Why by the ____ don't you make that available in VS2008.
When a company pays for the VS2008 pro version and acquired it in 2009, they don't expect the need to upgrade it before 3 years at least.
The problem here is that we as developers can hardly justify the need of purchase of a new version so why don't you plant to get a VS2008 addon for that ?
If you can't justify then don't buy. Express editions are free. Open your pocket when you can get profits from customers.
The customer usually does not care whether you are using EF1 or EF4 by the way, as long as the product works.
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Visual C++ MVP