Episode
Microsoft Graph Webhooks - Simply Explained
- Published
- Jul 24, 2026
- Duration seconds
- 1140
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Summary
Welcome to another episode of Knowledge Nuggets with Mirko Peters. Today we're exploring Microsoft Graph Webhooks, one of the core building blocks for creating modern, event-driven Microsoft 365 applications. Almost every developer building with Microsoft 365 eventually faces the same challenge. How do you know when something changes? Whether you're waiting for a new user to be created in Microsoft Entra ID, a document to be uploaded to SharePoint, or an email to arrive in Outlook, the traditional solution has always been polling—repeatedly asking Microsoft Graph if anything has changed. The problem is that most of those requests return nothing, wasting API calls, increasing latency, and eventually leading to Microsoft Graph throttling. Microsoft Graph Webhooks solve this by completely changing the communication model. Instead of your application constantly asking Microsoft Graph for updates, Microsoft Graph automatically sends your application an HTTP request whenever something important happens. In this episode, we'll explore how Graph Webhooks work, why they're more efficient than polling, how subscriptions and validation fit together, and why combining webhooks with Delta Query creates one of the most reliable integration patterns available for Microsoft 365. WHY POLLING DOESN'T SCALE Before understanding webhooks, it's important to understand the limitations of polling. Imagine checking your mailbox every five minutes throughout the day. Most of the time, there's nothing inside. Yet you continue making the same trip over and over again. Traditional applications behave exactly the same way. They repeatedly send requests asking Microsoft Graph whether anything has changed. Most requests receive exactly the same response: nothing has happened. Although each request s…