The PDF viewer has a print button now ( which highlights the question of why was it not there in the 8.0 viewer. Who made that UI decision? ). 

But still, why do I have to use the metro PDF viewer at all?  I don't see how to view multiple PDFs in the desktop.  I can right click in the PDF viewer and navigate to multiple PDF documents. But alt-tab from the desktop only lets me navigate to the current PDF I have open.

And things like navigating from the PDF table of contents are harder to do. Search does not remember what I searched on before. And would be nice if I could use booleans in a search.

Can I go to the windows store and purchase a 3rd party desktop PDF viewer?