If you buy any laptop or shop for online from most of the manufacturer you will find about windows vista inbuilt , the various versions according to the price of the model and so on.
IBM recommends Windows XP Professional for their refurbished computers , though a handful are running Vista.
According to , Michael Horowitz , from defensive computing says in humorous style “A cynic might say that since most of their refurbs are running Windows XP, it’s marketing. Or perhaps the web page in question simply hasn’t been updated in over a year. IBM has no love for Microsoft, so maybe it’s just a cheap shot.”
Computerworld says in one of the article: “
Windows XP was chosen to run on all PCs handling chores vital to the Olympic Games and has been installed on most of the PCs delivered by Lenovo Group Ltd. Vista will be used only on PCs in Internet lounges set up for athletes to use during the games.
The Olympic Games require mature, stable technologies, said Yang Yuanqing, chairman of Lenovo, during a briefing in Beijing. The Olympic Games aren’t a place to try new technologies because of the size and importance of the event, he said. Everything must work smoothly”
According to RicABlair , he sounds in conclusive way is that: “Vista was not chosen probably because older machines can’t handle Vista. Even more likely is installing Vista means paying more royalties while XP has already been paid for with the original install. If you’re in the market for a "certified" PC (or previously owned) then you’re probably scrimping and not likely amenable to paying extra (built into overall cost) for a new OS.”
Root: Defensive Computing