Microsoft Outlook MCP vs Proton Workflow Connector

In-depth architectural comparison of the Microsoft Outlook MCP and Proton Workflow Connector MCP servers. Compare execution transports, security boundaries, tool capabilities, quality scores, and ready-to-paste client installation snippets for Claude, Cursor, Windsurf, and VS Code.

Which MCP Server Should You Choose?

Choose Microsoft Outlook MCP when:

• You need dedicated capabilities in the Communication domain.
• You prefer local stdio subprocess transport architecture.
• Your security boundary fits: No auth required (Free / Open Source).

Explore Microsoft Outlook MCP Details

Choose Proton Workflow Connector when:

• You need dedicated capabilities in the Communication domain.
• You prefer local stdio subprocess transport architecture.
• Your security boundary fits: No auth required (Free / Open Source).

Explore Proton Workflow Connector Details

Feature & Specification Comparison

Specification	Microsoft Outlook MCP Communication	Proton Workflow Connector Communication
Summary	Microsoft Outlook (mail) MCP server — read, search, and send email through Microsoft Graph.	Unofficial self-hosted MCP connector for Proton Mail Bridge and SimpleLogin.
Category & Scope	Communication	Communication

Tools & Capabilities Breakdown

Ready-to-Paste Client Configurations

Paste either (or both) of these JSON server blocks into your client config file (e.g. claude_desktop_config.json or ~/.cursor/mcp.json).

{
  "mcpServers": {
    "microsoft-outlook-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "ms-calendar-mcp"
      ]
    }
  }
}

{
  "mcpServers": {
    "proton-workflow-connector": {
      "command": "npx",
      "args": [
        "-y",
        "proton-workflow-connector"
      ]
    }
  }
}

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