After installing Studio Enterprise Edition 6.0 you open Visual Studio 2008 and you are not able to see the Enterprise Server regions in the Server Explorer tab of Visual Studio.

To be able to view the Servers in the Visual Studio Server Explorer you will need to do a repair on the Studio Enterprise 6.0 installation. You can do this by going to Control Panel > Add/Remove programs and selecting Studio 6.0 and clicking on Repair.  This will run though the installation again an re-register Studio Enterprise 6.0 with Visual Studio 2008.