I recorded an episode of the RunAs Radio podcast as a guest with MVP Richard Campbell a couple of of weeks ago, where we talked about Exchange Modern Public Folders:
Are Public Folders evil? Peter Schmidt says no! Richard chats with Peter about Modern Public Folders that come with Exchange 2013. Treated more like regular mailboxes (only BIGGER), the public folders in Exchange 2013 are much easier for the administrator to handle while being essentially the same as far as the users are concerned. The migration is a bit tricky, but you can do it on-premise as well as to Office 365. Peter has a great video about migrating to 2013 public folders from NICConf. Check it out!
If you want to know more about Modern Public Folders, watch my session from NICConf 2015 about migrating to 2013 public folders from NICConf.
Read more about Public Folders on the Technet documentation: Exchange Public Folders.