It said the worldwide PC market is still on track for 300 million units sold in 2009, in line with previous In-Stat estimates.
"With the recent release of Vista, a short-term rise in PC demand is anticipated," said In-Stat analyst Ian Lao.
"System sales that had been muted waiting for systems pre-loaded with Vista rather than XP are expected to work through sales channels in the next two quarters.
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“However, these sales represent an offset from last year rather than actual new demand creation."
In-Stat says corporate buying cycles continue to be the dominant factor in enterprise demand for new PCs.
Average consumers wanting Vista are also more likely to purchase an entire new system instead of a system upgrade.
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