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This guide explains the current Microsoft rules for Copilot Chat and Microsoft Copilot, including the 50- and 300-reference limits, supported file types, permissions, setup steps, and the most common access problems.
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What Microsoft Copilot Notebooks does
A Copilot Notebook is a bounded collection of references for a project, subject, meeting series, course, or other body of material. Instead of asking Copilot to search everything you can access, you give the notebook a defined set of sources. Copilot then uses those references to ground its answers, summaries, plans, and other supported outputs.
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The boundary is important. Microsoft says Copilot does not automatically inspect your entire OneDrive, email, Teams chats, or the web. It uses references that have been added to the notebook and that your account is allowed to open. A notebook is therefore both an organization tool and a permissions boundary.
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Who can create a Copilot Notebook?
Personal Microsoft accounts
Microsoft lists Microsoft 365 Personal, Family, Premium, and Pro subscribers among the eligible users. Eligibility does not mean that every notebook capability is identical across those plans; Microsoft’s licensing matrix separates standard references, premium work references, and other features. Availability can also be phased, so an eligible subscriber may not see every capability immediately.
Work and school accounts
A work or school account needs an eligible Microsoft Copilot or Copilot Chat entitlement and a SharePoint or OneDrive service plan to create notebooks. The service plan requirement is separate from the Copilot entitlement. An organization can therefore assign Copilot Chat while still lacking the SharePoint or OneDrive service needed for notebook creation.
Administrators may also control access through organizational licensing, security settings, and permissions on individual files or sites. If the Notebooks entry is missing, confirm both the assigned license and the required SharePoint or OneDrive service before assuming the feature is unavailable.
Copilot Chat versus Microsoft Copilot
The two products do not have the same notebook capacity or source catalog. Microsoft’s 2026 licensing and reference guidance describes the following distinction:
| Area | Copilot Chat | Microsoft Copilot |
|---|---|---|
| References per notebook | Up to 50 | Up to 300 used for grounding |
| Standard documents and media | Supported | Supported |
| External URLs | Supported where the references guide permits them | Supported |
| Teams chats, meeting materials, SharePoint/OneDrive and other internal work references | Not listed as supported in Microsoft’s licensing table | Supported when the plan and permissions allow them |
| Work or school creation requirement | Eligible Copilot Chat license plus a SharePoint or OneDrive service plan | Microsoft Copilot license plus a SharePoint or OneDrive service plan |
The table describes Microsoft’s documented plan distinctions, not a guarantee that every tenant has the same rollout state. Licensing labels and feature availability can change, so check the entitlement assigned to your account when a capability is absent.
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How many sources can a notebook use?
Copilot Chat: 50 references
Copilot Chat supports up to 50 references in a notebook. Microsoft says all 50 are used for grounding when they are added successfully and remain accessible to you. A reference can be a supported file, page, media item, or URL, depending on the source rules for your account.
Microsoft Copilot: 300 references for grounding
Microsoft Copilot can use up to 300 references for grounding. The add-references guidance says you may be able to add more than 300, but only the first 300 will be used to generate grounded responses. Adding a 301st item therefore does not guarantee that it will influence an answer.
Shared locations are relevance-selected
When a shared SharePoint location is used as a reference, Microsoft says Copilot may select up to 300 relevant files from that location. Relevance selection is not the same as including every file. If a particular document must be considered, add that file directly instead of relying only on the shared location.
Which files and media are supported?
Microsoft’s reference documentation names these common file extensions:
.docxWord documents.pptxPowerPoint presentations.xlsxExcel workbooks.pdfPDF files.loopLoop components.pagepage files.txtplain-text files.rtfRich Text Format files- OneNote pages
Microsoft’s licensing table also lists JPEG and PNG images and MP4 video as media references. Whether a particular media type appears in your add-reference picker depends on the license and rollout applied to your account. A file extension alone does not override access permissions or plan restrictions.
Standard references
Copilot Chat can use standard sources such as documents, media, Copilot Pages, and external URLs where the reference guide supports them. Microsoft Copilot can use those standard references as well.
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Microsoft identifies additional work-oriented sources for Microsoft Copilot, including Teams chats, meeting materials, OneNote notebooks, and SharePoint or OneDrive content. These sources are subject to the precise plan, tenant configuration, and your permission to open the underlying content. They should not be assumed to work in Copilot Chat simply because both products can use ordinary documents.
What Copilot can access inside a notebook
Copilot uses references added to the notebook only when your account can access them. If a file is removed, moved behind a permission boundary, or shared without granting you access, Copilot cannot reliably ground an answer in it.
Microsoft’s official explanation is explicit: Copilot does not access your entire OneDrive, email, Teams chats, or the web, and it uses only the references added to the notebook to generate responses. This means that an email attachment or Teams conversation will not silently become notebook context. Add the relevant item through a supported reference path and verify that you can open it.
How to open Copilot Notebooks
Work and school accounts
Microsoft’s September 2026 getting-started instructions use the Microsoft Copilot web app at m365.cloud.microsoft.
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- Open the Microsoft Copilot app at
m365.cloud.microsoft. - Select Notebooks in the left navigation.
