I have a excel 2007 spreadsheet that I'm sharing with some of my coworkers while we work on a project. Recently, when I try to save the file, I get this error: "This file is locked. Try the command again later." I figured this was happening because one of my coworkers was doing something weird so I was being locked out. So I copied the file and opened the copy, tried to save it again and got the same error!
What have I done to my spreadsheet and how do I fix this?