Microsoft up to its usual tricks

In the new Office Vista Microsoft has some new UI stuff that looks cool. Office often sets the standard for UI as it is the most used application on Windows (apart perhaps from the browser). Micorosft is offering to license the new interface to you for free unless you compete with Word, Excel, PowerPoint, Outlook, or Access. Why is this sneaky? If Microsoft had put this UI into Windows then it would be available to anyone. By putting it into Office and restricting its licensing they are able to propagate their ideas while still bashing their competition.