I need to know if Exchange 2013 SP1 (15.0.847.32) supports password resets via the users UPN when a user's password has expired when they log in to OWA. This was a feature that was added to Exchange 2010 SP1 in rollup 3 (http://support.microsoft.com/kb/2464564). I'm able to login to OWA with their UPN but upon being presented with the password reset screen the user has to use DOMAIN\Username rather than their UPN (email address).
Without this feature I can't see how hosting providers can simplify the users experience when they are resetting their passwords. I would prefer not for the user to have to remember their AD logon name, I just want my users to have to remember their email address.