What do you do if the file in TFS is locked by someone else?

For the following operation, you will need to be either a project administrator for the project you want to undo the check-in on or a Team Foundation Administrator if you want to do this across all projects.

If you still have the username of the person, you can simply do something like this:

• Open up Visual Studio command prompt (Start -> Programs -> Microsoft Visual Studio 200X -> Visual Studio Tools -> Visual Studio 200X Command Prompt)
• Run the following command:

tf lock /lock:none /workspace:WorkspaceName;USERNAME /recursive $/

To get the list of workspaces for a user, just run the following command from the same prompt:

tf workspaces /owner:username

For more commands, check tf /?

If the developer has left the organization, then the best thing to do is to delete their workspaces. This will unlock the files for you but also free up some resources on the server.

See the following blog post I did on the topic when it happened to me a few years ago.

http://www.woodwardweb.com/vsts/unlocking_files.html

You can either delete the workspace using the command line (tf.exe) or you can use the excellent TFS Sidekicks from Attrice.