AD (Active Directory) Password Change Web Part allows the users to change their own passwords in a SharePoint portal site without site administrator intervention. When a user accesses a page where the AD Password Change Web Part is configured (refer next section to configure), the Web Part automatically detects the users' user name and domain and displays it in the Username field. The user then enters their old password, the new password and a confirmation of the new password and then clicks Submit. If the current password is incorrect or the new password does not meet the password policy criteria in place at your site, the user receives an error message. The Web Part verifies the new password and then submits the change and displays the message.
||Microsoft SharePoint Foundation 2010