Microsoft 365 Copilot can summarize documents, draft email and answer questions using your organization’s content. It does this using the permissions each user already has. That design is sensible, but it exposes a problem many organizations did not know they had: too many people can access too much information.

Why oversharing matters more with Copilot

Before Copilot, an overshared folder was a risk mainly if someone went looking for it. With Copilot, a user can ask a broad question and receive an answer drawn from any content they can reach — including a salary spreadsheet in a site everyone can access, or client files shared with “everyone except external users.”

Copilot does not create the permission problem, but it can make it visible very quickly.

Step 1: Find your overshared content

Review SharePoint sites, Teams and OneDrive sharing for broad access groups, “anyone” links and sites without active owners. SharePoint Advanced Management and Microsoft Purview provide reports that help, depending on your licensing.

Step 2: Fix permissions where the risk is highest

Start with sites that hold HR, finance, legal, health or client information. Remove broad groups, assign owners and set external sharing to the minimum each site needs. You do not need to fix everything before a pilot — but you should fix the most sensitive areas.

Step 3: Label and protect sensitive information

Sensitivity labels let you classify confidential content and apply protection that Copilot respects. Data loss prevention policies can help prevent sensitive information from being shared inappropriately, including through some AI interactions, depending on your plans.

Step 4: Run a focused pilot

Choose a small group with clear use cases — for example, summarizing long email threads, preparing first drafts of proposals or finding information across project sites. Record how long those tasks take today so you can measure the difference.

Step 5: Set clear usage guidance

Tell staff what Copilot is for, what it is not for and how to check its output. Make clear that people remain responsible for the accuracy of anything they send or decide.

Step 6: Measure, then scale

After the pilot, compare results with your baseline. Expand where the value is clear, and use what you learned to improve permissions and guidance before broader rollout.

Looking ahead: agents

Copilot Studio and Microsoft Agent 365 extend the same questions to AI agents: who owns each agent, what it can access and which actions require human approval. Setting good habits during your Copilot rollout makes agent governance much easier later. Learn more about our AI security and automation services.