4D, Inc. today announced the release of 4D WebSTAR V 5.3.1, an update to 4D WebSTAR Server Suite V, now with Norton AntiVirus email filtering support, spam filtering in 4D WebMail Pro, a new 4D Dynamic Data Indexer (4D DDI), and more. Version 5.3.1, which is a free update for all currently registered users, also includes CGI, FTP and several other reliability improvements and plugin enhancements.