Protect OU (Organizational Unit) in AD from accidental deletion

to verify if your OUs are protected from accidental deletion use:

Get-ADOrganizationalUnit -Filter * -Properties * |Select-Object DistinguishedName, ProtectedFromAccidentalDeletion


to protect all OUs in AD from accidental deletion use:

Get-ADOrganizationalUnit -Filter * | Set-ADObject -ProtectedFromAccidentalDeletion:$true