Apply new permissions to all existing active directory user objects

I granted a service account R/W permissions on a attribute to the user class. All newly created users have the service account added to the security tab of the user object, and I can see that the service account R/W permissions to the attribute. However, all the existing users do not have the permission set. How do I give a service account R/W permissions to a specific attribute for all existing users?
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MightySWConnect With a Mentor Commented:
Go to ADUC and right click on the OU that you want to alter and select delegate control.

Follow the steps

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