PMFax Pro is now freeware.

PrimaFax Pro for Windows (download)
   Key: 10-00054-273-937-727-579-251

PrimaFax Pro for Linux (download)
   Key: 10-00042-185-182-616-225-873

PMFax Pro for OS/2 (download)
   Key: 10-00040-974-912-151-306-952