Note: The information in this article applies to Team Foundation Server 2010.
TF200040: You cannot delete a team project with your version of Team
Explorer. Contact your system administrator to determine how to upgrade
your Team Explorer client to the version compatible with Team
In order to remove a Team Project, you must have a compatible version of
the TFSDeleteProject executable available on your system. Please review
the "Delete a Team Project
" article for more information.