OWA 2013 - password reset prompt

In previous versions of OWA you could set a flag to allow users to change their password through OWA if the had the "user must change password at next logon" flag checked for their AD object.

I can't find any guide or article about this feature for OWA 2013.

I've also seen that OWA 2013 seems to require UPN logon when changing the password?

http://social.technet.microsoft.com/Forums/exchange/en-US/c26f80be-921c-44eb-a875-babe2022471b/change-password-in-owa-with-upn

Our AD FQDN is :

"ad.contoso.org"

Users' email address are jsmith@contoso.org

So when they login through OWA they use their email of jsmith@contoso.org

But I'm not sure if the above mentioned UPN problem with OWA 2013 will affect our users or not.

I can't ask my users to input their login information in OWA as jsmith@ad.contoso.org as that will cause too much confusion. I also can't ask them to input AD\jsmith as that will just generate hundreds of helpdesk calls when people forget to put AD\ in front of their username.