[armored_mammal]

When I've been involved with a public university there are lots of disclaimers and notices that stuff done via University email is not private and isn't subject to requirements for a warrant should the institution want to review it, etc.

However, I would expect that Harvard, being a private institution, and desiring to make its faculty members feel secure, would adopt a standard that's more stringent with respect to institutional access, and that its members, feeling that they're part of the good ol' Harvard crew would feel as though there were an additional informal standard layered on top of any official policy.

In any case, I don't think public or private institutions are likely to treat email at all like private enterprises, and I'm not sure why one would think that is so.