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Home use has already (somewhat) been established, but I'm curious about business users. Approximately, what percentage of business users worldwide have .NET 3.5 runtime installed? Client profile will do, since that's what I compile my app to (though others may be interested in the full, so maybe answer that too).

I'm only looking for rough estimates, but I'd like to hear separate percentage figures for: 2.0, 3.0, 3.5, 3.5 CP, 4.0, 4.0 CP, 4.5

(note: percentages won't total 100%, since many users can have two or more .NET versions simultaneously).

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Depends on business area, locale, the specific business and more. This is not answerable. –  Oded Sep 23 '12 at 18:28
    
this is very wide question, you have to define the region and type of business to get a better picture –  Yusubov Sep 23 '12 at 18:29
    
Worldwide usage. An average, since I'm only looking for a ballpark. –  Dan W Sep 23 '12 at 18:29
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closed as not constructive by Oded, Yusubov, World Engineer, Walter, gnat Sep 24 '12 at 6:19

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2 Answers

It is not how many do have it installed. It is about how many are able and willing to install it.

When you develop software for business, you usually make minimal system requirements. .NET can be installed quite easily, so it all comes down to if business is using Windows on their PCs and if they are willing to install new system component to use your software.

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Stat Owl has a list of general versions installed. I'm not sure how accurate their methods are for business users since they collect data from web browsers. I think you'd be pretty safe using 3.0+

The .NET environment is made to backward compatible but Microsoft can't guarantee this and recommends testing.

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Can a .NET 3.0 application run on a platform which has the .NET 3.5 runtime? How about the .NET 4.0 runtime? –  Dan W Sep 23 '12 at 21:40
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