Treat governance as an operating practice
Collaboration grows through everyday decisions: someone creates a team, shares a document, or invites an external colleague. Over time, those decisions become an information architecture—even when nobody has designed one. A useful governance program makes the important decisions deliberate without turning every request into a committee meeting.
Start with a small set of business questions. Who is accountable for each workspace? Who should have access? What information belongs there? What event triggers a review? The answers should be understandable to a department owner as well as a Microsoft 365 administrator.
Give each workspace an accountable owner
An owner is a business role, not simply a permission assigned during provisioning. Define who can approve membership, review external access, and decide when a workspace has reached the end of its useful life. Establish a backup owner and a process for transfers when employees change roles.
Microsoft provides an ownerless-group policy for Microsoft 365 groups and Teams. That capability can help identify new owners, but it does not replace a clear responsibility model. Review ownership as part of normal business changes, rather than waiting for an abandoned workspace to become a support problem.
Match sharing rules to the work
A project involving external advisers may need different controls from an internal finance workspace. Map a few common collaboration patterns and agree on suitable defaults for each. Consider guest access, link settings, information sensitivity, and the effort required for business owners to review access.
Avoid a single exception-heavy policy that nobody can explain. Record why each pattern exists, who can authorize a deviation, and when exceptions expire. Technical enforcement and user guidance should tell the same story.
Design the full lifecycle
Creation is only the beginning. Decide what happens when a project closes, a team merges, or a workspace becomes inactive. Distinguish archiving a collaboration space from retaining information for a business or legal requirement. Retention decisions should involve the people accountable for records and obligations.
Build a simple lifecycle register: workspace purpose, owner, access review date, expected duration, and disposition decision. Start with a representative set of spaces before expanding. The aim is a repeatable operating process, not a perfect inventory that becomes outdated immediately.
Make the next review easy
For a first governance review, choose one department and a manageable sample of Teams and SharePoint sites. Identify missing owners, unexpected sharing, duplicated workspaces, and information without a clear home. Prioritize fixes according to the sensitivity of the information and the business impact of disruption.
Finish with decisions, not just findings. Assign an owner to each action, define what evidence closes it, and schedule the next review. Governance becomes sustainable when the operating team can repeat it without reconstructing the reasoning behind every rule.