Outlook MCP Server

A Model Context Protocol (MCP) server that provides Claude with access to Microsoft Outlook through the Microsoft Graph API. Features multi-account support, remote deployment capabilities, and comprehensive email, calendar, and folder management.

Quick Start

1. Install Dependencies

npm install

2. Configure Azure App Registration

Create an Azure App Registration at Azure Portal
Set redirect URIs:
- http://localhost:3333/auth/callback
- For remote: https://your-domain.com/auth/callback
Grant permissions: Mail.ReadWrite, Calendars.ReadWrite, offline_access

3. Environment Setup

Copy .env.example to .env and configure:

# Azure App Registration
MS_CLIENT_ID=your-azure-client-id
MS_CLIENT_SECRET=your-azure-client-secret
OUTLOOK_CLIENT_ID=your-azure-client-id
OUTLOOK_CLIENT_SECRET=your-azure-client-secret

# Server Configuration
USE_TEST_MODE=false
MCP_PORT=3001

4. Claude Desktop Configuration

Add to your Claude Desktop config:

{
  "mcpServers": {
    "outlook-mcp": {
      "command": "node",
      "args": ["/path/to/outlook-mcp/index.js"],
      "env": {
        "USE_TEST_MODE": "false"
      }
    }
  }
}

Usage Modes

Local Mode (Default)

npm start

Runs via stdio for Claude Desktop integration.

Remote Mode

npm run start-remote

Runs HTTP server on port 3001 with MCP endpoint at /mcp.

Test Mode

npm run test-mode

Runs with mock data for development.

Features

Multi-Account Support

Manage multiple Outlook accounts simultaneously
Separate authentication and token storage per account
Account-specific operations and data isolation

Email Management

List, search, and read emails
Send emails and create drafts
Reply to messages
Manage folders and move emails
Handle attachments

Calendar Management

List calendar events
Create, update, and delete events
Accept/decline meeting invitations
Manage calendar permissions

Folder & Rules Management

Create and manage email folders
Set up email rules and filters
Organize mailbox structure

MCP Tools

Authentication

authenticate - Add new Outlook account
check-auth-status - View account authentication status
list-accounts - List all configured accounts
remove-account - Remove an account

Email Tools

list-emails - List emails with filtering options
read-email - Read specific email content
send-email - Send new email
create-draft - Create email draft
reply-to-email - Reply to existing email
search-emails - Search emails by criteria
mark-as-read - Mark emails as read/unread

Calendar Tools

list-calendar-events - List calendar events
create-calendar-event - Create new event
delete-calendar-event - Delete event
accept-calendar-event - Accept meeting invitation
decline-calendar-event - Decline meeting invitation

Folder Tools

list-folders - List email folders
create-folder - Create new folder
move-email - Move email to folder

Deployment

Railway Deployment

Connect your GitHub repository to Railway
Set environment variables in Railway dashboard
Deploy automatically on git push

Environment variables for Railway:

MS_CLIENT_ID=your-azure-client-id
MS_CLIENT_SECRET=your-azure-client-secret
OUTLOOK_CLIENT_ID=your-azure-client-id
OUTLOOK_CLIENT_SECRET=your-azure-client-secret
NODE_ENV=production
USE_TEST_MODE=false

Docker Deployment

FROM node:18-alpine
WORKDIR /app
COPY package*.json ./
RUN npm ci --production
COPY . .
EXPOSE 3001
CMD ["npm", "run", "start-remote"]

Manual Server Setup

Clone repository
Install dependencies: npm ci --production
Configure environment variables
Start server: npm run start-remote
Configure reverse proxy (nginx/Apache) if needed

Architecture

outlook-mcp/
├── auth/                  # Authentication & account management
│   ├── index.js          # Main auth module exports
│   ├── server.js         # OAuth server (moved from root)
│   ├── account-manager.js # Multi-account management
│   ├── token-manager.js  # Token storage & refresh
│   └── tools.js          # Auth MCP tools
├── calendar/             # Calendar operations
├── email/               # Email operations
├── folder/              # Folder management
├── rules/               # Email rules
├── utils/               # Shared utilities
│   ├── graph-api.js     # Graph API helpers
│   ├── odata-helpers.js # OData query builders
│   ├── permissions.js   # Permission checking
│   └── mock-data.js     # Test data
├── Scripts/             # Deployment & management scripts
├── config.js            # Configuration management
├── index.js             # Main server entry point
└── package.json         # Dependencies & scripts

Security

Best Practices

Environment variables for all secrets
Separate token storage per account
Automatic token refresh
HTTPS enforcement in production
CORS configuration for remote access

Token Management

Tokens stored in ~/.outlook-mcp-accounts/
Automatic refresh before expiration
Secure token storage with unique account IDs
Cleanup on account removal

Troubleshooting

Common Issues

"No accounts configured"

Solution: Use authenticate tool to add an account

"Authentication required for account X"

Solution: Re-authenticate the specific account

CORS errors in browser

Solution: Check CORS configuration for your domain

Port already in use

Solution: Change MCP_PORT environment variable

Health Checking

Local: Use check-auth-status tool
Remote: Visit http://localhost:3001/health

Logs

Server logs to stderr
Authentication events logged with account IDs
Error details for debugging

Development

Prerequisites

Node.js 14+
Azure App Registration
Microsoft Graph API permissions

Scripts

npm start - Local stdio mode
npm run start-remote - Remote HTTP mode
npm run auth-server - Start OAuth server only
npm run test-mode - Run with mock data
npm run inspect - Run with MCP inspector

Contributing

Fork the repository
Create feature branch
Make changes with tests
Update documentation
Submit pull request

License

MIT License - see LICENSE file for details.

Support

GitHub Issues: Report bugs
Documentation: This README
MCP Protocol: modelcontextprotocol.io
Microsoft Graph: docs.microsoft.com/graph

This server cannot be installed

security - not tested

license - not found

quality - not tested

How are these scores calculated?

Provides Claude with access to Microsoft Outlook through the Microsoft Graph API, enabling management of emails, calendar events, and folders across multiple accounts.

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