This is not so concerning to Linux users, but interesting. I got curious about just how good this product is, so I went to EICAR_DOT_ORG downloaded the four test files there. Under Windows 7
I could not download them at all, as they were recognized as viri. So I got them with Linux, which did not care, and saved them to an old USB stick. There are warnings about saving these to the hard drive, as a good AV program will not allow them to be moved, copied, or removed once they are quarantied.
Scanned with Win 7 MS SE: Correctly identified all four files.
Win XP Identified only the text file, but missed the others.
The scanning engine, and virus definitions were identical on both machines, yet here we are.
Gee I wonder if this is yet another incentive to upgrade soon.