Can anyone tell me how to revert (roll back) a checkin in TFS 2010?
You can rollback a changeset (in TFS2010) through command line doing:
C:\Program Files (x86)\Microsoft Visual Studio 10.0\Common7\IDE\tf.exe" rollback /changeset:123 /recursiveNote: you must use tf.exe full path even in Visual Studio Command Prompt to avoid "Unable to determine the workspace" error. More info here
Rollback reference (TFS 2010)
https://msdn.microsoft.com/en-us/library/dd380776(v=vs.100).aspx