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Have you used the release version (not the preview)? Outlook has both dividing lines and a light grey theme (which slightly greys adjoining portions of the UI to make divisions more clear). Also, basically everything is clickable...

There are plenty of dividing lines

http://i.minus.com/ibm6UEFR5wXRGJ.png

I personally like the new UI, I find it refreshing.

I agree, but only because the office installation in this screenshot is set to use the darkest theme -- by default all that gray is just more white.

WP8 suffers from similar problems, including the schizo approach to capitalization.

agreed. I like the Metro design the for the OS but for Office it's terrible. I think Metro is only good for designs that have a lot of white space. For something like Excel you need a little bit more detail to show what's clickable, ect...It's the same problem for Rdio's app.