SQL Server 2008 R2 Setup. Mixed authentication mode is mandatory.
We require mixed mode for the install.
During setup, you must select an authentication mode for the Database Engine. There are two possible modes:
Windows Authentication mode and mixed mode. Windows Authentication mode enables Windows Authentication and disables SQL Server Authentication.
Mixed mode enables both Windows Authentication and SQL Server Authentication. Windows Authentication is always available and cannot be disabled.
Mixed Mode Authentication during setup, you must provide and then confirm a strong password for the built-in SQL Server system administrator account named sa. The sa account connects by using SQL Server Authentication. We require ‘sa’ or ‘administrator’ rights to create the mdb.