Public Folders is a technology that allows user to share an information to other users and not to send them unnecessarily all information directly to their mailboxes. We can compare this technology with a "notice-board". Lecturers use a phrase "I have posted information on/to the public".
Public Folders can not be received on mobile devices!
Sign in to Office 365 (tutorial). On the left panel find Folders (Priečinky). Right-click on the link and click Add Public Folders (Pridať verejný priečinok).
You can also right-click Favorites (Obľúbené), then Add public folders.
Options you have selected will appear under Folders.