20 years back I was excited by the prospect of a version of Windows that replaced the DOS based file system with a database based system called WinFS, although disappointed that it was forever delayed. I continued to be excited by the prospect that it may ship as an add-on for XP and Vista. Another year passed and that idea was also canned.
This post on The Register caught my eye this week, discussing some history behind Longhorn, and an overview by Dave Plummer over on his YouTube channel. Fascinating to hear some of the behind the scenes story, but sad it never saw light of day.