Scanning For Windows Viruses Using Unix?

Webmoth asks: "As a networking consultant providing services to small businesses, I find myself installing an increasing number of Linux/Samba servers. Many of these clients are now getting always-on Internet connections with static IP addresses so that they can have an in-house mail server on that Linux box. I am concerned about the increased possibility of viruses infecting their network because of this. I'm not worried about the Linux box contracting a virus (that typically requires user intervention), but would like some solution, a software package running on Linux, that monitors for Windows viruses as files are accessed on the Samba server. It would be nice if there was a module that interacted with Sendmail to block e-mail viruses, too." Remember, many solutions that work for Linux will work for other Unixen as well. Unix machines typically act as mail servers for most enterprises so it would help prevent e-mail virus outbreaks if scanning can be done at the server level as well as the client level.

"Ideally, this Linux antivirus product would act as a server to provide virus definitions and scan control to Windows clients (much like Symantec's Norton Antivirus Enterprise Solution, formerly Intel's LanDesk, which is a great product but Windows-exclusive), as you can't trust users to maintain their virus software. Symantec had a press release back in April which seemed to indicate Linux support, but a knowledge base article posted the following day reveals that support is provided by scanning a shared Linux filesystem that can be mounted by a Windows box running Norton Antivirus. I'd like to see real Linux support. Anybody know of a practical solution?"