When Microsoft Corp. released Windows Vista to businesses exactly one year ago, near-term expectations weren't high.

Experts widely predicted that Vista, even if it was bug-free and proved to be an immediate hit with consumers, would only slowly catch on with corporations.

For instance, Gartner Inc. forecast at the time that fewer than 5% of PCs worldwide would be running a business version of Vista by the end of this year.

One year on, it's unclear whether Microsoft has met even those pessimistic projections. In July, Redmond said enterprises had renewed 42 million Windows licenses that made them eligible for Vista. Trouble is, Microsoft also admitted that the vast majority of those 42 million PCs were likely still on XP, though the company claims it has no accurate way of tracking this. Microsoft has not provided a more up-to-date figure in the last 4 months.

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Windows Vista, Microsoft