0n3
MCP servers · productivity

Microsoft 365 MCP server

Outlook mail, Teams messages, OneDrive files, calendar — via Microsoft Graph API. Hosted by 0n3: 20 endpoints your AI can call with your own Microsoft 365 account, from Claude, ChatGPT, Cursor, Claude Code, Codex or Gemini CLI. One sign-in, one key per AI, a receipt for every call.

Connect Microsoft 365Install into your AIWatch it work

20 endpoints6 categoriesauth: oauthhosted

What your AI can do with Microsoft 365

Mail · Send and manage Outlook email1
Send a mailPOST /me/sendMail
Events · Manage Outlook calendar events4
List eventsGET /me/events
Create an eventPOST /me/events
Update an eventPATCH /me/events/{eventId}
Delete an eventDELETE /me/events/{eventId}
Teams · Send Teams messages and list channels3
List teamsGET /me/joinedTeams
List channelsGET /teams/{teamId}/channels
Send a channel messagePOST /teams/{teamId}/channels/{channelId}/messages
Users · View organization users1
Get an userGET /me
Files · OneDrive and SharePoint files, including items shared by link from another user's drive0
OneDrive and SharePoint files, including items shared by link from another user's drive
More · Everything else this app exposes.11
List messagesGET /me/messages
Get a messageGET /me/messages/{messageId}
Delete a messageDELETE /me/messages/{messageId}
List drive itemsGET /me/drive/root/children
Get a drive itemGET /me/drive/items/{itemId}
Search driveGET /me/drive/root/search(q='{query}')
Resolve shareGET /shares/{encodedUrl}/driveItem
List shared with meGET /me/drive/sharedWithMe
Get an item contentGET /drives/{driveId}/items/{itemId}/content
Get a siteGET /sites/{hostname}:/sites/{sitePath}
List site itemsGET /sites/{siteId}/drive/root/children

Install in three steps

  1. Create a free account at 0n3.app and connect Microsoft 365: paste a key or sign in through a door. It lands in your vault, encrypted.
  2. Open 0n3.app/install, pick your AI. A key is made for that AI alone; copy the line it gives you.
  3. Ask your AI: whoami. It answers with your connected services. Then ask it to send a mail in Microsoft 365.
Install (user scope — every project)
claude mcp add --transport http --scope user 0n3 https://0n3.app/mcp --header "Authorization: Bearer <your 0n token>"

Connect Microsoft 365 to

Claude Code + Microsoft 365MCP server + skillClaude (desktop & claude.ai) + Microsoft 365connectorChatGPT + Microsoft 365connector · GPT actionCodex CLI + Microsoft 365MCP serverGemini CLI + Microsoft 365MCP serverCursor + Microsoft 365MCP serverVS Code (Copilot) + Microsoft 365MCP serverWindsurf + Microsoft 365MCP server

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Questions

What can an AI do with the Microsoft 365 MCP server?

20 things: mail, events, teams, users and more. Every call runs with your own Microsoft 365 connection and lands on a receipt.

Do I need to run anything on my computer?

No. 0n3 is hosted. Connect Microsoft 365 once, install 0n3 into your AI with one line, done.

Where does my Microsoft 365 key go?

Into your 0n3 vault, encrypted, one record per connection. The AI never sees it.