By storing the most time-sensitive virus/malware information in the virus patterns, Trend Micro minimizes the number of scan engine updates while keeping protection up-to-date. Nevertheless, Trend Micro periodically makes new scan engine versions available. Trend Micro releases new engines under the following circumstances:
Incorporation of new scanning and detection technologies into the software
Discovery of a new, potentially harmful virus/malware that the scan engine cannot handle
Enhancement of the scanning performance
Addition of file formats, scripting languages, encoding, and/or compression formats