Can we stop with the hyperboles and actually be realistic?
Quitting the use of Microsoft services won't really solve anything since, as has been made clear in other HN threads, the policies of other big players allow for the same (e.g. Gmail).
Arguing that "oh but Gmail hasn't actually proven they'll use this tactic" is absolutely absurd. They're saying they can, so nothing stops them from doing it tomorrow. If they really wouldn't ever do so then that clause would not be on any terms that users agree to. Ditto for all other major email providers.
Okay, so next we can say "aha! I'll just stand up my own email service!". Two reality checks...
--First: if you email anyone using a major email provider then you haven't really made much progress. Same even if they email you and you ignore them.
--Second: it seems completely unrealistic that this solution would scale to the entire world. NSA fiasco has proven to me that people value convenience more than privacy. Otherwise this "stand up your own email/cloud" trend would have started last summer. None of my friends (even tech friends) have switched away from gmail or whatever major provider they use.
This situation obviously sucks, but I don't see many reasonable responses to this. We're smart people here. Let's act like it.