Although this question isn\'t directly about code it\'s related to programming and seems better put here than, say, serverfault or superuser.
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The current IIS Express Overview says that VS2008 and VS2010 integration is going to come in a later release (presumably before the RTM release).
A future update to Visual Studio 2010 will add support for IIS Express. You can also manually configure Visual Studio 2008 and Visual Studio 2010 to use IIS Express.