The system is neat: Once administrators turn it on, emails that are sent are encrypted before they are fired out, meaning that they only leave the house after they put a jacket on. The recipient receives an email that has an encrypted attachment. That’s the message.
The attachment opens in a browser window, and the recipient authenticates themselves with either their Microsoft or Office 365 account.
It’s a hack, but far easier than PGP/GPG systems, and at the end of the day any encryption is better than none. Coming early 2014 Microsoft says.
The big question: how do we know the NSA hasn’t forced Microsoft to add a back door into this, or otherwise compromise the system? Without assurances on that, why bother?