It's end to end encryption, as in, there are ends on each side where it is decrypted, usually for the humans to read. At the ends the records should have been maintained, the regulations aren't incompatible with E2E.
I'll respond to all three of you: yes it is difficult to retain all potentially work-related communications that take place on your employees' personal devices, so the alternative is to retain all communications.
It is absolutely incompatible with E2E encryption to mandate a third party access to one of the Es for surveillance purposes.
It is absolutely incompatible with E2E encryption to mandate a third party access to one of the Es for surveillance purposes.