I'm developing a system where users will be uploading documents. It will only support MS Office files 2003 and earlier so it currently barfs if the user uploads any of the x files (docx, xlsx, pptx).
I've found PHPWord in another SO question, but this does the exact opposite of what I need and also is still in what looks to be early beta.
Worst case scenario, are there any good libraries for conversion from these same MSO-X formats to PDFs?