I am trying to view another user's inbox using Outlook 2016. I have shared the other user's inbox and gave myself review permissions. Then in my Outlook I clicked File / open / open user's folder / I then entered the other user's name. Their inbox appeared. If I navigate away from this I can't find the other user's mailbox anymore. But according to the following link the other person's inbox should appear in the Navigation pane under a "Shared" heading, and it is not. There is no "Shared" heading.