Our excitement at the potential of CloudOn, a tablet app which provides access to Microsoft Office apps, was rapidly tempered earlier this year with the realisation that the Android and iOS apps weren't available in Australia. Fortunately for us, that has now been remedied and both free apps can be downloaded from their respective local stores.
On both platforms, you essentially log into a virtualised version of Microsoft Office, which lets you access the full set of desktop features. You wouldn't want to use it as your main interface with Office, but for quick reviewing or creation of documents when you only have a tablet to hand, it's very useful and entirely cost-free. (You can grab existing files from Google Drive, Dropbox or Box.) There's also built-in access to Adobe Reader.