Though IEEE PDF eXpress accepts Word documents, I rather convert them to PDF so I can preview the final result. Most references out there on the web use Adobe print driver, but I prefer to use Word 2007 “Publish as PDF”. To embed the fonts please make sure to check the ISO 19005-1 (PDF/A) compliant option:
Please do it at your own risk, IEEE usually advises:
Print to a PDF Printer or PDF Distiller. Do not use any conversion wizards built into your word processor or "save as PDF" as they might add PDF bookmarks and Web links. Bookmarks and Web links are currently not allowed by IEEE library.