The major difference was that Vista (Longhorn) originally was meant to be powered by WinFS and Vista shipped just with Windows Search (the indexing service that was also available for WinXP as "Desktop Search").
For some unknown reasons the advanced search bar is absent in Windows 7+.
That history is funny. Win95 was also supposed to ship with WinFS, but instead it got only a "you don't ask for a find-like tool anymore" search window.
I don't know if MS finished the WinFS specification already.
I don't know if MS finished the WinFS specification already.