The lovely argument of computers LOL
Macs do have a longer life span, before you say things please do your research. We have a lot of back-up storage (if you use .mac services) I have had my imac G5 since Dec 04, no regrets whatsoever. Waiting on lepard to install, only a few more days. I know someone who bought a computer about 2 months before I did, guess what they are buying after Leopard comes out?? a mac
and I know one of the creators of Vista (a company was hired to write the programs) and they are mac users all the way

Vista was made to compete with the uprising of the mac line(Panther/Tiger/Leopard) I have to get ready to go somewhere, but will try to remember to look for article later. But Vista is stated to be a baby to Panther. The mac line is much more advanced. That is why Vista was created, competetion.