I use a custom MSBUILD XML file to build some of my projects so that I can run stuff to compress CSS/JS files and stuff like that. After installing Visual Studio 2010 and playing around a bit with suddenly my builds started to fail. C:Program Files (x86)MSBuildMicrosoftVisualStudiov10.0WebApplicationsMicrosoft.WebApplication.targets(132,11): error MSB4064: The “Retries” parameter is not supported