![Why doesn't SQL Server allow me to enable the mixed authentication mode so I can use the sa user to assign roles to the other users? - Stack Overflow Why doesn't SQL Server allow me to enable the mixed authentication mode so I can use the sa user to assign roles to the other users? - Stack Overflow](https://i.stack.imgur.com/VtyJX.png)
Why doesn't SQL Server allow me to enable the mixed authentication mode so I can use the sa user to assign roles to the other users? - Stack Overflow
![SQL Server Authentication Modes: Back To Basics - TechNet Articles - United States (English) - TechNet Wiki SQL Server Authentication Modes: Back To Basics - TechNet Articles - United States (English) - TechNet Wiki](http://social.technet.microsoft.com/wiki/cfs-file.ashx/__key/communityserver-wikis-components-files/00-00-00-00-05/68108.3.jpg)
SQL Server Authentication Modes: Back To Basics - TechNet Articles - United States (English) - TechNet Wiki
![SQL Server Authentication Modes: Back To Basics - TechNet Articles - United States (English) - TechNet Wiki SQL Server Authentication Modes: Back To Basics - TechNet Articles - United States (English) - TechNet Wiki](http://social.technet.microsoft.com/wiki/cfs-file.ashx/__key/communityserver-wikis-components-files/00-00-00-00-05/1266106.1.jpg)
SQL Server Authentication Modes: Back To Basics - TechNet Articles - United States (English) - TechNet Wiki
![sql server - Cannot log in using SA with SQL Authentication - Database Administrators Stack Exchange sql server - Cannot log in using SA with SQL Authentication - Database Administrators Stack Exchange](https://i.stack.imgur.com/McncJ.png)