I always use my last workspace (workspace 4) for email and instant messaging. In KDE I could use the window menu (right-click on title bar) to tell KDE to move new Thunderbird and Pidgin windows to this workspace automatically when opened.
Apparently, according to this question, one could do that in Ubuntu 10.04, too, using the ‘Always on this workspace’ menu item in the window menu. However, in Ubuntu 12.04 there is no such menu item.
So, my question is this: How can I make an application open on a specific workspace in Ubuntu 12.04 with Unity?