With Exchange Server 2010 Web Apps ( used to be OWA) users can now change their password without calling the helpdesk or using their PC.
This feature can save time to the users and the IT depertment.
There are two ways to access the change password in OWA, One is by clicking on the message to change the password when you access OWA when your password is due to expire in 14 days.
The second way is by accessing the Setting menu.
First method you just click on Yes when you see the change password option when you open OWA
Once you click yes you will see the Change Password page where you will enter a new password.
Option 2 is to go to Options menu in the Right top corner and click on See All Options
Click on Settings
Click on Password on the top menu and just type a new password.