- If Notebooks is not visible, open the app launcher and look for it there.
- Alternatively, open notebooks from OneNote when that entry is available to your account.
Labels and placement can change during a gradual rollout. Missing navigation is therefore a reason to check account, license, service plan, and rollout status—not proof that your organization has permanently lost the feature.
Personal accounts
Sign in with the Microsoft account attached to an eligible Personal, Family, Premium, or Pro subscription and look for Notebooks in the Copilot or OneNote experience. If the notebook option is absent, confirm that the subscription is active and that the feature has reached your account.
How to add references
- Open an existing notebook or create a new one from the Notebooks area.
- Choose the command for adding references.
- Select the source category offered by your license: local or cloud files, OneNote content, a Copilot Page, media, an external URL, or an eligible work source.
- Pick the exact file, page, conversation, meeting material, site content, or URL you want the notebook to use.
- Wait for the item to finish processing, then confirm that it appears in the notebook’s reference list.
- Ask a question whose answer is clearly present in that reference and inspect the cited material or response grounding.
For important evidence, add the exact file rather than a broad folder or SharePoint location. A direct reference reduces the chance that relevance selection will omit the document.
Permissions determine whether a source works
Notebook membership and file permission are related but not identical. Being invited to a notebook does not automatically grant access to every linked document. The owner must have permission to share each file, and an invitee may need to request access to a file that was not shared with them.
Microsoft’s sharing FAQ currently says invited members receive editing access rather than a read-only role. Treat a shared notebook as a collaborative workspace, not as a view-only packet, and remove or relocate sensitive references before inviting someone.
For personal, Family, Premium, and Pro plans, Microsoft’s sharing guide says notebook sharing is unavailable. Those plans can still be eligible for notebook use; the limitation concerns the sharing function described in that guide.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What Copilot Notebooks cannot do
- It does not automatically search your complete OneDrive, mailbox, Teams history, or the public web.
- It cannot guarantee that every file in a shared location is used; relevance selection may choose only up to 300 files for grounding.
- It does not have one universal published maximum file size in the reviewed Microsoft documentation. Do not rely on an invented size threshold.
- Microsoft’s description says notebooks cannot create images or data visualizations.
- A source that your account cannot open cannot be used as grounded context, even if another notebook member can access it.
Common access and grounding problems
Notebooks is missing
- Check that you are signed into the intended Microsoft account, not a different personal or organizational profile.
- For work or school, verify both the Copilot or Copilot Chat entitlement and the SharePoint or OneDrive service plan.
- Use the app launcher and OneNote entry points described by Microsoft.
- Allow for staged rollout; Microsoft notes that some capabilities arrive gradually.
A file cannot be added
- Confirm that the extension is one of the documented types and that the file is stored where your account can open it.
- Open the file directly to test permission, then try adding it again.
- If the source is a work file, ask the owner or administrator to grant the required access.
- For a broad SharePoint location, add the critical document directly.
The answer ignores a document
- Check that the document appears in the notebook reference list and finished processing.
- Confirm that you still have permission to read it.
- Reduce ambiguity by asking a question that names the document or subject.
- If more than 300 references are present in Microsoft Copilot, remember that only the first 300 are used for grounding.
A collaborator cannot open a linked file
- Share the underlying file as well as the notebook, subject to your organization’s policy.
- Make sure you have permission to share that file.
- Tell the recipient to request access if the file remains restricted.
- Remember that current notebook invitations provide editing access rather than a read-only mode.
Choosing a practical setup
Small personal project
Use direct files, OneNote pages, Copilot Pages, and URLs that you can verify. Keep the reference list focused so answers draw from the material you actually intend to use.
Research set with more than 50 items
Copilot Chat’s 50-reference ceiling is the deciding constraint. Consolidate related material into supported documents, split the work into several notebooks, or use an eligible Microsoft Copilot plan that can ground responses with up to 300 references.
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Team project involving meetings and SharePoint
Microsoft Copilot is the relevant product when the workflow requires Teams chats, meeting materials, SharePoint or OneDrive content, or OneNote notebooks as premium work references. Confirm the tenant license and file-level permissions before building the notebook around those sources.
Shared deliverable
Plan sharing as a permissions exercise. Inventory every linked file, verify the owner can share it, and assume invitees can edit unless the current Microsoft controls change.
How to keep answers traceable
- Add the authoritative version of each document instead of several near-duplicates.
- Use descriptive file names and separate unrelated projects into different notebooks.
- Add must-use files directly when a shared location is involved.
- Check citations or grounding indicators in the response and open the referenced source.
- When a response matters, compare it with the original document; grounding narrows the source set but does not remove the need for review.
Bottom line for access decisions
Copilot Notebooks is available to Microsoft Copilot and eligible Copilot Chat users, with Microsoft 365 Personal, Family, Premium, and Pro also listed as eligible subscription contexts. Work and school creation additionally requires a SharePoint or OneDrive service plan. Copilot Chat supports up to 50 references, while Microsoft Copilot uses up to 300 for grounding and supports a broader set of work sources when licensing and permissions allow. Build notebooks around explicitly added, accessible references, and treat sharing and staged rollout as separate access checks.
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