If you are using the mail server Microsoft Exchange Server 2003, it is recommended to install Kaspersky Security 5.5 for MS Exchange Servers 2003 to protect mailboxes and public folders against malware and unsolicited mail (spam).
If you are using the mail server Microsoft Exchange Server 2007,it is recommended to install Kaspersky Security 6.0 for Microsoft Exchange Server 2007 to scan mailboxes and public folders, as well as mail traffic passing through either Hub Transport or Edge Transport.