Channels, threads & search
How this is scored
The daily surface: channel model, threading, mentions, files, and whether search can find a decision made eighteen months ago.
0 — Flat group chats with no threads; search covers recent messages only, and history is capped.
3 — Channels and direct messages with basic search, but threading is awkward or absent and file handling is a plain attachment list.
5 — Public and private channels, real threads, mentions and reactions, file sharing with previews, and full-text search across the whole history.
8 — Cross-organisation or guest channels with clear boundaries, message editing history, pinned and saved items, search with filters by channel, person and date, and a documented history limit or none at all.
10 — The archive is a working knowledge base: search that ranks well across years, threads that stay readable, channel lifecycle management (archive, rename, merge) without losing history, and export of a conversation in a form a human can read.
The Security Officer
Search is the strong part: it covers posts, files and chat messages with author, date, label and hashtag filters, a keyboard shortcut, and archived posts stay findable under an (Archived) label. But chat is a flat, participant-only room model with one fixed administrator, message editing configurable from fifteen minutes to no limit with no edit history shown, and we found no public information on threads, mentions, pinned or saved items — and the documentation states chat history is not included in any export, so no conversation leaves in a form a human could read. 1 2 3 6