I am new to EWS and want to find a way to subscribe EWS notification.
I build an Outlook Add-in and use Microsoft Graph API to subscribe and handle notifications for Microsoft 365 if the customer's calendar has some changes from Microsoft Graph REST APIs for mail, calendars, and contacts. But Exchange server doesn't support graph API.
Also, i read some Microsoft Documents, like Notification subscriptions, mailbox events, and EWS in Exchange. It menstions Streaming notifications. The workflow is from Service callback tokens. It's not very good as Graph API which will send the notification automatically.
So, i want to ask whether Microsoft has similar solution for Add-in on Exchange or not.
