My girlfriend recently got a new Macbook, and when she emailed herself some .docx files from her PC, they refused to open in Office 2008, with an error that says something like "unknown error 2". They open in TextEdit, but none of the math expressions show up. Is it a known problem that Office 2008 can't open Docx files that have expressions in them? Will she have to use BootCamp to remedy this problem?