How to unlock a file from someone else in Team Foundation Server

Question

We have a project that is stored within our TFS server and some files were Checked-Out by me from another computer and another user (both of which are not used anymore). Is

Answer 1

2019 answer, as most of the above is depracated.

tf undo /workspace:"hostname;username" "$/path/*" /s:https://yourhostname/tfs in an elevated command prompt, from a path such as C:\Program Files (x86)\Microsoft Visual Studio 14.0\Common7\IDE>