Came across the first Blackberry antivirus software from SMOBILE SYSTEMS . com which claims to address the recent malware threat announced at DEFCON.

Is this Antivirus required on bb? Wonder if RIM recommends such an antivirus software.

I think you'll find RIM would recommend protection server side by configuring your BES server in a segmented environment rather than installing some third party client side AV, which RIM would certainly not endorse.

Livelink - Redirection

Considering BB units run JVM it is nearly impossible to spread a virus to the units similar to viruses spreading across MS Email.