> That figure is almost entirely caused by one virus, that's been hitting us
> for the past 2-3 months:
> 
>  Malicious code found in file D:\LISTSERV\TMP\DO-NOT-RUN-ME-1502.EXE.
>  Infection: Exploit.IFrame.FileDownload

Actually, this is a delivery method rather than a virus, if I understood it correctly. The actual virus will vary.

  Eric