Listserv allows you to change your view of the list archives from Classic View to Forum or Blog view.

Classic view displays a list of messages in chronological order. You can search by Subject, From, or Date and also sort on those fields.

Forum view is like a message board where each topic is based on the subject line.

Blog view is similar to the Forum view but uses a custom style sheet NOTE:  The list owner must enable blog view in order to select that view.  

See L-Soft's Video Tutorial - How do I change my list archives into a  threaded forum? and How do I change my list into a LISTSERV blog?