I am using Team Services on domain visualstudio.com and I need to delete one project, I found out that I need to use command prompt to delete projects, but when I tried the scri
Open “Developer Command Prompt” under “Program Files>Microsoft Visual Studio” or in Windows 8 type “Developer“.
In the command prompt, use this command template below to delete your project from TFS. Replace the YourTFSName to yours and also the ProjectName to the name of your project.
TfsDeleteProject /collection:https://YourTFSName.visualstudio.com/DefaultCollection ProjectName
Hit Enter and then Y if you are prompted for confirmation.
Done. Double check by login to your TFS online.
From http://bizvise.com/2013/03/08/how-to-delete-team-project-from-my-team-foundation-service-tfs-default-collections/