Is there a free Office App for the iOS to read Word, Excel, PowerPoint & OneNote files? I've looked around the AppStore for this but have not found one yet. Maybe my keywords are all messed up. Is there an app that will allow me to read files created by Microsoft Office on the iOS?
These can be displayed by IOS with no software involved, other than OneNote.  The trick is getting the files onto the device.  Email is one way; you can view these files, other than OneNote, as attachments, using the ioS Mail app.

Another alternative is to use a sync service client (e.g. dropbox) to access the files.