The Summary is misleading but the problem didn't end in 2005.
Replacement parts were just as faulty as the original parts and continued to be shipped to customers at least 4 years after they started selling new PCs with those parts and a least a year or two after warranties expired. Worse for people that didn't have warranty coverage and paid hundreds of dollars for a replacement motherboard. It's bad enough when you get your replacement part for "free" and it works worse than what you had before, it's even worse when you pay hundreds of dollars for a replacement part that doesn't work properly.
Now you can talk about how stupid it is to buy a replacement motherboard from Dell when a new PC is only a few dollars more but we are talking about businesses here. Full of stupid procedures that waste money on a regular basis.
I'll add to the trivia here by mentioning the there is a revision of the GX270 that has the same motherboard as a revision of the GX280. I wouldn't know except I worked for a corporation that had hundreds of PCs in the GX260, GX270, GX280 models and management made the bad decision of replacing all motherboards "proactively" (the catch being this was a reactionary way of going proactive, any other time I'd ask them to be proactive they'd avoid it). So we literally sent away working motherboards with no observed issue only to receive replacement motherboards with even worse bad caps on them and got into situations where Dell had already taken away the good motherboard couldn't replace the bad replacement motherboard due to shortage of parts.
I'm at a different company now but even here we have a handful of those bad cap Dells in daily use. If we keep up the pace of PC replacements the last of the 2005 bad caps PCs will be replaced here some time in 2011. I wouldn't have to assume there are millions of these junky PCs still in use in businesses of all sizes, homes, churches, and schools across the US. Think about how many companies provide PCs for telecommuting or donate PCs to schools/churches/employees. These things are like the PC equivalent of a cockroach.