Trouble upgrading to .NET 4 with VS2008. What am I missing?

I downloaded the .NET 4 framework from Microsoft here: http://ww开发者_开发技巧w.microsoft.com/downloads/details.aspx?FamilyID=9cfb2d51-5ff4-4491-b0e5-b386f32c0992&displaylang=en

I installed and rebooted.

When I go to compile options --> target framework... .NET 4 isn't on the list.

Is .net 4 not compatible with VS2008? It would be nice if Microsoft stated that somewhere...

You cannot target .NET 4 in Visual Studio 2008. You will need to upgrade to VS 2010 if you want to target .NET 4.0, or use a .NET 4 assembly in your projects.

Compatible yes (as it works when installed), but you cannot target .NET 4 using VS2008.