With the Microsoft Graph Toolkit, you'll be able to connect your app to Microsoft 365 in a matter of minutes. Here is how you'd do it.
Microsoft 365, previously known as Office 365, is the productivity cloud from Microsoft used by 250 million people every day to collaborate and communicate. It's also a highly extensible development platform. All the information about its users as well as the content they create is stored in Microsoft 365 and, bearing the necessary permissions, available for you to interact with in your applications.
There are a number of different types of apps you can build for Microsoft 365. You can tap into one or more extensibility points or you can connect your existing web- or mobile app to Microsoft 365 and combine the information from the person's organization to your app, making your app more valuable.
You connect to Microsoft 365 using Microsoft Graph: a REST API that connects all services and data stored in Microsoft 365. And while you can communicate with it manually, building authentication and composing the right requests yourself, there is a better, much easier way to do it.