To change your password, Exchange 2007 provides you the option to use Outlook Web Access (OWA) to make the changes. To get there, open any internet browser (for full user experience please use IE Explorer 6+) and type in the address bar : https://xmail.exchange.datagate.net

Login using your email address and current password.  

Once you are logged in, on the left side click the Options button.

 

 

 

Next, scroll down and click Change Password.

You will now be prompted to enter your former password as well as the new password, press the Save button to confirm your changes.

Outlook Web Access will tell you that your password has been successfully changed. 

Press the OK button to log in with your new password.