What they said. :) It did also specify in the scenario that internal email was unaffected.
Been using a cloud email service for so long I'd forgotten that Exchange existed :getmecoat:
To bring this back on topic, you might want to look at BYOD and whether the school is implementing it/thinking about it/already has it.
Also, check whether they have a VLE in place, or any kind of home access to student work or school files and programs.