Microsoft Vista: What you need to knowEverything about the new operating system, including whether you should buy it now.NEW YORK (CNNMoney.com) -- Six years and $6 billion later, Microsoft's Vista finally hit store shelves Tuesday - the software company's first upgrade to its dominant computer operating system since Windows XP in 2001. Also new from Microsoft (Charts): overhauled versions of its popular Office software that includes Word, e-mail and other applications used by hundreds of millions of people around the world every day.
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