Export channel messages from Teams for Slack CSV import

08 may 25Zeno Popovici
  1. Create an Entra App in App Registrations.
  2. Go to API permissions and give all the necessary permissions via Microsoft Graph. Some permissions might be superfluous. You’ll figure it out. :)
  3. Generate a client secret and store it somewhere safe — you only see the value once.
  4. From a terminal, exchange the client credentials for a Graph access token, then call /teams/{team-id}/channels/{channel-id}/messages?$top=50 and page through @odata.nextLink until you’ve drained the channel.
curl -X POST "https://login.microsoftonline.com/$TENANT_ID/oauth2/v2.0/token" \
  -H "Content-Type: application/x-www-form-urlencoded" \
  -d "client_id=$CLIENT_ID&client_secret=$CLIENT_SECRET&scope=https://graph.microsoft.com/.default&grant_type=client_credentials"
  1. Map each message to a Slack-compatible CSV row: timestamp,user,channel,text. Slack’s importer is forgiving — keep the columns simple and it ingests.
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