If a Visual Studio solution originally contains either an InstallShield 2011 or InstallShield 2012 project and the InstallShield project is upgraded to InstallShield 2012 Spring, the following error may be encountered when building using Team Foundation Server (TFS):
"TestProject.isproj (51): The imported project "C:\Program Files (x86)\MSBuild\InstallShield\2011\InstallShield.targets" was not found. Confirm that the path in the <Import> declaration is correct, and that the file exists on disk."