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
Although the accepted answer is absolutely correct and very clear, I managed to get lost and run into that 'grayed out Delete button' issue and just wanted to share what I was doing wrong.
For the folks having issue with grayed out delete button, make sure that you are inside 'View the collection administration page' (as shown in the accepted answer), not inside the project itself.
If the last breadcrumb on the top of your VS Team Services is the name of the project, you are at the wrong place (it looks similar). Here the Delete button (appears on right clicking the project name) will be grayed out.
If you click the link that says 'View the collection administration page' after clicking the Settings(gear), you will be at the right place.