Some of you know that I've been an Open Source/Linux advocate since 1996. I rarely waste an opportunity to unfurl the Linux banner, and wave it proudly in the faces of those who are afraid to detach themselves from M$ umbilical cord. In fact, I no longer use M$, err I mean Microsoft products at home. One of my friends recently learned that their outgoing mail (SMTP) service was interrupted by their ISP, b/c their Outlook inbox was infested with the Netsky/worm.
So unknowingly, they had become a spam relay, and their ISP shut them down without notification. Recognizing their ISP's concern for their other customers, I understand these actions, albeit pretty nasty.