“One might say it’s not that big a deal, considering we are just talking about Windows Vista. Still, according to market research firm the NPD Group, WIndows 7 outsold Windows Vista in terms of retail boxed sales by 234%.”
It think the reason why windows 7 outsells vista is because most of the people didn’t like vista that much because i think there are complications. And maybe people heard from other people who installed windows 7 said that is way better than vista so most of the people who uses vista bought windows 7 that’s why windows 7 was able to outsell vista by 234%
Site: Windows 7
