I'm building an application for sharing office 365 emails between the users within an organization. I have a problem for uniquely identifying an email which is part of many users' inbox.
In detail, User A sends an email to user B & C, all are within a same organization with a domain abc.com. I tried with Office 365 Graph Mail API and i checked against each users individual mail box where same email appearing with different ids. Is there any way to uniquely identify the email for different inboxes?
When I tried with the Calendar API, there is a property called 'icaluid' which can be used for uniquely identifying the event across shared calendar views. Is there anything like this support for Mail API?
You might try the InternetMessageId property, which is available in the Beta version of the Outlook API (make sure "beta" is selected at the top of the page). If you're using Graph, it's on the v1.0 version of Graph.