I'd have to check my US law, but I'm pretty sure that a major corporation encrypting its internal emails and then trying to claim to a court that it can't produ

I'd have to check my US law, but I'm pretty sure that a major corporation encrypting its internal emails and then trying to claim to a court that it can't produce documents under warrant because they're encrypted doesn't let the e-mail owners "win..." It gets them thrown in jail for contempt of court. If you want some evidence to back that hypothesis: the e-mails you're talking about right now are encrypted. They're encrypted inside Google's servers. But it doesn't matter in the face of a court order. It's not like the Justice Department accessed these files that are being reported on with wireshark.