From the developer: "1st Email Anti-Virus is the only security program that protects from all email threats. Other generic antivirus programs and setting most secure options in email client software can't provide the same level of protection as 1EAV. It copes with iframe / MIME header / CLSID extension attack, script attacks, ActiveX /Java / Flash attacks, 'web bugs', fragmented message attack, etc. The program is compatible with any POP3 email clients, such as MS Outlook, Outlook Express, Netscape, Eudora, etc. Designed for discreet users who appreciate data integrity and privacy, 1st Email Anti-Virus is a must have for protection from internet mail threats."