On: EU Chatcontrol 2.0 [video]

[radicalbyte]

Slack has a premium version which explicitly allows this: your employer can export ALL messages, including your private messages.

[chronogram → radicalbyte]

I imagine every work communications platform has such a feature since before email.

[aftbit → radicalbyte]

Good to mention it, but IMO generally assume anything issued by or associated with your work is owned.

[kfprt → aftbit]

Write everything at work as if it were going to be read by a judge.