Creating an outlook appointmet in the users personal calendar
You can use the second link for creating an appointment.
Use a REST-Call action to the URL mentioned:
Then you build your request-body (in JSON):
Here you can edit your appointment infos (e.g. “subject” would be the title of the appointment, “attendees” would contain a list of email adresses).
Here is a large list with attributes that you can set for the appointment via the REST API.