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Here's an example showcasing Microsoft's preview pane, where just about any type of information could be shown about a document, application, or anything else that could take advantage. Developers were going to be given access to APIs that would allow them to code whatever they wanted from their application into the preview pane.
This screen shot shows a lot going on: document stacks, preview pane information, contacts in the sidebar, and more. Longhorn was going to make the most of providing as much information as it could, all in the most attractive way possible.
Though you can't tell, the seemingly static image in the preview pane was actually an animation! In fact, the preview pane could consist of all moving parts, if a developer wanted to do as such for their application. In some of the later pre-cancellation builds of Longhorn, Microsoft included preview pane auroras, which all varied in color (depending on the type of folder that was opened) and were coded in XAML.