I wish the Swing browser were better, or that we could bundle Rich's NetBeans/JDIC native web browser integration for Windows. That would make the end result, at least on Windows, quite a lot prettier. However, there's clearly some progress in our porting procedure, from our original Swing application to a modular NetBeans Platform application. Next step is using the Navigator to display subject lines and so on.
By the way, notice that we now actually have a functioning mail browser, albeit a pretty basic one. It looks a lot more like a typical NetBeans Platform application than our simple TopComponent integration, back in step 2 of this series.