Oracle Database Discussions

Hi,
We are working on 11gr2 and having a customer which is Insisting we must drop schemas that are not in use.
I got the following users that are locked and expired:

USERNAME ACCOUNT_STATUS
------------------------------ --------------------------------
CTXSYS EXPIRED & LOCKED
MDSYS EXPIRED & LOCKED
ORDSYS EXPIRED & LOCKED
EXFSYS EXPIRED & LOCKED
DBSNMP EXPIRED & LOCKED
WMSYS EXPIRED & LOCKED
ORACLE_OCM EXPIRED & LOCKED
OLAPSYS EXPIRED & LOCKED
SI_INFORMTN_SCHEMA EXPIRED & LOCKED
MGMT_VIEW EXPIRED & LOCKED
OWBSYS EXPIRED & LOCKED
ORDPLUGINS EXPIRED & LOCKED
SPATIAL_WFS_ADMIN_USR EXPIRED & LOCKED
SPATIAL_CSW_ADMIN_USR EXPIRED & LOCKED
SYSMAN EXPIRED & LOCKED
APEX_PUBLIC_USER EXPIRED & LOCKED
DIP EXPIRED & LOCKED
OUTLN EXPIRED & LOCKED
ANONYMOUS EXPIRED & LOCKED
FLOWS_FILES EXPIRED & LOCKED
ORDDATA EXPIRED & LOCKED
MDDATA EXPIRED & LOCKED
OWBSYS_AUDIT EXPIRED & LOCKED
APEX_030200 EXPIRED & LOCKED
APPQOSSYS EXPIRED & LOCKED

Which schemas can I drop? planning to drop with all objects (cascade).
I know it's not recommended to do so... but when the customer demands... :)

Thanks for any help!