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With Windows 7, the tree-style view of drives and folders is de-emphasized even more. The dominant navigation element is, instead, the collection of Libraries shown here, which combine multiple physical locations into virtual views based on file types or projects. Note that I've added the Software folder from a Windows Home Server to the default Documents library and created a custom ZDNet library containing one local folder and one folder from the server.
For more details, see the full companion post:A deep dive into Windows 7 (build 6801)