Finding free time in Office 365 via REST
Here is a two step tutorial of how you can find time in Office 365 calendars via REST
- https://blogs.msdn.microsoft.com/softwaresimian/2017/10/05/using-postman-to-call-the-graph-api-using-azure-active-directory-aad/
- https://blogs.msdn.microsoft.com/softwaresimian/2017/10/27/posting-messages-to-the-graph-api-from-microsoft-flow/
Enjoy