OutlookMCPServer

This project is an MCP server that gives Claude Desktop access to your Microsoft 365 mail (and soon, calendar) using the Microsoft Graph API.

✨ Features

• ✅ Mail access: Search, filter, and analyze your inbox from Claude or any MCP-compatible agent
• 🔜 Calendar support: Planned parity with mail features (querying, filtering, etc.)
• 🚧 OneDrive support: Possible future direction after mail and calendar are robust

🧱 Tech Stack

• msgraph (modern Microsoft Graph SDK)
• azure.identity with DeviceCodeCredential and TokenCachePersistenceOptions
• FastMCP — simple MCP-compliant server interface
• uv — fast Python dependency and env management

⚙️ Requirements

This is currently built to:

• Run locally on macOS
• Be used with Claude Desktop
• Authenticate using an Azure-registered application

⚠️ You must have admin access to an Azure tenant to configure this — the app registration requires consent for Microsoft Graph scopes (e.g. Mail.Read, Calendars.Read), which is not user-consentable by default in most orgs.

🚀 Getting Started

# Set up the environment
uv venv
uv pip install -r uv.lock

# Run locally using MCP Inspector
uv run mcp dev mcpserver/server.py (expect errors)

It is much easier to get things working in the Inspector before trying to debug in Claude.

🔐 Authentication Setup

Before running the application, you need to set up the following:

1. Create an auth_cache folder in the project root (see note):

mkdir -p auth_cache

2. Create a .env file in the project root

touch .env

3. Add the following to the .env:

echo "AZURE_CLIENT_ID=<your-id-from-Azure-portal-here>" > .env
echo "AZURE_TENANT_ID=<your-id-from-Azure-portal-here>" >> .env
echo "AZURE_GRAPH_SCOPES=User.Read Mail.Read Mail.Send Mail.ReadWrite" >> .env

NOTE: On first run, the application will authenticate using the DeviceCodeCredential flow and will create auth_record.json in the auth_cache folder automatically.

You must have admin access to an Azure tenant to register an application with these permissions.

Claude for Desktop Integration

To integrate with Claude Desktop, add this to your claude_desktop_config.json:

{
  "mcpServers": {
    "outlook": {
      "command": "uv",
      "args": [
        "--directory",
        "/absolute/path/to/OutlookMCPServer",
        "run",
        "mcpserver/main.py"
      ]
    }
  }
}

On Mac you can find the json file by looking in Settings/Developer/Edit Config

Restart Claude Desktop each time you make a change to config or to the server code.

📦 Folder Structure

.
├── README.md
├── main.py
├── settings.py
├── auth_cache/
│   └── auth_record.json
├── mcpserver/
│   ├── __init__.py
│   ├── graph.py
│   ├── mail_query.py
│   ├── message_info.py
│   ├── msgraph_client.py
│   └── server.py
├── tests/

📌 Roadmap

• Mail integration (DONE)
• Calendar integration (Started)
• Optional OneDrive integration
• Windows support
• GUI-free auth for end-users (if feasible)

📄 License

MIT

Copyright (c) 2024 Enthoosa AI

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.