title: Exchange EWS: How to get all appointments in a room
body: <p>I am trying to get all Appointments of a Room in Exchange via Exchange EWS.</p>
  
  <pre><code>ExchangeService service = new ExchangeService(ExchangeVersion.Exchange2010_SP2);
  service.UseDefaultCredentials = true;            
  service.AutodiscoverUrl("hans.muster@domain.com", RedirectionUrlValidationCallback);
  
  // Return all the room lists in the organization. 
  EmailAddressCollection roomLists = service.GetRoomLists();
  
  System.Collections.ObjectModel.Collection&lt;EmailAddress&gt; rooms = service.GetRooms("ZimmerZuerich@domain.com");
  
  EmailAddress roomAdress = rooms[31];
  
  FolderId folderid = new FolderId(WellKnownFolderName.Calendar, new Mailbox(roomAdress.Address));
  FindItemsResults&lt;Appointment&gt; aps = service.FindAppointments(folderid, new CalendarView(DateTime.Now, DateTime.Now.AddHours(24)));
  </code></pre>
  
  <p>If I run this code I get an error message stating: </p>
  
  <pre><code>{"The specified folder could not be found in the store."}.
  </code></pre>
  
  <p>And indeed if I show me a collection of all folders for such a room mailbox, there are no folders inside it.</p>
  
  <p>What am I doing wrong? All examples in the internet work with WellKnownFolderName.Calendar.</p>