# Outlook MCP Server

An MCP server for Outlook.com and Microsoft 365 accounts. Supports listing, reading, deleting, marking, and moving emails, plus attachment management. Connects through Azure App Registration with OAuth2.

npm

❯cat outlook-mcp-server/ARCHITECTURE.md

## How It Works

The MCP server authenticates to Microsoft Graph using OAuth2 with an Azure App Registration. On first run it opens a browser for interactive consent; subsequent runs use a cached refresh token. All email operations go through the /me/messages Graph endpoint with full MIME body support.

MCP Client (Claude) ──stdio──▶ Outlook MCP Server
                                       └── OAuth2 token cache
                                       └── MS Graph API v1.0
                                              └── /me/messages
                                              └── /me/mailFolders
                                              └── /me/messages/{id}/attachments

❯outlook-mcp-server --demo

## Screenshots

outlook-mcp — list emails

❯  list_emails  folder=Inbox  limit=5

   ID          FROM                    SUBJECT
   ────────────────────────────────────────────────
   msg_a1      [email protected]         Q3 mockups ready
   msg_a2      [email protected]           Build #2841 passed
   msg_a3      [email protected]        ENG-1842 assigned
   msg_a4      [email protected]         Invoice Jun 2026
   msg_a5      [email protected]         Sprint review Fri

outlook-mcp — read + move

❯  get_email  id=msg_a1

   From:    [email protected]
   Subject: Q3 mockups ready
   Body:    Hi! Figma link attached. Please review by Fri.
   Attachments: mockups-v2.fig (2.3 MB)

❯  move_email  id=msg_a1  folder=Design/Review
   ✓  Moved to Design/Review

❯  mark_email  id=msg_a1  read=true
   ✓  Marked as read

❯grep -n "## Features" outlook-mcp-server/README.md

## Features

+List and read emails with full body
+Delete and mark read/unread
+Move emails between folders
+Attachment listing and download
+OAuth2 via Azure App Registration

❯outlook-mcp-server --compare

## vs. The Field

Feature	Outlook MCP Server	Direct Outlook API	Zapier Outlook
MCP protocol native	✓	✗	✗
OAuth2 / Azure AAD	✓	✓	✓
Attachment support	✓	✓	partial
Claude Code integration	✓	✗	✗
Free / open source	✓	free	paid

❯cd outlook-mcp-server && cat INSTALL.md

## Installation

View on npm

Register an Azure App

portal.azure.com → Azure Active Directory → App registrations → New registration.

⚠ Add delegated permissions: Mail.Read, Mail.ReadWrite, Mail.Send (optional).

Install

No build step required.

npx -y @web4w3/outlook-mcp-server

Set Azure credentials

export AZURE_CLIENT_ID=your-client-id
export AZURE_TENANT_ID=your-tenant-id
export AZURE_CLIENT_SECRET=your-secret

Add to Claude config

First run opens a browser for OAuth consent. Token is cached locally.

{
  "mcpServers": {
    "outlook": {
      "command": "npx",
      "args": ["-y", "@web4w3/outlook-mcp-server"],
      "env": {
        "AZURE_CLIENT_ID": "your-client-id",
        "AZURE_TENANT_ID": "your-tenant-id",
        "AZURE_CLIENT_SECRET": "your-secret"
      }
    }
  }
}

❯cat outlook-mcp-server/package.json | jq '.dependencies | keys'

## Tech Stack

Node.jsTypeScriptMS Graph APIOAuth2MCP SDK

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