The 2.3 Chat tool (aka Chat1) permitted the instructor to set the default view for chat room participants. However, participants were able to change the default view of messages (ie see all messages, X # of days, or X messages). In 2.4 the Chat tool (Chat2) the options for recent chat messages restricts the messages available to all participants. In the vast majority of cases, this renders the view drop down in the chat room useless. For instance, if a room is set to display the past 3 days. Selecting to view All Messages will only show you all message for those 3 days.