Microsoft is claiming that the uptake of its Vista operating system is strong.

Chief Executive Steve Ballmer admitted to an industry group in Zurich that while there had been compatibility issues with Vista. Most of these were due to inbuilt security features in Vista clashing with people's applications and this caused more problems than Microsoft anticipated.

However, businesses are shifting to Vista at around the same pace as was the case with XP. On the consumer front, uptake has been "instantaneous," in the sense that new computers sold today are equipped with Vista as the standard.

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