Linked by Thom Holwerda on Wed 16th May 2007 22:55 UTC
Windows Nearly 40 million copies of Windows Vista have been sold in the first 100 days following its release, more than twice the sales of Windows XP over the same time period, Microsoft Chairman Bill Gates said in his opening keynote here at the 15th annual WinHEC. "We have been amazed by the response to Vista and what has happened in the last 100 days. So, in the first five weeks of shipping Vista, we have matched the installed base of any other operating system provider," Gates told several hundred attendees in an address entitled 'Platform Innovations for Today and Tomorrow'. In addition, Microsoft said that the follow-on to its Windows Server 2008 operating system will be an interim release due to arrive in 2009.
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Putting 40 million into perspective
by michi on Thu 17th May 2007 06:06 UTC
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I have never had as much fun as looking at these figures. Growth is linear not exponential. People replace there computers every 5-6 years, and yes it *did* take xp 6 years to get 75% of the desktop market.

Actually I think growth is exponential. To make the calculation easier, suppuse 50% the people by product per year. What do we get:

First year: 50%

In the second year, 50% of the remaining people by the product, thus:

Second year: 75%

In the third year 50% of the remaining people by the product

Third year 87.5%

And so on.

This is of the form 1 - exp(-x) which is exponential.

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