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

1. Create an Azure App Registration at Azure Portal
2. Set redirect URIs:
   • http://localhost:3333/auth/callback
   • For remote: https://your-domain.com/auth/callback
3. 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

1. Connect your GitHub repository to Railway
2. Set environment variables in Railway dashboard
3. 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

1. Clone repository
2. Install dependencies: npm ci --production
3. Configure environment variables
4. Start server: npm run start-remote
5. 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

1. Fork the repository
2. Create feature branch
3. Make changes with tests
4. Update documentation
5. 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