Make sure the Alerter service is started.
<b>The best and most reliable solution is to use a 3rd party software solution that proactively notifies users of upcoming password expiration.</b>
The best software tool that I have found is Password Reminder PRO from <a href=”http://www.sysoptools.com”>SysOp Tools</a>
It’s low cost, easy to setup / deploy and can be used free for 60 days. It also allows you to test in your live domain without disturbing users. Highly recommended, definitely makes up for the noted issue.