Why not install 7.2 BETA on your test system over the weekend? It also includes the brand new WebApp 2.0 More info: http://t.co/XxGEeOYU0W
A stub is a pointer left in the primairy ZCP server that points to the actual message inside the Zarafa Archiver server. When selected the message in the primairy ZCP store is "de-stubbed", which presents the user with the content that has been retrieved internally form the Zarafa Archiver server. All this without the user having to do anything special.