Calendar API for Microsoft Outlook Calendar integration

The Nylas Calendar API provides a simple, secure, and full-featured integration for Microsoft Outlook calendars.

Calendar Integration
Background Image
import Nylas from 'nylas';
    clientId: CLIENT_ID,
    clientSecret: CLIENT_SECRET,
var nylas =  
    .then(count => {
            `You have ${count} events.`
public class Calendar { 
  public static void main (String[] args) throws Exception {
    NylasAccount account = new NylasClient().account(ACCESS_TOKEN);
    List events =
      new EventQuery().title("Birthday Party!")); Event event ) -> {
      System.out.println( event.getLocation() ); 
from nylas import APIClient
nylas = APIClient(
events =
for event in events:
require 'nylas'
nylas =
    app_id: CLIENT_ID,
    app_secret: CLIENT_SECRET,
    access_token: ACCESS_TOKEN
events =
events.each do |events|
    puts events.title

Simplify your Outlook Calendar integration with Nylas

Eliminate the complexities of integrating Microsoft Outlook calendars directly into your app. The Nylas Calendar API removes the headaches with CalDav, CardDav, and .ics files — just plug in and go.

Get real-time, secure, and bi-directional integration with Outlook Calendar and all other major calendar providers without the hassle of managing multiple integrations. With Nylas, ongoing maintenance becomes worry-free.

Bypass the complexity of Outlook Calendar protocols

With Nylas, you can build bi-directional sync between your app and Outlook calendars with just a few lines of code.

Application integration

Bi-directional sync & full CRUD

Sync data bi-directionally between Outlook calendars and your app, and give users full CRUD (create, read, update, and delete) access natively within your application.


Unlock every calendar feature

Power team-wide availability insights, enable smooth timezone updates, access round-robin booking, virtual calendars for non-human resources, and more.

Real-time Outlook Calendar sync

Sync historical and live calendar data bi-directionally in real-time with 100% accuracy.

Build for free

Unlock your potential with Nylas and start building for free today. Experience the power of our robust APIs to streamline your development process and maintenance with integrations across providers.

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Let our experts help you build a best-in-class Outlook Calendar integration

Contact us today for more information, including live demos, implementation options, and pricing details.

Our experts will help you understand:

  • How to integrate with Outlook Calendar
  • What you need to know about the Microsoft authentication process
  • How Nylas helps mitigate the complexity of building and maintaining your calendar integrations

Embed scheduling instantly from any calendar
Cut the cost of maintaining an Outlook Calendar integration

Outlook Calendar integration is time-consuming and expensive, involving complex requirements like authentication protocols, data synchronization, and ongoing maintenance. Additional considerations can add complexity and cost to the integration process:

  • Ensuring your app is compatible with different versions and updates of Outlook calendars
  • Handling data privacy regulations, such as GDPR, and implementing necessary compliance measures
  • Providing efficient user support and troubleshooting for any issues related to Outlook Calendar integration 
  • Optimizing the performance of your app when interacting with Outlook calendars may involve fine-tuning queries, reducing latency, and optimizing data retrieval strategies
  • Implementing robust monitoring and analytics capabilities to track the usage, performance, and user behavior related to Outlook Calendar integration 

With Nylas, none of these costs apply — we manage servers, specialization, security certifications, and provide world-class support SLAs.

Calculate your savings with the Nylas APIs
Nylas ensures secure integration with Outlook Calendars for enhanced data protection

Nylas provides a secure solution for integrating with Outlook calendars, offering robust security measures to protect sensitive data.

  • Secure authentication mechanisms to ensure only authorized users can access and modify calendar data
  • Industry-standard encryption protocols to protect data both during transit and storage, ensuring enhanced data security
  • Designed to meet regulatory requirements such as GDPR, providing a compliant framework for integrating with Outlook calendars
  • Nylas proactively monitors and addresses security vulnerabilities, offering regular updates and patches to maintain a secure integration
  • Fine-grained access controls, allowing you to define specific permissions and scopes for accessing calendar data, enhancing data protection and privac
Download the Security Whitepaper
Frequently Asked Questions

What is Outlook Calendar API Integration?

Outlook Calendar API integration involves connecting the functionalities of Outlook Calendar 

with another app or service using the Outlook Calendar API. The Outlook Calendar API allows developers to access and interact with calendar data, creating, updating, and retrieving events, tasks, and other calendar-related information. 

By integrating with the Outlook Calendar API, developers can enable their apps to sync and interact with Outlook Calendar, providing users with seamless access to their events, appointments, and tasks from within the integrated platform. This integration allows users to leverage the features and capabilities of Outlook Calendar while using their preferred app or service.

How do I get started integrating with the Outlook Calendar API?

To start integrating with the Outlook Calendar API, you must first authenticate your application with Outlook to obtain the required credentials. Microsoft has API documentation you can follow, which outlines the endpoints, request formats, and response structures. Then, utilize the documentation and relevant SDKs to build your integration and access the desired calendar functionalities.

How do I integrate Outlook Calendar API with my app?

To integrate the Outlook Calendar API with your app, follow this step-by-step guide, covering all the necessary aspects to sync Google and Outlook calendars, allowing you to combine calendars from different providers. Get instructions on setting up a Nylas application, utilizing Vercel for frontend and backend development, configuring Google and Azure apps, testing app integrations through the Nylas Dashboard, implementing a hosted authentication flow, handling the Nylas callback in the backend, syncing calendar events, and displaying the synchronized calendars on the frontend.

Is there a cost associated with using Outlook Calendar integration?

The cost of using Outlook Calendar integration depends on your subscription plan. If you’re using Microsoft 365, calendar integration is typically included as part of the subscription. However, if you’re using a standalone Outlook account, there may be limitations or additional costs associated with API access. Check Microsoft’s pricing documentation or consult their sales team for accurate and up-to-date information.

Adding calendar functionality to your app includes additional costs beyond initial setup and configuration. You also need to consider ongoing maintenance and support, necessary updates or upgrades, security, infrastructure, and fees charged by the providers. See here for a detailed breakdown of integration steps, time savings per provider, and how Nylas can save you money and help you integrate faster.

What programming languages can I use to integrate the Outlook Calendar API?

Several programming language options exist to integrate the Outlook Calendar API with your app. JavaScript/Node.js, Python, C#, Java, and Ruby are popular choices. These languages allow you to make HTTP requests and interact with the Outlook Calendar API. You can also consider using Nylas, which provides an API abstraction layer for integrating with various calendar services, including Outlook Calendar. Nylas simplifies the integration process by offering a unified interface that you can use with different programming languages.

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