Simply Outlook MCP Server

A Model Context Protocol (MCP) server that enables AI assistants to interact with Microsoft Outlook calendars and emails through the Microsoft Graph API.

🚀 Features

📅 Calendar Management

• Get Calendar Events - Retrieve calendar events within specified date ranges
• Create Calendar Events - Create personal calendar events
• Create Events with Invites - Create calendar events and send invitations to attendees
• Update Calendar Events - Modify existing calendar events (subject, time, location, etc.)

📧 Email Operations

• Get Messages - Fetch recent Outlook messages with date filtering
• Get Message Content - Retrieve full content of specific messages by ID
• Search Messages - Search emails by keywords (sender, subject, content)
• Send Messages - Send new emails to specified recipients
• Reply to Messages - Reply to existing email messages
• Pagination Support - Handle large result sets with skip/limit parameters

⚙️ Configuration

• Selective Tool Control - Enable/disable individual tools via environment variables
• Environment Configuration - Flexible setup via environment variables
• TypeScript Support - Full type definitions included

📋 Prerequisites

• Node.js 20.19.0 or higher
• Azure AD Application:
  • Calendars.ReadWrite - Read and write calendar events
  • Mail.Read - Read email messages
  • Mail.Send - Send email messages
  • User.Read - Read user profile information

🛠️ Installation

Using npx (Recommended)

No installation required! Simply use npx to run the latest version:

Global Installation (Optional)

If you prefer to install globally:

npm install -g simply-outlook-mcp

From Source

For development or customization:

npm install
npm run build

🔧 Setup

[!NOTE] Security Best Practice: We recommend creating your own Azure AD application rather than using a client ID from an unknown 3rd party or untrusted publisher.

This MCP server runs locally. The code that uses the Microsoft Graph access tokens stays on your machine. The Azure AD / Entra "client ID" you supply only tells the directory which app registration to issue tokens for. If you reuse an arbitrary or third‑party client ID, you do not automatically leak your tokens to that party, but you are accepting several avoidable risks tied to the app registration that they control.

What a third party CAN change later if you use their client ID:

• Display name / branding you see during future consent prompts (could lower your guard)
• The set of requested delegated scopes (you may click "Accept" again out of habit)
• Publisher domain / verification state (influences user trust signals)
• Authentication settings (enabling flows they host to phish you for tokens)

1. Azure AD Application Registration

1. Go to the Azure Portal
2. Navigate to Microsoft Entra ID > Manage > App registrations
3. Click New registration
4. Configure:
   • Name: (Any name you like, will show up in the consent dialog)
   • Supported account types: Accounts in any organizational directory (Any Microsoft Entra ID tenant - Multitenant) and personal Microsoft accounts (e.g. Skype, Xbox)
   • Redirect URI: Leave blank
5. After creation, in the application resource view, note down client ID in the Overview page:
   • Application (client) ID
6. In the application resource view, go to Manage > Authentication page:
   • Toggle Enable the following mobile and desktop flows to Yes

[!NOTE] The scopes currently requested by this MCP are designed to work with personal Microsoft account (MSA).

2. Authentication Setup

npx simply-outlook-mcp --auth --client_id YOUR_CLIENT_ID

This will open a browser for device authentication. Sign in with your Microsoft account that has access to the Outlook data you want to manage.

🚀 Usage

Using with MCP Clients

The server implements the Model Context Protocol and can be used with any MCP-compatible AI assistant.

Example configuration for Claude Desktop:

{
  "mcpServers": {
    "simply-outlook-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "simply-outlook-mcp"
      ],
      "env": {
        "SIMPLY_OUTLOOK_MCP_CLIENT_ID": "your-client-id",
      }
    }
  }
}

VS Code

{
  "servers": {
    "simply-outlook-mcp": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "simply-outlook-mcp"
      ],
      "env": {
        "SIMPLY_OUTLOOK_MCP_CLIENT_ID": "your-client-id"
      }
    }
  }
}

Environment Variables

The following environment variables can be used to configure the MCP server:

Required Variables

Variable	Description	Example
SIMPLY_OUTLOOK_MCP_CLIENT_ID	Azure AD Application (client) ID	12345678-1234-1234-1234-123456789012

Optional Variables

Variable	Description	Default	Example
SIMPLY_OUTLOOK_MCP_TENANT_ID	Ignore this, for advance usage if you create single tenant or MSA only app	common
SIMPLY_OUTLOOK_MCP_DISABLED_TOOLS	Comma-separated list of tools to disable	None	get-calendar-events,send-outlook-message

Tool Names for Disabling

You can disable specific tools by adding their names to the SIMPLY_OUTLOOK_MCP_DISABLED_TOOLS environment variable:

Calendar Tools:

• get-calendar-events - Retrieve calendar events
• create-calendar-event - Create personal calendar events
• create-calendar-event-with-invite - Create events with invitations
• update-calendar-event - Modify existing calendar events

Email Tools:

• get-outlook-messages - Fetch recent messages
• get-outlook-message-content - Get full message content
• search-outlook-messages - Search emails by keywords
• send-outlook-message - Send new emails
• reply-outlook-message - Reply to existing emails

Example Configuration

{
  "mcpServers": {
    "outlook": {
      "command": "npx",
      "args": [
        "-y",
        "simply-outlook-mcp"
      ],
      "env": {
        "SIMPLY_OUTLOOK_MCP_CLIENT_ID": "12345678-1234-1234-1234-123456789012",
        "SIMPLY_OUTLOOK_MCP_DISABLED_TOOLS": "create-calendar-event-with-invite,update-calendar-event,send-outlook-message,reply-outlook-message"
      }
    }
  }
}

[!TIP] Disabling Tools: You can disable tools you don't need for security or functionality reasons. For example, disable email sending tools (send-outlook-message,reply-outlook-message) if you only want read-only email access.

License

MIT License - see LICENSE file for details.

Support

• GitHub Issues: Report bugs or request features
• Repository: https://github.com/hmmroger/simply-outlook-mcp