Can I configure 90 retention limit? Chat with > 90 day retention becomes my documentation and I don't want that.

That's a fair point! While we default to unlimited history (since the 90-day hard limit is a pain for most), we plan to let admins set custom retention policies. If you want messages to auto-delete after 90 days to keep things ephemeral, you'll be able to configure that. We don't want to force 'chat as docs' on teams who prefer it temporary.

Use Slack? The pitch here is minus that retention limit.