Microsoft 365 MCP Server

The Microsoft 365 MCP Server is a Model Context Protocol (MCP) implementation that bridges AI assistants with the full breadth of Microsoft 365 services via the Microsoft Graph API. By exposing a rich set of tools for email, calendar, file storage, collaboration, and user management, it enables AI agents to read, write, and orchestrate tasks across a user’s personal or organizational Microsoft 365 environment. The server is built on Node.js and leverages the Microsoft Authentication Library (MSAL) to secure access, making it a practical choice for developers who need trusted, granular control over Microsoft 365 resources in conversational AI workflows.

What Problem Does It Solve?

Many AI assistants struggle to interact safely and effectively with enterprise data. The Microsoft 365 MCP Server solves this by providing a single, well‑defined interface that abstracts the complexities of Graph API authentication, permission scopes, and service endpoints. Developers can issue high‑level tool calls—such as or —without writing custom Graph queries or managing OAuth flows. This reduces boilerplate, lowers the barrier to entry for integrating Microsoft 365 into AI assistants, and ensures that only the permissions explicitly granted by the user are exposed.

Core Value for Developers

For developers building AI assistants, the server offers a turnkey solution that:

• Standardizes Microsoft 365 access through MCP tool definitions, allowing consistent handling of requests across different services.
• Simplifies authentication with MSAL integration, supporting both personal and organizational accounts via a simple flag ().
• Provides read‑only mode for scenarios where the assistant must query data without making changes, enhancing security.
• Enables fine‑grained tool filtering, letting applications expose only the subset of operations that are relevant to a particular use case.

These features translate into faster prototyping, clearer permission management, and safer data handling—all critical for production AI assistants that interact with corporate Microsoft 365 tenants.

Key Features & Capabilities

• Personal Account Tools: Email (Outlook), Calendar, OneDrive files, Excel operations, OneNote, To‑Do tasks, Planner, Contacts, User profile, and search—all available by default.
• Organization Account Tools: Teams & chats, SharePoint sites and lists, shared mailboxes, user management—enabled with the flag.
• Granular Tool Access: Developers can whitelist or blacklist tools to tailor the assistant’s capabilities to specific workflows.
• Read‑Only Mode: A flag that restricts the server to non‑mutating operations, ideal for compliance‑heavy environments.
• Delegated Permissions Support: The server checks that the necessary Graph scopes (e.g., , ) are present before exposing shared mailbox tools.

Real‑World Use Cases

• Automated Email Management: An assistant can list, draft, and send emails on behalf of a user, or archive old messages automatically.
• Calendar Scheduling: The server can retrieve free/busy slots, create events, and update appointments, enabling conversational scheduling assistants.
• Document Collaboration: By listing OneDrive files or SharePoint items, an assistant can help users locate documents, upload new content, or generate Excel reports.
• Team Coordination: In organizational mode, the server can read chat history, post updates to Teams channels, or manage Planner tasks, facilitating project management bots.
• Compliance Auditing: Read‑only access to mailboxes and SharePoint sites allows assistants to surface audit logs or compliance reports without risking data alteration.

Integration into AI Workflows

An MCP‑aware assistant simply calls the server’s tools as part of its prompt chain. The server returns structured JSON responses, which the assistant can parse and use to generate natural language replies or trigger downstream actions. Because the server handles authentication, error handling, and rate limiting internally, developers can focus on higher‑level logic—such as intent detection or context management—rather than low‑level API plumbing. This tight integration makes it straightforward to embed Microsoft 365 capabilities into chatbots, virtual assistants, or workflow automation agents.

The Microsoft 365 MCP Server thus provides a powerful, secure, and developer‑friendly bridge between AI assistants and the full spectrum of Microsoft 365 services, enabling sophisticated conversational experiences that span email, calendar, files, and collaboration tools.