Calendar delegation is a feature of Exchange, the Graph API and Outlook API do not allow the user to access the delegated calendar. Currently, the alternative workaround could be use the EWS. And here is an sample for your reference: static void DelegateAccessSearchWithFilter(ExchangeService service, SearchFilter filter) { // Limit the result set to 10 items. … Read more
UPDATE: The InternetMessageHeaders property was added to the beta endpoint of the Outlook API, so you can get this without using the extended property stuff. You do have to request the property explicitly via $select though. Something like: GET https://outlook.office.com/api/beta/me/mailfolders/inbox/messages? $select=Subject,InternetMessageHeaders For Graph: The property also exists on messages in the beta endpoint for Graph, … Read more
Disclaimer: I’m a Microsoft employee. To retrieve and edit calendar events from Outlook.com, both Microsoft Graph API and Outlook REST API endpoints work. If you require Webhooks for an app you are planning to use in production, then you need to use Outlook REST API v2.0 endpoint. Microsoft has Webhooks available in Preview on Microsoft … Read more
At present we only allow access to mail, calendar and contacts belonging to the authenticated user. So, your scenario of an admin accessing the conf. room calendar is not supported at this time. Access to resources belonging to other users e.g. conf. room calendar is on our roadmap to support but we don’t yet have … Read more