I admit I'm surprised and a little impressed that Microsoft is standing up like this for its users. I'm sure it would be easier for Microsoft to quietly hand over the data instead of standing up like this for their users' privacy. That being said, I wouldn't trust ANY of the major email services with any sensitive emails. I'd instead use a service like RunBox or some other encrypted email service with strong privacy policies.
I admit I'm surprised and a little impressed that Microsoft is standing up like this for its users. I'm sure it would be easier for Microsoft to quietly hand over the data instead of standing up like this for their users' privacy. That being said, I wouldn't trust ANY of the major email services with any sensitive emails. I'd instead use a service like RunBox or some other encrypted email service with strong privacy policies.