Any communications where the user has an expectation of privacy (this includes company chat programs) should be securely stored (encrypted), and require a court

Any communications where the user has an expectation of privacy (this includes company chat programs) should be securely stored (encrypted), and require a court order to access, that goes through normal legal proceedings (e.g. in a criminal or civil case). It should not be legal for a random manager or company to access this data. The key here is expectation of privacy. If you're posting on a JIRA ticket, you have no expectation of privacy within those with access to the board, nor if you send an email as it can easily be forwarded (although that could be contentious). If you send a message through a DM on slack though, you can expect that to remain private indefinitely.