Google Workspace, Microsoft 365, Notion and Confluence rent the document and the permission model. Nextcloud is AGPL-3.0 and holds the files. OnlyOffice Document Server is AGPL-3.0 and edits them in the browser. BookStack is MIT and is a wiki, which is the closer replacement for a subset of Confluence, not for Notion's application-shaped databases.
What does not come along?
Notion's databases-as-applications, and the live co-editing habits a team has built for a decade inside Google. OnlyOffice is a document editor. It is not a promise that every Sheet formula survives. Test the files that carry the business before the cutover, not after.
Where do files and chat meet?
Nextcloud can be the file store and the document host. Team chat is a separate decision, covered on team chat you rent versus chat you run. Do not buy one migration and assume it includes the other.
When should documents stay rented?
When the company is contractually inside Microsoft 365 and the only pain is one shared drive. Own the wiki and the archive if those are the records that cannot leave. Leave the everyday doc where people already work, if leaving would stop the work.
What do we hand over?
We select the system, deploy it on infrastructure you control, connect it to the tools you keep, and write the runbook so your own team can operate it. Support after handover is optional. The rest of the map is in software you can stop renting; the engagement behind it is open-source business systems.
Name one process that still needs a person. We will tell you what a one-time build takes.
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