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Vote for Sophos UTM software appliance
The Sophos UTM software appliance integrates all security applications with a hardened OS. These are bundled within a single software image for easy deployment on hardware of your choice. The self-booting software package installs on a dedicated Intel-compatible computer within minutes. In addition to the full feature set offered on the pre-installed hardware appliances, Sophos UTM software appliances provide the freedom to change or upgrade the underlying hardware at will.