In order to see E-Mail folders shared by other users, you have to subscribe to those folders.
How to subscribe to shared E-Mail folders:
Click the
icon on the right side of the menu bar. Click the menu item.Click on
in the sidebar.Click on
in the display area.In the Subscribe IMAP folders window activate the checkboxes of the folders that you want to subscribe to. Click on .
Also see:
Parent topic: E-Mails within a team