To use Microsoft To Do integration in n8n, start by adding the Microsoft To Do node to your workflow. You'll need to authenticate your Microsoft To Do account using supported authentication methods. Once connected, you can choose from the list of supported actions or make custom API calls via the HTTP Request node, for example: after setting up the Microsoft To Do node, you can create tasks, update them, or even retrieve your completed tasks using the respective actions. Make sure you configure the parameters correctly for each action based on your workflow needs. Once everything is set up, you can execute your workflow, and it will communicate with Microsoft To Do as intended.