However, despite the trendiness of Ubuntu Linux, the competence of Novell's SUSE Linux Enterprise Desktop or the resurgence of the Macintosh platform, Gartner analyst Michael Silver believes Vista's main competition is its own predecessor, Windows XP.
Silver said Microsoft has millions of customers that are happy with XP.
He expects Vista to overtake XP in early 2009.
- with Eric Lai and Sandra Rossi