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With Vista just out the door, Microsoft is now drawing up plans to deliver its follow-up client operating system by the end of 2009, according to the executive in charge of building the product's core components.

That would be a much faster turn-around than Vista, which shipped more than five years after Windows XP, but Vista was exceptional, said Ben Fathi, corporate vice president of development with Microsoft's Windows Core Operating System Division this week at the RSA Conference in San Francisco.

"We put Longhorn on the back burner for awhile," Fathi said. "Then when we came back to it, we realized that there were incremental things that we wanted to do, and significant improvements that we wanted to make in Vista that we couldn't deliver in one release."

Vista shipped about two-and-a-half years after XP SP 2, and Vista's follow-up is expected to take about the same amount of time, according to Fathi. "You can think roughly two, two-and-a-half years is a reasonable time frame that our partners can depend on and can work with," he said. "That's a good timeframe for refresh."

That time line would put Microsoft's next client operating system out by the end of 2009.

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