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For document management, Microsoft was going with something called "stacks." It was a nifty way for displaying, organizing, and sifting through documents. Also showcased in this image is a different look and feel for the glass borders of Aero -- something that quite frequently changed, albeit subtly, in multiple early builds of Longhorn.
Even when going out, Longhorn wasn't going to leave anything without style! Shutting down your system showcased a beautiful, full-screen aurora animation.
Longhorn wasn't going to be all flash and little substance, no. Microsoft worked hard to showcase how Longhorn would be both beautiful and functional for everyone from average home users to demanding professionals. With strong shell integration planned, apps would be made to run seamlessly between all components of the shell: the sidebar, windows, the taskbar, etc.
The next handful of images showcase ideas for a more professional Longhorn, without sacrificing performance or beauty (theoretically, of course).