I think it is a bug. In the older versions of Outlook there was a prompt -
"your password expired" and a form to change it. So MS just forgot to bring
that functionality to Outlook 2003 (with rpc over HTTP). Imagine we have
hundreds of users on rpc over HTTP profiles, and every 42-nd day each one of
them cannot get to Outlook and it does not even give a reason. They have to
know that it is the expiration, go to the Outlook-Web-Access and change their
passwords there, then can go to Outlook 2003.

My question to any dear MVP reading this reply - how do we upgrade it from
"feature requested" to "a bug to be fixed soon"????

"Marcel" wrote:

When using outlook with exchange in rpc over http(s) mode, the rpompt for a
password does not detect when a password is expired and needs to be changed.
The prompt for the password re-appears as if a wrong one has been entered.
Outlook should detect expired passwords and provide an option to change them.