>Well, actually... user tests show that the Ribbon can actually be good when it's well designed, and lots of people around the world use Office 201x without lots of problems. Some people actually conducted PROPER testing on it.
An user interface which takes lots of vertical space which is at premium instead of being on the sides which are much less used, "PROPER testing"?
Somehow I doubt it!
Speaking about failure, I remember the Gnome's decision to use "spatial browsing" which was backed supposedly by usability research, they had to revert it in the end.