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Since SharePoint 2010 Service Applications are abstracted out, is there any way to develop Service Applications using the .NET 4.0 or 4.5?

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Yes; you can, for example, create a WCF service application using .NET 4.0 or 4.5 and consume that WCF service application in your SP code (SP 2010 Service Application) or even from InfoPath forms or Java...

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