TFS 2008 to Build VS 2010 Projects - what version of VS should go on the TFS Server?

I need to get VS 2010 projects that are using Visual Studio Tests building on a TFS 2008 build server. I didn't want to have to install VS 2010 but am now willing to do so after trying the advice one person posted here:

http://开发者_开发技巧www.richard-banks.org/2009/11/how-to-build-vs2010-solutions-using.html

and some other posts I've found but am still getting errors from the VS Test dlls.

What version of VS 2010 do I need to install to support builds with VS Tests for a TFS 2008 build server?

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I was able to get VS 2010 projects to build using TFS 2008 source only by installing Team Foundation Server Build and Team Foundation Server 2010 Build agents. I also had to install Microsoft Windows SDK for Windows Server 2008.

I followed the advice here as well to set TFS 2008 build agent to use .net 4: http://www.richard-banks.org/2009/11/how-to-build-vs2010-solutions-using.html