title: Exchange Web Service FolderId for a not well known folder name
body: <p>I have a folder in an Exchange mailbox that is a child of the root (not Inbox).  </p>
  
  <p>How do I get the ID of such folder using EWS Managed API?  </p>
  
  <p>Only examples I find are those relating to WellKnownFolderNames.   </p>