@MattSpeller what are Canadian laws like for email?
They don't care about the format, only what's in it. In our case, personally identifiable information (PII) - health data basically, height, weight etc.
PII must be stored in Canada - no exceptions.
This would be a lot easier if Google / Microsoft / anyone (omfg) had storage in Canada that complied with this (no external replication to USA etc).
Microsoft is starting one in Canada for this reason but they've yet to make it so that data can be isolated to Canada only.