The Spread of the Sapphire/Slammer Worm: The Sapphire Worm was the fastest computer worm in history. As it began spreading throughout the Internet, it doubled in size every 8.5 seconds. It infected more than 90 percent of vulnerable hosts within 10 minutes.

It looks like nobody is safe. Even if you don't use any Microsoft application or OS, you can still be put off-line by badwidth saturation. Whew...