Hello, I am full time employed SQL Server/MS Access developer specialized in working with data. I never had a chance to work with such a large file but my vim text editor could handle that as it says in its specification.I can guarantee you confidentiality when it comes to your data because it contains e-mail addresses so no problem with me signing non-disclosure agreement or something else. Rest of the task is fairly simple so feel free to contact me if you want me to do the task. Best Regards, Neno