Mattermost alternatives: migrate an active team conversation

For Mattermost alternatives, move a small working team with public and private channels.

• Test roles, guest access, notifications, search, threads, and file sharing.
• Rebuild one bot, webhook, or incident integration with least privilege.
• Export history and map what cannot migrate, including users and permalinks.
• Hold a real meeting or incident handoff using mobile and desktop clients.
• Run both spaces briefly and publish a clear cutover date.

A team chat succeeds when people can recover context and reach the right colleagues. Feature counts cannot show that.