Born in "Longhorn," died in "Longhorn." The file system that never was. MSDN Magazine said the “revolutionary file storage system lets users search and manage files based on content,” but there’s one little hitch: WinFS never saw light of day. One of the major stumbling blocks on the road to getting Windows Vista (code-named "Longhorn" when in beta) out the door, the fully relational WinFS scheme looked great on paper, demoed well, gave rise to engineering flights of fancy -- and, in the end, just didn’t work. Some parts of WinFS are rumored to be living inside SQL Server.