During installation of SQL Server 2008, the following three local groups are automatically created where SQLEXPRESS
is the instance name.
SQLServer2005SQLBrowserUser$<computer name>
SQLServerMSSQLServerADHelperUser$<computer name>
SQLServerMSSQLUser$<computer name>$SQLEXPRESS
SQLServerSQLAgentUser$<computer name> $SQLEXPRESS
However with SQL Server 2012, the last three are missing.
Why did they decide to stop using the local Windows groups? Why does SQL Server 2012 not use local groups anymore?