$LDAPstring = "LDAP://domainname/OU=OU1,DC=timken,DC=com"
enumerates everything in the OU1 OU

$LDAPstring = "LDAP://domainname/OU=OU2,OU=OU1,DC=timken,DC=com"
enumerates everything in the OU2 OU.

should be right.
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