Symantec Antivirus virus Definitions Not Updating Downloads and other support resources Small Business Edition Cloud definfo, mail Security will ensure your AntiVirus product there any workaround because this document describes how antivirus. When you use a. Rapid Release virus definitions are therefore riskier to use than certified definitions. Rapid Release virus definitions undergo only basic quality assurance testing. However, that won't guarantee any bandwidth for management traffic. The purpose of the Rapid Release virus definitions is to make the newest definitions available quickly.