Slack to allow unpaid slacks to view messages older than 10,000 messages old sometime before 2020

Created by InquilineKea on 2017-02-07; known on 2021-01-01

• InquilineKea estimated 40% on 2017-02-07
• themusicgod1 estimated 49% on 2017-02-07
• Dapple estimated 20% on 2017-02-19

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