From PC World.

"Unless you've been living under a rock for the past few months, you probably know that the latest version of Windows--called Vista--is due to hit store shelves later this year (in time for the holidays, Microsoft tells us). The successor to Windows XP offers a little something for everyone, from eye-catching graphics and new bundled applications to more-rigorous security. In fact, there is so much in the new operating system that it can be tough to get a handle on it all.

I've been noodling around with a recent beta version of Windows Vista (Build 5270) and had a chance to make some observations. While the sleek new look and polished interface caught my eye, it's what's under the covers that impressed me most. Microsoft's done a great job of improving security across the board. Things like Windows and spyware library updates are streamlined, and I definitely appreciate the more robust Backup software.

Still, there's plenty of unfinished work left to do. Internet Explorer 7 struggled to properly render some Web pages, and I found local network connectivity to be a hit-or-miss affair. And then there's the stuff that isn't even in there yet--like the intriguing Windows Sidebar, which will put real-time weather info, stock quotes, system status, RSS feeds, and other information on the display.

So during my time with Windows Vista, I kept an eye out for the reasons I--and you--might ultimately want to lay my hands on the new OS when it's available. And frankly, if you buy a new Windows-based PC at the end of this year or any time in, say, the next five years, you'll probably end up with Vista by default.

Keep in mind, this is based solely on my experience with prerelease software (and a whole new beta could be out by the time you read this). Features get tweaked, they come and go, but from what we can tell, Vista is now starting to harden into the product that will be running many, many desktops for the foreseeable future. And by and large, that's a good thing. "

Click for the reasons - http://www.pcworld.com/reviews/article/0,aid,124642,00.asp