I do light Office 365 admin for a number of clients, always under Office 365 Business Premium subscriptions. I'm confused about encryption, that either does exist, or not, and where it does and doesn't.
I read the following link, and as is often the case, there's plenty about the technology, but nothing about where it is implemented, namely, which subscription level you need to get it.
So bottom line: if a small business under Office 365 Business Premium asks the question: "Is our email encrypted?", I find myself unable to be certain 100%. I do know it is encrypted in transit between email servers, and presumably it is encrypted from sender to the Office 365 servers, due to Outlook having that Security tab under Account Settings with a (greyed out) checkmark saying "encrypt data between Microsoft Outlook and Microsoft Exchange". If so, this means we're good from the sender, through to the far end of the Office 365 infrastructure, leaving only the recipient server and client end in question. Is that all correct?
Any pointers to a real description of this stuff and not the confusing (yet technically interesting) type of link as the one I put in above would be appreciated! :)