Dr.Web — innovation anti-virus security technologies. Comprehensive protection from Internet threats.

Dr.Web Mail Security Suite

Dr.Web products	Basic license	Additional components of Dr.Web
Dr.Web products	Anti-virus	Antispam	Control Center
Dr.Web Enterprise Security Suite
Dr.Web Mail Security Suite (for Microsoft Exchange Server)	+	+	+
Dr.Web Mail Security Suite (for UNIX)	+	+	+

Per number of protected users

Important! Quite often a redundancy is used for secure operation of servers (hot when all the servers are running at the same time, and e-mail is distributed with the load balancer among them, or cold when at any given time one server processes e-mail, and the either is waiting for the first to fail), or a full-scale cluster. Regardless of the number of primary and redundant servers, cluster nodes and balancers, the number of purchased licenses shall be equal to the number of hosts. Each server requires a unique Dr.Web key file.
If each server processes its own list of addresses, then a separate license is needed for each server.