Microsoft 365 Copilot can use organizational content available to the signed-in user through Microsoft Graph, including files, email, calendar items, chats, meetings, and contacts. It follows that user’s existing permissions: it does not grant access to a file, mailbox, or meeting that the user could not otherwise view. What Copilot can retrieve also depends on sharing and discovery settings, protection rights, and the requirements of the specific Copilot experience.
How Copilot access works
Microsoft says that its Microsoft 365 Copilot grounding process accesses only content the current user is authorized to access. In Microsoft’s words, Copilot “only surfaces organizational data to which individual users have at least view permissions.” Microsoft’s privacy documentation describes this permission boundary.
That boundary is not a separate permission system that overrides Microsoft 365. Copilot does not make a user a member of a SharePoint site, open a mailbox they cannot access, or grant rights to a meeting transcript. Existing access determines what the user is eligible to retrieve; service settings and the particular Copilot feature determine what is discoverable and available in the response.
What Copilot can access by content type
Files in SharePoint and OneDrive
Copilot can summarize or refer to a SharePoint or OneDrive file when the signed-in user is authorized to access it. Site membership, sharing permissions, and discovery settings influence whether Copilot can find and reference an item. As a result, two people asking the same question may receive different answers because they have different access or because content is discoverable in one context but not another.
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Protection can impose an additional limit. Microsoft’s data protection and auditing guidance says that a user needs the applicable EXTRACT and VIEW usage rights for Copilot to interact with encrypted content. Some user-defined sensitivity-label permissions can prevent a Copilot agent from extracting or interacting with a file’s contents.
Email and mailbox data
Experiences that use email, calendar, meeting, or other mailbox data require an Exchange Online mailbox. Microsoft documents support for a user’s primary Exchange Online mailbox and content the user is permitted to access in archive, shared, and delegate mailboxes. Group mailboxes are not supported. Availability of a particular mailbox-grounded feature can also depend on the app, license, and tenant configuration. See Microsoft’s Copilot requirements for the documented prerequisites.
Meetings and calls
Meeting content is one type of organizational context that may be available to Copilot. For Copilot to refer to Teams meeting content after the meeting ends, Microsoft says transcription or recording must be configured. Teams Phone call content likewise requires transcription or recording; participants receive the applicable notice. This does not mean that every live meeting, past meeting, or call has content available to every Copilot experience. The meeting’s capture settings and the feature’s requirements matter.
What determines whether an authorized item is available
Permission to view an item is necessary, but it may not be the only condition for Copilot to use it. The practical checks differ by content type:
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| Content | Access boundary | Additional conditions |
|---|---|---|
| SharePoint or OneDrive file | The user must have permission to access the file. | Sharing and discovery settings affect whether Copilot can find it. Encrypted content requires applicable EXTRACT and VIEW rights; some sensitivity-label permissions block agent interaction. Microsoft documentation. |
| Email and mailbox data | The user must be permitted to access the mailbox content. | An Exchange Online mailbox is required for mailbox-grounded experiences. Primary mailboxes and permitted archive, shared, and delegate content are documented; group mailboxes are unsupported. Microsoft requirements. |
| Teams meeting after it ends | The user must be authorized to access the relevant meeting content. | Transcription or recording must be configured for Copilot to reference post-meeting content. Microsoft requirements. |
| Teams Phone call | The user must be authorized to access the relevant call content. | Transcription or recording must be enabled, with the applicable participant notification. Microsoft requirements. |
Prompts and responses are not training data, but interaction records exist
Microsoft says prompts, responses, and data accessed through Microsoft Graph are not used to train the foundation large language models used by Copilot. That does not mean nothing is stored. Microsoft documents interaction records that can include the user’s prompt, Copilot’s response, and citations to the information used to ground the answer; interaction data is encrypted while stored.
Administrators can use Content Search or Microsoft Purview to view or manage stored interaction data and its retention. Microsoft’s privacy and data documentation describes these records and the training-data distinction.
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What Microsoft 365 administrators should review
Because Copilot uses content that a user is already authorized to access, a broad or outdated permission structure can affect what that user can retrieve. Microsoft’s security and governance guidance identifies controls organizations can use to govern Copilot and agent use. Administrators should consider:
- Reviewing SharePoint and OneDrive access and oversharing, including site access reviews.
- Using restricted content discovery where appropriate to limit what Copilot can find.
- Applying sensitivity labels and data loss prevention controls to content that needs additional protection.
- Using audit, retention, and eDiscovery capabilities to meet organizational compliance needs.
- Checking Microsoft 365 licensing and tenant configuration before relying on a specific control or experience; Microsoft distinguishes foundational and optimized governance capabilities by entitlement.
These measures govern the content and experiences available to users; they do not turn Copilot into a way to bypass the underlying permission model. Organizations should confirm current entitlements and settings in Microsoft’s documentation before planning a control rollout.
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