[pid-1]

Why would any enterprise use e2e encryption?

In most juridictions and industries you must be able to audit internal and b2b communication.

[Arathorn]

so that when someone pwns your chat server, they don't walk off with all your communication history.

If you want audit, you then add it on separately, in a separate locked-down deployment, compartmentalised from the rest of your infra and the chat server, so that an attacker would need to pwn an audit client connected to that instead.

[grahamj]

Might want to let Google know this

[qwery]

... So that the content of the chats isn't trivially read by unauthorised third parties?