This will only work if the SQL Server was stopped when you copied the MDF file from the old SQL Server. If you copied the file while the SQL Server was running this file probably will not attach either and you will need to get a valid backup of the database. Download help tool for sql database - SQL Server Restore Toolbox. http://www.sqlserver.restoretools.com/[/url] You can read up more on SQL Server here. http://www.filerepairforum.com/forum/microsoft/microsoft-aa/sql-server/498-creating-a-new-database-using-an-mdf-file?_=1416149856104