WinFS was supposed to be the successor to the NTFS file system, & incorporate tons of new features along with stability enhancements. Now it's just another in the growing list of disappointments from MS lately. Vista, anyone?

"Although the status of WinFS has already changed a number of times, it seems Microsoft has finally given up on once-lofty plans to completely re-architect the way Windows stores files. The idea of WinFS, or Windows File Store, was to create a "sea of data" that abolishes the need for the standard file and folder hierarchy."