I'm no lawyer, but this is context-dependent. I have worked in companies where all emails not legally required to be retained longer were auto-deleted after 90

I'm no lawyer, but this is context-dependent. I have worked in companies where all emails not legally required to be retained longer were auto-deleted after 90 days, Zoom was auto-deleted after 24 hours, and getting any kind of persistent chat was an utter ass-pain, all because Legal was paranoid about liability.