Microsoft has belatedly released a MOM 2005 management pack for the version 9.0 Antigen products (the next version being Forefront Security for Exchange 2007 and is currently in Beta). Microsoft says:
The new Microsoft Antigen Management Pack for MOM supports the 9.0 versions of Microsoft Antigen for Exchange, Microsoft Antigen for SMTP Gateways, and Microsoft Antigen Spam Manager. The MOM pack supplies critical events and alerts on virus, worm, and spam activity to MOM 2005, and also monitors the health and availability of these products.