SonicWALL provides multi-layer defense against viruses. This approach protects users from known viruses as well as new, unique outbreaks. This real-time protection uses three types of anti-virus analysis. This comprehensive approach ensures that your e-mail remains secure before, during, and after a virus outbreak. Most anti-virus products rely primarily on signatures to stop viruses. These signatures are based on known viruses. Relying solely on this method leaves a dangerous window between the time a virus first appears and the time a signature is developed and deployed. At the moment the outbreak occurs - Time Zero - a virus has the opportunity to do significant damage to your computer system. Every passing minute until a signature arrives is enough time for a virus to multiply exponentially and compromise another portion of your network.