title: Find mailbox delegates with Exchange Web Services (EWS)
body: <p>I'm currently developing an EWS client application under iOS, so I'm using the Exchange Web Services for communicating with the Exchange 2010 server (plain XML as opposed to the managed API).
  I am aware how to access the mailbox and calendar of a delegate and grant or delete delegate access to a mailbox, but before accessing I need to find these mailboxes first. That is, I want to find all mailboxes which my current user has access to (as opposed to all users who have access to the current mailbox, which is well-documented).</p>
  
  <p>This question from 2011 (<a href="https://stackoverflow.com/questions/7922408/ews-api-delegate-list">EWS API Delegate List</a>) indicates that there is no possibility, but without providing any references. I have not found any resources and no hints in the documentation, but Outlook easily identifies these mailboxes. Maybe it is using some internal API, I was unable to find the corresponding requests in its communication with the server.</p>
  
  <p>How can I find these mailboxes? Or is there still no way of achieving this, assuming the answer from 2011 was correct? If so, how does Outlook manage to do this?</p>