I'm trying to develop a application for syncing calendars & contacts to another system. The application is written in C#, but I don't understand how I can get all user's calendars and contacts, without knowing each one's credentials. The application shouldn't poll the information, but send it to my application like an event.
I already searched on MS sites, downloaded the 'Exchange 2013 101 Code Samples' ans successfully wrote a script which sends an e-mail to another user, but the authentification only worked with user credentials.
Is it possible to create a 'master' user who can read all calendars and contacts of a given list of users? Can ExchangeServer call my application and send the information (e.g. with SOAP), or do I have to poll?
UPDATE:
I created a user who has full permission on everything, but I don't know how to read the data from the server, because the calendar of the 'master' user is empty. When I visit OWA and choose to take an impersonate look into someone's calendar I can see the appointments.
Code for permissions:
Get-Mailboxdatabase | Add-ADPermission -AccessRights ExtendedRight -ExtendedRights Receive-As, Send-As -User "<SuperAccount>"
And this one shares the calendar:
Add-MailboxFolderPermission –Identity <MailboxFolderId>:\Calendar -AccessRight ReadItems -User <SuperAccount>
How can I get the calendar of a user with my master-user?
According to Jan Doggen's answer I found the solution in another StackOverflow thread, which can be found here: EWS: Access shared calendars
The answer from Seph was in Visual Basic, but it can be easily converted to C#:
using Microsoft.Exchange.WebServices.Data;
DateTime startTime = new DateTime(2013, 1, 1);
DateTime endTime = new DateTime(2013, 12, 31);
var cal = new FolderId(WellKnownFolderName.Calendar, new Mailbox("other user's email"));
var calendarView = new CalendarView(startTime.Date, endTime.Date.AddDays(1));
foreach (var appointmentItem in service.FindAppointments(cal, calendarView))
{
Console.WriteLine(appointmentItem.Subject);
}