As new viruses and other Internet threats are written, released to the public, and discovered, Trend Micro collects their tell-tale signatures and incorporates the information into the virus/spyware pattern files.
Trend Micro updates the pattern file as often as several times a week,
and sometimes several times a day when people release multiple variants
of a widespread threat. By default, Trend Micro NAS Security™ checks
for updates once per day. If a particularly damaging virus is discovered
Pattern file, scan engine, and database updates are provided upon product activation.