have it's own email server. Prior to the cloud their email server would have been in a council computer centre somewhere. And yes there can be local outages, but there is usually a backup server, or traffic can be rerouted, whatever, my point being there are options. With the cloud all that is out of your hands. It's like the difference between driving and flying, at least when you're driving you are in control.