I've yet to use a version of Word that can cope with large documents full of embedded images etc. without problems - I wonder how much of the core code actually gets changed between Office versions, because as far as I can tell Word hasn't really improved since Word 95, it just looks different each time...
When I was working on my Master's thesis, Word would randomly turn all the text into a Greek font and then disable Ctrl-Z (Undo) - very annoying when it's a Physics paper and there's supposed to be some Greek in there, so you can't just highlight all the text and turn it back into Times New Roman. Now
LaTeX, that's a proper way to do this sort of thing...
