On October 9, Microsoft published its "What's New in Notebooks | October 2026" post, and Neowin framed it immediately as the company taking on Google's NotebookLM. Microsoft's own wording describes Copilot Notebooks as an "AI-powered workspace for a project or topic" that pulls Microsoft 365 context into one place: collect references, ask questions grounded in the project, surface insights, then turn them into shareable outputs. The shift in emphasis is from answering questions about stored material to completing work from it.
The headline additions are task delegation and scheduled automation. Users hand a specific task to Copilot from inside a notebook, and can set recurring jobs such as a daily morning briefing or a weekly status deck instead of re-prompting. Word, Excel and PowerPoint files can now be opened and edited inline, with colleagues, without leaving the notebook. Output tools grow too: live-editable interactive reports with charts and data filters, PDF generation from chat, and HTML reports that open in any browser. Users can also pick which model answers, or ask for deeper reasoning, and Copilot is said to suggest documents and presentations based on what already sits in the notebook.
Windows Forum's read of Microsoft's October 9 status puts the features in three tiers. Generally available now: expanded reference types such as Markdown, TXT and RTF, plus suggested artifacts. Limited to the Frontier preview program: the refreshed navigation in the Copilot app and OneNote, task delegation, model choice, in-notebook Office editing, interactive reports and PDF creation. Promised for "the next few weeks": creating a notebook from a prompt, recurring task automations and audio overview updates. Gadget Hacks stresses the gap — only the Audio Overview item carries a dated entry in Microsoft's own tracking, roadmap ID 570966, marked in development with both preview and general availability targeted at October 2026 on desktop and web. Its advice: don't build a workflow around capabilities that are still described as rolling out in phases.
Copilot Notebooks has no price of its own. Business access rides on a Microsoft 365 Copilot license at $30 per user per month billed annually on top of a qualifying plan, or on Copilot Chat, included at no extra cost with eligible business subscriptions. At home it comes with Microsoft 365 Personal at $9.99 a month, Family at $12.99 or Premium at $19.99. The license also sets how far a notebook can see: paying seats can hold more than 300 references with the first 300 used, while Copilot Chat users are capped at 50 with standard sources only. Notebooks began extending to Copilot Chat users on June 11, 2026, and since late September can take Power BI reports as references.
Google renamed NotebookLM to Gemini Notebook on July 16, 2026 and on September 15 announced a study-focused round: real-time voice conversations in nearly 100 languages, a mobile recorder, quizzes and flashcards, interactive learning overviews and short video overviews, rolling out first to Google AI Ultra subscribers aged 18 and over. The entry price is the differentiator — Gemini Notebook is free, with higher limits attached to Google AI Plus at $4.99 a month and Google AI Pro at $19.99.
The stakes land mainly on people whose files already live in Microsoft 365. Microsoft's two entry points — a lightweight view in the Copilot app and a full workspace in OneNote, kept in sync — only matter if the Frontier features reach general availability. Three questions decide whether this reads as a genuine NotebookLM challenger: when task delegation and in-notebook Office editing leave preview, whether the "coming weeks" automations arrive on schedule, and whether a paid, Microsoft-anchored notebook beats a free Google one on the work that actually pays.