Office365 API access for all network users' calendars using c# - outlook

Question

So my main objective is to update network user's outlook calendar from sql server data using office365 api every few minutes. I am stuck at how to get access for other user's outlook calendar? Looked at below link but didnt asnwser much...do i need azure subscription in order to do this? If someone can point me to right direction, that would be great
https://msdn.microsoft.com/en-us/office/office365/howto/common-app-authentication-tasks

Answer 1

I am stuck at how to get access for other user's outlook calendar?
In this case, you can consider using the application permission.
In Azure AD:
register a Web Application in your Azure AD.
add “Read and write calendars in all mail boxes” permission
generate the application secret key
In your application, call Office 365 Graph API - create events by using application token.
http://graph.microsoft.io/en-us/docs/api-reference/v1.0/api/user_post_events
var tmgr = new ApplicationTokenManagement();
var token = tmgr.AcquireToken(Settings.ResourceUrlOfGraph);
var api = new Graph.GraphCalendarAPI(token);
JObject body = new JObject
{
{"subject", "Create from Office 365 API"},
{"start", new JObject { { "DateTime", "2016-03-09T00:00:00"}, { "TimeZone", "China Standard Time" } } },
{"end", new JObject { { "DateTime", "2016-03-10T00:00:00"}, { "TimeZone", "China Standard Time" } } },
{"isAllDay", true }
};
var task = api.CreateEventAsync(body, "user#youcompany.com");
task.Wait();
You can find the complete sample here.