In SQL Server Management Studio Object Explorer, right-click the server, and then click Properties. On the Security page, under Server authentication, select the new server authentication mode, and then click OK. In the SQL Server Management Studio dialog box, click OK, to acknowledge the need to restart SQL Server. Make sure you restart the server. and remember "If Windows Authentication mode is selected during installation, the sa login is disabled. If you later change authentication mode to SQL Server and Windows Authentication mode, the sa login remains disabled. To enable the sa login, use the ALTER LOGIN statement." Cheers Ghazi
/* Ghazi Hadi Al Wadi, PMP, ASQ SSGB, DBA */