I hooked my phone via USB to my computer and couldn't find the PDF's on my phone while searching on my computer. I looked on my phone and they were there when viewing via the PDF viewer. While in the PDF viewer, if you tap and hold, a menu appears that allows you to delete or share (via SkyDrive) with a shared link. Alternately I used my PC and copied PDF files into the Documents folder on my phone. They will then show up in the Office hub / Places / Phone (documents on your phone) but oddly enough not in the PDF reader. From the Office Hub if you tap and hold the PDF document, you can Share...via email, Save To....SkyDrive or Delete. It is odd that if you copy them to your Documents folder on your phone, they don't show up in the PDF reader app. And when you have files that show up in the PDF app, you can't see them in the Office Hub.