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by rilindo 881 days ago
IIRC, slack archive by default, you don't have access to previous messages after a certain point unless you pay for the service.
1 comments
lxgr 881 days ago
Messages older than 90 days are only hidden in the free plan, not deleted: https://slack.com/help/articles/7050776459923-Pricing-change...

As soon as you start/resume paying, you can access them again.

link