> The product is called HSnetcheck and comes in a couple of different flavours. The URL is www.shavlik.com
> You can configure it to automatically do the scans and updates or manual updates, you have full control.
>
> Also there is a free download of the pro version for evaluation.

Thanks, I'll take a look. It appears like HSnetcheck is actually a Pro version of MBSA. MBSA is the free MS tool (and Shavlik is listed as an author of it). MBSA works okay and runs on remote servers - it does what you want, basically, but it's much too slow for scanning a large network with 400+ servers in one weekend. Maybe the Pro version is faster, hopefully.