I remember around 2001 I had to supply files to a commercial printer (to print 50,000 A4 fast food menus) and they refused to accept files output in coreldraw (they would only accept postscript files then - EPS) and they would refuse to accept PDF files full stop. But once they saw the possibilities of PDF they were fine. The is the great thing about PDF files, and we only accept PDF files, we don't care which software they are output from, as long as the standard is the correct one.