Antigen, a comprehensive antivirus, content-management, and e-mail security solution, today announced it has expanded platform support of its market leading technology to include Lotus Domino servers running IBM's AIX UNIX Operating System and OS/2. Antigen 6.0 for Lotus Domino running on IBM's AIX UNIX Operating System is available as a Beta release and Antigen 6.0 for Domino on IBM s OS/2 Warp is available as a licensed and evaluation download on Sybari s Website.