iPad: The export feature in Office for iPad is buried away and only lets you export a PDF as an email attachment. That means you can't save it locally anywhere (or in the cloud). Macworld figured out a way around this using If This Then That.
Macworld uses an IFTTT recipe where you still email the PDF attachments, but it lands in your cloud services of choice. This way, you'll have a copy available on all your computers or for sharing with others easily. It's still a bit clunky, but it's better than having to export the PDF to an email, download that email and then move it to a folder.