Message Priority And Starring

via “conversation-pinning-and-starring”

Unique: Supports pinning for both email and chat messages, allowing important emails to be pinned to a channel (which traditional email doesn't support). This requires treating email messages as first-class channel content.

vs others: More flexible than email (which doesn't support pinning) but simpler than Slack's saved items feature (which includes more metadata and search capabilities).

via “sender priority identification”