Our 2008 builds are failing after installing Visual Studio 2010. First DeleteWorkspaceTask is not able to delete existing workspaces. Then after manually deleting and re-running, we ran into some other pre-reported issues, e.g. GenCheckinNotesUpdateWorkItems fails because AssociatedChangesets parameter is not supported. Why would a 2010 studio (not even build) install step on the 2008 build mechanism? Our work-around right now is to install 2010 build items on a box that doesn't have 2008 team build.