Windows Vista users jumped at Microsoft's troubled operating system's first service pack, but people running Windows XP haven't been in much of a hurry to install its newest service pack update, a Windows performance and metrics researcher said Thursday.

According to Devil Mountain Software, by the end of July, 86% of the machines in its community-based Exo.performance.network (Xpnet) running Vista had been upgraded to Service Pack 1 (SP1).

That was a 17-point increase over the 69% who reported running Vista SP1 at the end of April, six weeks after Microsoft released the major update.

"There was pent-up demand for Vista SP1," said Craig Barth, chief technology officer at Devil Mountain. "If users are frustrated with a platform, they're going to be more likely to go out and snag any update that purports to fix the problems."

Meanwhile, Windows XP users have apparently felt less pressure to download and install that aged operating system's Service Pack 3 (SP3), which was released in early May.

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