Existing SQL Agent user proxy accounts will be upgraded to a single new proxy called UpgradedProxyAccount. By default, all ...

Existing SQL Agent user proxy accounts will be upgraded to a single new proxy called UpgradedProxyAccount. By default, all existing owners of SQL Server Agent jobs have access to this new proxy account, which can access all subsystems except those that are new in SQL Server 2008. You can later create more granular permissions by defining multiple proxies.