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Here's an example of Excel running within a Longhorn environment. Notice the email notification and tile in the sidebar, quickly giving users access to the most recent emails.
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.