Postini Perimeter Manager's gold medal in the messaging category is a victory for security sold in an on-demand model.

The product safeguards enterprises from malicious email and instant messages without the need for software installations, hardware deployments or on-site configuration. Readers lauded the product's uptime, noting that outages were kept to a minimum. The on-demand model results in cost savings, and it's headache free, says Sundar Raghavan, Postini vice president of solutions marketing.