At the RSA Conference in San Francisco recently, Ben Fathi, corporate vice president of development with Microsoft's Windows Core Operating System Division has gone on record as saying the next version of Windows, known to be called Vienna will be out in the summer of 2009.
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 time frame for refresh."
2007 = Vista
2007 + 2.5 yrs = Summer 2009
Dont say you havent been given enough notice to start saving for the next version of Windows
Steve