My Exch2010 OWA user have recently complained that they are getting no warning that their passwords are about to expire. Any suggestions on how to fix this TIA

Hi In OWA segmentation tab, The option changed password is enable or not? If it is enable and if you it is not prompting, the below discussion give the result of your issue http://social.technet.microsoft.com/Forums/en-GB/exchange2010/thread/f94fe950-bdee-4107-b85c-8f10f3985d07 Also, have a look here http://www.howexchangeworks.com/2010/09/reset-password-in-exchange-2010-sp1.html