How to Connect Microsoft 365 to Claude—and Reconcile a Project Date Across Files, Email and Teams

Project dates drift in Microsoft 365. The plan in SharePoint says 14 March, a vendor email two weeks later floats the 21st, and a Teams thread ends with someone writing “ok, 21st works.” Whether the date actually changed depends on who said it and whether anyone with authority agreed.

Connected Claude can search those places for you. The useful habit is to make it show each source side by side—file, email, Teams message—and to keep “proposed” apart from “agreed.”

This walkthrough uses Anthropic’s Microsoft 365 connector for Claude. Product claims were checked against official Anthropic documentation on October 28, 2026. AI assisted the research and writing. The prompts and the fictional example are Connector Scout editorial recommendations, not results from hands-on testing.

The walkthrough ends with your review and anything you choose to send yourself. Prompts are not substitutes for checking your account, permissions and the sources themselves.

Before you connect: the right account and your admin

The connector is available on Free, Pro, Max, Team and Enterprise plans. It needs a work Microsoft 365 account tied to a Microsoft Entra tenant; personal accounts such as @outlook.com, @hotmail.com or @live.com cannot be used. If you are not sure which kind you have, ask IT. (Anthropic’s Microsoft 365 guide)

If you try before consent is granted, you will see an error saying an administrator must grant app permissions. Admins can follow Anthropic’s admin setup guide rather than steps reproduced here. (Anthropic’s Microsoft 365 guide; Anthropic’s admin setup guide)

Connect Microsoft 365 to Claude

1. Open Customize > Connectors in Claude.
2. Find Microsoft 365 and select Connect.
3. Sign in with your work Microsoft 365 account when prompted.
4. In a chat, use the + button > Connectors to turn Microsoft 365 on or off for that conversation.

Once connected, it also works in Claude for iOS and Android. Under Tool permissions you can switch off individual tools, for example keeping document search while turning off email. (Anthropic’s Microsoft 365 guide)

What Claude can reach—and what it cannot

Claude uses delegated permissions: it can reach only data you can already see in Microsoft 365, and only when you ask a question that needs it. It does not run background searches just because you connected. (Anthropic’s Microsoft 365 guide; Anthropic’s admin setup guide)

Naming a site in your prompt narrows the requested search; it does not revoke access to other authorized SharePoint content. Microsoft 365 permissions, administrator consent and tool controls determine actual access. (Anthropic’s Microsoft 365 guide)

Check one file and one email you already know

Open both yourself and compare. If a known file is missing, check you can open it in Microsoft 365, that it is in SharePoint or OneDrive rather than only on your computer, and try the exact file name or the site name. Recently uploaded files may take time to become searchable. (Anthropic’s Microsoft 365 guide)

Reconcile a date across the plan, email and Teams

Ask for each source separately, then ask which one is the latest agreed position. The structure is our recommendation, not a Microsoft or Anthropic feature.

A fictional example

This is an illustration, not a real result. Names, files and dates are invented.

The honest output here is “21 March proposed, informally accepted, not confirmed by the plan owner”—not “go-live is the 21st.”

Draft the follow-up in Claude

That last instruction is task direction, not a technical lock. Whether Claude can write at all depends on your admin: if write tools are enabled, Claude can draft and send email, manage calendar events, create and update files and send Teams messages, always within your existing permissions. Without them, the integration is read-only. (Anthropic’s Microsoft 365 guide)

A draft shown in the chat is different from a draft saved in your mailbox. If write tools are on, know the details: email writes cannot include attachments; emails Claude sends carry an agent-initiated header; creating or updating a calendar event makes Microsoft 365 notify attendees; and sending a Teams chat message or channel post always asks you to confirm first. Write tools also have per-user limits. (Anthropic’s Microsoft 365 guide; Anthropic’s admin setup guide)

Troubleshooting

Disconnecting and data handling

Disconnect from Customize > Connectors. That removes Claude’s access, and reconnecting does not need admin re-approval while consent is still active. Admins or users can also revoke access in Microsoft Entra ID. (Anthropic’s Microsoft 365 guide; Anthropic’s connector security guide)

Anthropic describes the connector as an Anthropic-hosted proxy that retrieves data on demand and does not cache file content. Tool results that become part of a saved chat are retained with that chat, so treat a chat containing work email like the email itself. (Anthropic’s connector security guide)

For the ChatGPT side of Microsoft 365, see our Outlook setup guide and SharePoint setup guide. For the record behind this connection, see Claude + SharePoint via Microsoft 365, and the connector permissions guide for evaluating access.