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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).
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.