It’s worse than Code Red — the NIMDA virus infects both Microsoft’s Outlook as well as Microsoft’s IIS webserver. My server has registered between 3500 and 10000 infection attempts per site today.
If you run an Apache site and have PHP available, you can use my Webserver Virus Warning Generator to send warning emails to owners of infected sites. I’ve updated the script to handle NIMDA as well as Code Red.
It’s little wonder that insurance companies have begun charging higher rates for users of NT and IIS… crappy products beget higher maintenance costs.