ActiveUpdate is a function common to many Trend Micro products. It connects to the Trend Micro Internet update server to enable downloads of virus pattern files, scan engines, anti-spam rules, and program files. ActiveUpdate does not interrupt network services, or require you to reboot your computers. Updates are available on a regularly scheduled interval, or on-demand.
You can configure PortalProtect to use ActiveUpdate as a source for manual and scheduled component updates. When it is time for the component update, PortalProtect polls the ActiveUpdate server directly, ActiveUpdate determines if an update is available, and PortalProtect downloads it.
New threats appear every day. Trend Micro recommends at least daily updates.