I would like to improve the KMail user interface by introducing some new features and in the meantime help in the native Qt4 port. The main task would be to create a new message-list widget with great display capabilities and possibility of message grouping. The secondary tasks would be to implement a full-thread message view and help in remodeling the existing list/tree widgets in order to use the new Qt4 model-view approach. As a side effect I would also take care of some of the UI-related bugs and wishes reported by the users on bugs.kde.org.