Copilot Notebooks vs OneNote Notebooks: What’s the Difference?

Copilot Notebooks and OneNote notebooks are now closely related, but they are not the same thing. If you have been wondering which one to use for a project, the short answer is that they do different jobs.

Microsoft has recently integrated Copilot Notebooks directly into OneNote, so you can create and use them from within OneNote as well as from the Copilot app.

The simple explanation

OneNote notebook: where you store and organise notes, sections and pages.

Copilot Notebook: an AI workspace that collects files, notes, chats and references so Copilot can reason over them and answer questions based only on those sources.

Note: Copilot Notebooks is available to Microsoft Copilot and Copilot Chat licensed users. Accounts need a SharePoint or OneDrive license (service plan) to create notebooks. It is also available for Microsoft 365 Personal, Family, Premium and Pro subscribers.

How they link to OneNote

A Copilot Notebook can use OneNote pages, Word documents, Excel workbooks, PowerPoint files, Copilot chats and pages, OneDrive files and folders, SharePoint content and web links as reference material.

You build a collection of references, then ask questions such as "Summarise all my project notes", "What action items appear across these meeting notes?" or "Draft a project plan using these documents."

Copilot answers using the material you have added to that notebook, rather than searching everything it can access.

Watch: Copilot Notebooks

This short video walks through Copilot Notebooks in action.

Why this matters for construction and training work

If you regularly work with construction standards, NCC compliance notes, contract comparisons, training materials, and checklists and evidence records, you could create a separate Copilot Notebook for each project.

For example, a Fire Compliance Notebook might hold NCC extracts, AS 1530.4 notes, inspection reports, OneNote pages and training slides.

Then you can ask "Create a learner checklist from these references" or "Summarise all requirements relating to penetrations." The responses stay grounded in those sources.

What happens when a source changes?

One big difference from uploading documents into a chat is that notebook references stay connected. If you update a referenced document in OneDrive or SharePoint, Copilot Notebook can use the updated version when generating answers, so responses stay current as the source content changes.

About the "only 20 resources will be used" message

In the consumer Microsoft 365 Personal experience, Copilot Notebooks currently limit how many references are actively used in a notebook. If you add more than the supported number, you will see a message that only a subset of resources will be considered for grounding. Microsoft has been expanding Notebook capabilities, but limits still exist depending on the plan and rollout stage.

In practice, if you add 40 PDFs, 15 Word documents and 10 OneNote sections, the notebook may only actively process the first supported number of references. That is why organising notebooks by topic usually works better than one large notebook.

My recommendation

Use a OneNote notebook for: long-term storage, meeting notes, standards references and research notes.

Use a Copilot Notebook for: a temporary project workspace with 10 to 20 highly relevant documents or notes, for AI analysis, summaries, comparisons and draft generation.

That gives much better grounded answers than throwing hundreds of mixed files into a single notebook.

Read Microsoft's guide to Copilot Notebooks in OneNote for the full details.

Watch: What's new in OneNote and Copilot Notebooks

Mike Tholfsen walks through six new OneNote features, plus how Copilot Notebooks are now available to everyone.

Video: "6 New Microsoft OneNote Features + Copilot Notebooks for ALL! (Fall 2026)" by Mike Tholfsen.