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I do not have install privileges on my machine.

Another user who has admin privileges installed it, but told the system to use Windows Authentication for the sign on.

Is there a way they can change the User Instances from one Windows Authentication to another without having to reinstall?

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1 Answer 1

up vote 4 down vote accepted

Yes. Someone who has administrative rights (aka admin rights) to the SQL instance can change this by using SQL Server Management Studio.

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