My Sharing

1. Log on to the computer as a member of the Domain Admins group.
2. Open Active Directory Users and Computers.
3. Click View, and then click Advanced Features.
4. First, apply permissions on the OU that you want to protect. To do this, right-click the OU that you want to protect, and then click Properties.
5. In OU Properties, click the Security tab, and then click Advanced.
6. On Advanced Security Settings, click Add, type Everyone, and then click OK.
7. In Permission Entry, in Permissions, select the Deny check boxes for Delete and Delete subtree.
8. Select the check box for Apply these permissions to objects and/or containers within this container only.
9. Click OK to close Permission Entry.
10. On Advanced Security Settings, click Apply.
11. Review the Windows Security warning, and then click Yes to continue.
12. Click OK to close the Advanced Security Settings, and then click OK to close OU Properties.
13. Second, apply permissions to the parent container of the OU that you want to protect. To do this, right-click the parent container, and then click Properties.
14. In ContainerProperties, click the Security tab.
15. Click Add, type Everyone, and then click OK.
16. In Permissions for Everyone, select the Deny check box for Delete All Child Objects, and then click Apply.
17. Review the Windows Security warning, and then click Yes to continue.
18. Click OK to close Container Properties.

http://technet.microsoft.com/en-us/library/cc739350%28v=ws.10%29.aspx

1. Log on to the computer as a member of the Domain Admins group.
2. Open Active Directory Users and Computers.
3. Click View, and then click Advanced Features.
4. First, clear permissions on the OU for which you want to remove protection. To do this, right-click the OU, and then click Properties.
5. In OU Properties, click the Security tab, and then click Advanced.
6. In Permission Entries, select the Deny entry for the Everyone group, and then click Remove.
7. Click OK to close the Advanced Security Settings, and then click OK to close OU Properties.
8. Second, clear permissions on the parent container of the OU for which you want to remove protection. To do this, right-click the parent container, and then click Properties.
9. In ContainerProperties, click the Security tab.
10. In Group or user names, select the Everyone group, and then clear the Deny check box for Delete All Child Objects, and then click OK to close Container Properties.

http://technet.microsoft.com/en-us/library/cc736842%28v=ws.10%29.aspx