Message:You do not have sufficient privileges to delete OU, or this object is protected from accidental deletion.
- Open Active Directory Users and Computers.
- Click on View then click on Advanced features.
- Right-click on the OU and select Object ta
- Uncheck the option Protect object from accidental deletion
- Remove the OU.
Remark: If this OU has AD objects under it, you will not be able to remove it if one of the objects is protected against accidental deletion.
Is a very simple solution.