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Xerox was never interested in the PC market, they created the GUI for their commercial printers and workstations. After they created it they saw a market in computer software companies, and created PARC, which is actually where most of the GUI features you see today were created and standardized. Here is a brief but good explanation of how the GUI came to be.
Not at launch. That would require WinFS, but they still haven't ironed out the metadata creation process yet. WinFS and it's subsequent features will be released sometime after launch as a Windows Update.