microsoft-365-integration

name	microsoft-365-integration
description	Integrate with Microsoft 365 using the Microsoft Graph API. Covers Outlook mail, calendar, Teams, OneDrive, SharePoint, and Excel automation for building AI-powered productivity workflows.
license	Apache 2.0
tags	["microsoft-365","graph-api","outlook","teams","sharepoint","onedrive","office","enterprise"]
difficulty	intermediate
time_to_master	8-14 weeks
version	1.0.0

Microsoft 365 Integration

Overview

Microsoft 365 powers 400M+ paid seats globally. The Microsoft Graph API provides unified access to Outlook mail, Calendar, Teams, OneDrive, SharePoint, Excel, and more — all through a single REST endpoint. AI agents with Graph API access can manage email, schedule meetings, search documents, post to Teams channels, and automate office workflows.

When to Use This Skill

• Building MCP servers that manage Outlook email and calendar
• Automating Teams messages, channel management, and meeting scheduling
• Implementing document management with OneDrive and SharePoint
• Creating AI-powered email triage and response workflows
• Building enterprise search across Microsoft 365 content

Core Concepts

Microsoft Graph API Structure

https://graph.microsoft.com/v1.0/
  ├── /me/                    (Current user)
  │   ├── /messages           (Outlook mail)
  │   ├── /calendar/events    (Calendar)
  │   ├── /drive/root         (OneDrive files)
  │   ├── /joinedTeams        (Teams)
  │   └── /contacts           (People)
  ├── /users/{id}/            (Specific user)
  ├── /groups/{id}/           (Groups/Teams)
  ├── /sites/{id}/            (SharePoint)
  └── /teams/{id}/channels    (Teams channels)

Authentication: Azure AD OAuth 2.0

Flow	Use Case	Scopes
Authorization Code	User-interactive apps	Delegated permissions
Client Credentials	Daemon/service apps	Application permissions
On-Behalf-Of	API-to-API delegation	Delegated via middleware

Common Permissions

Operation	Permission (Delegated)	Permission (Application)
Read mail	Mail.Read	Mail.Read
Send mail	Mail.Send	Mail.Send
Read calendar	Calendars.Read	Calendars.Read
Create events	Calendars.ReadWrite	Calendars.ReadWrite
Read files	Files.Read	Files.Read.All
Post to Teams	ChannelMessage.Send	ChannelMessage.Send

Implementation Guide

Email Management

import { Client } from "@microsoft/microsoft-graph-client";

const graphClient = Client.init({
  authProvider: (done) => done(null, accessToken),
});

// Get recent emails
const messages = await graphClient
  .api("/me/messages")
  .select("subject,from,receivedDateTime,bodyPreview,isRead")
  .filter("isRead eq false")
  .orderby("receivedDateTime desc")
  .top(20)
  .get();

// Send an email
await graphClient
  .api("/me/sendMail")
  .post({
    message: {
      subject: "Q2 Pipeline Review",
      body: {
        contentType: "HTML",
        content: "<p>Please review the attached pipeline summary.</p>",
      },
      toRecipients: [
        { emailAddress: { address: "[e-mail]" } },
      ],
    },
  });

// Search emails
const searchResults = await graphClient
  .api("/me/messages")
  .()
  .()
  .()
  .();

Calendar Operations

// Get upcoming meetings
const events = await graphClient
  .api("/me/calendarView")
  .query({
    startDateTime: new Date().toISOString(),
    endDateTime: new Date(Date.now() + 7 * 86400000).toISOString(),
  })
  .select("subject,start,end,location,attendees,isOnlineMeeting")
  .orderby("start/dateTime")
  .get();

// Schedule a meeting
const newEvent = await graphClient
  .api("/me/events")
  .post({
    subject: "Design Review",
    start: { dateTime: "2026-04-01T14:00:00", timeZone: "America/New_York" },
    end: { dateTime: "2026-04-01T15:00:00", timeZone: "America/New_York" },
    attendees: [
      {
        emailAddress: { address: "[e-mail]", name: "Jane Doe" },
        type: "required",
      },
    ],
    isOnlineMeeting: ,
    : ,
  });


 availability =  graphClient
  .()
  .({
    : [
      { : { :  }, :  },
    ],
    : {
      : [{
        : { : , :  },
        : { : , :  },
      }],
    },
    : ,
  });

Teams Integration

// Post a message to a Teams channel
await graphClient
  .api(`/teams/${teamId}/channels/${channelId}/messages`)
  .post({
    body: {
      contentType: "html",
      content: "<h3>Daily Pipeline Update</h3><p>3 deals moved to negotiation stage today.</p>",
    },
  });

// Get chat messages
const messages = await graphClient
  .api(`/me/chats/${chatId}/messages`)
  .top(50)
  .get();

Microsoft 365 MCP Server

server.tool(
  "search_emails",
  "Search Outlook emails by subject, sender, or content",
  {
    query: z.string().describe("Search terms"),
    folder: z.enum(["inbox", "sent", "drafts", "all"]).default("inbox"),
    unreadOnly: z.boolean().default(false),
    days: z.number().default(7),
  },
  async ({ query, folder, unreadOnly, days }) => {
    let filter = `receivedDateTime ge ${daysAgo(days)}`;
    if (unreadOnly) filter += " and isRead eq false";

    const messages = await graphClient
      .api("/me/messages")
      .search(`"${query}"`)
      .filter(filter)
      .select("subject,from,receivedDateTime,bodyPreview,isRead")
      .top(15)
      .get();

    return {
      content: [{
        type: "text",
        text: messages.value.(
           +
          
        ).(),
      }],
    };
  }
);

server.(
  ,
  ,
  {
    : z.().(),
  },
   ({ days }) => {
     events =  graphClient
      .()
      .({
        :  ().(),
        :  (.() + days * ).(),
      })
      .()
      .()
      .();

     {
      : [{
        : ,
        : events..(
           +
           +
           +
          (e. ?  : )
        ).(),
      }],
    };
  }
);

Best Practices

1. Use delegated permissions when acting on behalf of a user; application permissions for daemons
2. Request minimal scopes — only ask for permissions the app actually needs
3. Use $select to limit fields — reduces payload size and improves performance
4. Implement delta queries for incremental sync instead of full re-fetch
5. Handle throttling — respect Retry-After headers on 429 responses
6. Use batch requests — combine up to 20 requests in a single batch call

Resources

• Microsoft Graph Documentation
• Graph Explorer
• Microsoft Graph JS SDK

Changelog

Version	Date	Changes
1.0.0	2026-03-31	Initial documentation