The reason stated for not upgrading (that 98 was more secure against worms and viruses these days) just seemed an odd reason to stay on 98, and didn't sound right.
I'll try setting up the 98 machine unprotected on the web tonight and see how long before it is hit, I'm interested. You could be right, but I can't see why a most current viruses wouldn't run on a 98 machine just as well as on a 2000 machine, but it will be interesting if true.
(The blaster worm didn't affect 98 machines, but I don't know about others)