A user has, in addition to their own mailbox, a shared mailbox in Outlook 2016. It says there are 3 unread emails, but none are visible. At the bottom of the pane it says "displaying messages newer than 12 months". Maybe the 3 are older than 12 months? But I don't see anywhere to adjust the shared mailbox settings so we can see older than 12 months. Where is that adjustment made?