How to Connect Multiple OneNote Accounts to Claude
Claude can work across OneNote notebooks in several Microsoft accounts, but only through a connector that actually reads OneNote. Claude’s own Microsoft 365 connector doesn’t: Anthropic’s help center says “OneNote isn’t supported,” and notebooks that show up in search fail to open. It also holds “one Microsoft account at a time.” Connect each account’s OneNote to Carly instead, add Carly to Claude once, and Claude can read, create and organize pages in every notebook, work and personal, in the same chat.
1. Add your Microsoft accounts to Carly
- Sign in at carlyassistant.com.
- Open carlyassistant.com/integrations.
- Find OneNote, click Connect, and sign in with your first Microsoft account.
- Click Connect again and choose Use another account for the next one.
A work account may ask for your Microsoft 365 admin’s approval before it connects.
Add your meeting notetaker, Outlook and your task app while you are there. That is what lets notes file themselves later.
2. Add Carly to Claude
- Click Get the Carly connector, then Connect, and sign in with your Carly account.
- In the conversation, open + → Connectors and enable Carly.
What one chat can do afterwards
- List every notebook, section and section group across your accounts.
- Read pages and answer questions from them.
- Create pages, sections and notebooks where you say.
- Copy a page or section from one notebook to another.
- Reach team notebooks in Microsoft 365 groups and SharePoint sites you belong to.
- Turn the action items on a page into tasks or an email.
One question can search work and personal notes together:
Look through my Clients notebook at work and my Side Projects notebook at home for anything about the Acme pricing discussion, and summarize what we agreed.
Why OneNote is the gap in Claude’s connector
Anthropic’s Microsoft 365 connector reads Word, Excel, PowerPoint, PDFs and text files. OneNote is the documented exception: notebooks appear in search results, but reading one returns a “mime type ‘application/msonenote’ is not allowed” error. The usual workaround is exporting pages to Word or PDF first, which defeats the point of a notebook you add to every day.
On top of that, the connector holds one Microsoft account at a time, work accounts are read-only unless an administrator enables write tools, and each tenant needs a one-time consent from a Global Administrator.
Give Claude's scheduled tasks a time and they will run. Give them something that just happened and they will not. ChatGPT goes further, but only on web and mobile, and only for apps whose plugin supports events: OpenAI documents Gmail, Slack and GitHub and has not named the rest. A lead moving stage, a form landing, an invoice clearing: neither one has a published way to start on it. Carly starts on all of it.
Notes that file themselves: Carly workflows
OneNote is most useful when you never have to file into it. Carly runs workflows in the cloud on a schedule or when something happens:
- Every meeting, a page. After each Zoom or Teams call, Carly takes the Fathom, Fireflies or tl;dv summary and creates a page in the client’s section with the decisions and next steps.
- Email to notebook. Forward any email with “save to OneNote”, or let a workflow catch messages from key clients, and Carly saves them to the matching section.
- A page for every morning. At 7am Carly creates today’s page with your calendar, the emails waiting on you and the tasks due.
- Action items out. When a page gets new action items, Carly creates them in Todoist, Asana or Microsoft To Do with owners and dates.
- Weekly digest. On Friday, Carly reads the week’s pages across your notebooks and emails you one summary.
Claude’s connector versus Carly
| Need | Claude’s Microsoft 365 connector | Carly connector |
|---|---|---|
| Read OneNote pages | Not supported | Yes |
| Create pages and sections | No | Yes |
| Keep several Microsoft accounts connected | One at a time | Yes |
| Reach team notebooks | No | Yes |
| File meeting notes after every call | No | Yes |
Free Zapier-style workflows; AI agents from $35/month. Start with Carly’s OneNote integration.
Quick fixes
| Problem | Fix |
|---|---|
| Claude says it can’t open a notebook | That’s Claude’s own connector. Use Carly for OneNote |
| The same account connected twice | Remove the duplicate and reconnect with Use another account |
| A team notebook doesn’t appear | Make sure the connected account is a member of that group or site |
| Carly is added but unused | Enable Carly under + → Connectors for the conversation |
Frequently asked questions
Can Claude read OneNote?
Not through Claude’s own Microsoft 365 connector, which Anthropic says doesn’t support OneNote. Through Carly, Claude can read, create and organize OneNote pages, sections and notebooks.
Can Claude use OneNote on a work and a personal account?
Yes, through Carly. Connect both accounts’ OneNote to Carly and add Carly to Claude, and both sets of notebooks are available in one chat.
Can Claude write meeting notes into OneNote automatically?
Claude itself only acts while a chat is open. A Carly workflow files every meeting summary into OneNote after the call, with no chat open.
Does this work in Claude Cowork?
Yes. Add the Carly connector to Cowork and the same notebooks are available.
Related: Claude and OneNote · OneNote alternatives · Multiple Word accounts in Claude · Multiple OneDrive accounts in Claude · Multiple Teams accounts in Claude · Carly’s OneNote integration
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