In Windows 2008 Active Directory Users and Computers Microsoft activated new feature “Protect Container from accidential deletion”
During OU creation you have the ability to mark OU as protected from accidental deletion , and if you try to delete OU you will receive the following error “You do not have sufficient privileges to delete “OU Name” , or this object is protected from accidential deletion”
you dont-have

To unlock OU from accidential deleting protection do the following actions

  • Open Active Directory Users and Computers
  • Go to View
  • Mark with “V”  ” Advanced Features”
  • Right click protected OU
  • Go to  Properties
  • Navigate to “Object” Tab
  • Remove the “V” from “Protect object from accidental deletion “

Protect Ou from accidential deletion