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Here's another conceptual shot of a Plex-themed Windows Longhorn, circa 2001.
This is a Plex concept that extends even farther back in time than the previous two screen shots, thus showing the humble beginnings of a wild new look for Windows.
This screen shot represents early thinking for the carousel view: a view that would allow users to view the contents of a folder in a flashy, new way. Presumably, pressing the left and right keys on the keyboard would make items spin left or right, accordingly. This feature didn't make it very far, but it was implemented and working to some extent in early builds of Longhorn!