After Microsoft pulled the ICC email servers every government, including my own in Canada, needs to drop Microsoft and US vendors ASAP.
Servers being located in Canada does not protect them from their certificates being revoked.
It doesnโt matter how disruptive and expensive that is, if all of your government organizations and military communication channels and documents go down overnight due to an executive order you are 100% thoroughly fucked.
This needs to happen asap because there are at minimum 3.5 more years of an administration willing to weaponize executive orders and tech companies obediently following them.