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How many computers are in the world?

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At least 500 Million computers in the world, thanks for asking..
Just read a new estimate (10th June) of 900 million personal computers, plus all the corporate machines.
Amazing, but still behind cell phone penetration: 4 billions by October 2009...
As of April 2002, 1 000 000 000 (one billion) personal computers have been shipped, and there will be 2 000 000 000 (two billion) by 2007; according to Gartner Dataquest.
However, Forrester Research says that in 2008, there were only 1 000 000 000 (one billion) personal computers IN USE. This is mainly due to the quick rate that technology becomes obsolete.

In 2012, there were 10.8% more computers sold than in 2011. In 2012 alone, 220 000 000 (220 Million, or 0.22 billion) computers were sold. Therefore, as of 2012, there are appropriately an additional 0.8 billion computers added to the total figure of personal computers in the world, with a slight reduction in the figure of those in use.

Total shipped: approx 2.8 Billion
Total in use: approx 1.4 Billion


NOTE: personal computers include laptops, smartphones, PDAs, tablets and desktops. does not include individual microchips such as those in digital watches, nor does it include simple cellphones such as old flip-phones.
It's estimated that there are between 900 million and one billion personal computers in the world right now (with two billion to be reached by about 2015). The total amount of computers in regards to offices and corporations and such is much higher, and I don't know that.
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