Microsoft 365

Microsoft’s Graph API can be used to configure webhooks to receive change notifications for a range of different events. This could be new Outlook mail, new OneDrive files, new Teams chat messages and many more. This is a very powerful example of webhooks that could be used for ongoing data exfiltration for many different sensitive data types.

https://learn.microsoft.com/en-us/graph/api/resources/webhooks?view=graph-rest-1.0