I opened a Word document (.docx suffix) in Word on my Windows Phone 8. It worked fine to view the document.
But when I tried to edit the document, I got a message box that says:
Can't edit. Unsupported content. This version of Word doesn't support some of the content in this document. You won't be able to make any changes.
How can I find what that "unsupported content" is and get rid of it so that I can have a document that I can edit?