The breadcrumb included in some portlets such as the Message_Boards-Portlet has been removed and centralised in Breadcrumb-Portlet. Thus, the only way to navigate from the current level of the portlet-hierarchy to the upper levels (eg. from thread to parent-categories in case of Message_Boards-Portlet) is using the Breadcrumb-Portlet. The Breadcrumb-Portlet is embedded in Liferay Portal Classic Theme, but not in the Social Office Theme.
This tickets aims to embed the Breadcrumb-Portlet in the Social Office Theme to allow Breadcrumb-type navigation in those portlets where this is provided.