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Q: 

SL4 HttpPollingDuplex binding in IIS5.1

I am trying to add a http polling duplex service into my website. I am using IIS5.1 on Windows XP. When I add reference to the System.ServiceModel.PollingDuplex.dll (ver 4), VS gives me this warning:

"System.ServiceModel.PollingDuplex.dll", or one of its dependencies, requires a later version of the .NET framework than the one specified in the project....."

My question is if I don't change my project and IIS setttings (both still point to .net 2.0), will the service work? Do I need IIS 6 to host this service?

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