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You could give Documents Free (Mobile Office Suite). It’s not the “fanciest” office suite, but it is Dropbox compatible and covers the basics. Plus, as the name suggests, it’s free, so you don’t have anything to lose if you give it a try. The only potential issue is that while I know you can use Word or Excel to open documents created in, er, Documents, but I am not 100% certain that you can edit existing Word or Excel files in the app.