Sorry, Rob, the newest Word viewer is for Word 97/2000.  It should be
able to open most Word 2003 files, because the file format is the same,
but there might be some newer features in Word 2003 that the viewer
doesn't support.  If your co-workers have Word 97, 2000, or 2002, then
they should be able to open most Word 2003 files with their older
versions, except that some newer features won't be supported.  If you
need to make your Word 2003 files 100% compatible with older Word
versions, click on Tools | Options | Save | check the "Disable features
introduced after" box, and choose the version.