Mail Index vs Outlook

In-depth architectural comparison of the Mail Index and Outlook 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?

M

Choose Mail Index 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 Mail Index Details

Choose Outlook 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 Outlook Details

Feature & Specification Comparison

Specification	M Mail Index Communication	Outlook Communication
Summary	Local-first, read-only MCP server for recall over your Gmail: search, contacts, threads, digests.	Outlook integration with OAuth, message search, batch operations, and calendar management
Category & Scope	Communication	Communication
Quality signal

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": {
    "mail-index-2": {
      "command": "npx",
      "args": [
        "-y",
        "-p"
      ]
    }
  }
}

{
  "mcpServers": {
    "outlook": {
      "command": "npx",
      "args": [
        "-y",
        "@mcp-z/cli"
      ]
    }
  }
}

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