HarePoint Discussion Board provides an ideal opportunity for interaction and collaboration among your team members empowered by discussion threads and feeds that deliver the ‘social’ advantages to the workplace.
HarePoint Discussion Board allows real-time discussion by showing all new posts, replies and comments in time of their appearance without page reloading. But the same SharePoint discussion board remains under the hood, so there is no problem with backup, migration, or maintenance. On top of that, you can connect HarePoint discussion boards to any existing discussion boards on your portal and empower them with a great user interface.
Please note HarePoint Discussion Board for SharePoint Online does not compatible with Microsoft Internet Explorer 8.