Re:Slack Said to Draw Interest from Amazon
by Cthulhu_ on Thursday June 15, 2017 @11:16AM
(#14561149)
You can go back through all of history in all Slack conversations as long as you pay the subscription fees, so yes. I'd expect Slack to put older conversations into cold storage too.
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They do store a complete history of messages for non-paying teams. You can test this by paying for a month of Standard on a team that is really old; the conversation history will immediately expand backward until the beginning of time. Stop paying and you're limited again.