> or do the latest versions of the Office suite now include a export to PDF?
They do. They also support ODF.But this doesn't sound to me like a problem with formats. It sounds more like a problem with this particular file. Maybe the file is just so large that it's taking a long time to open? Or maybe there's something about it that LibreOffice doesn't expect? Or maybe you're running out of RAM and going into swap? Hard to say without seeing the file.
