Following my post The Evolution of the Microsoft Office UI (Ribbon) , this post will cover some Office 2007 prototypes demonstrated at “An Office User Interface Blog” by Jensen Harris. These screenshots provide some nice prototypes that were developed until a decision was made and Office 2007 got the UI that you are using today. (Also, take a look at the windows themes on some of the pics… those were probably the prototype themes for Windows Vista before it was RTM’d) ...