Setting "user must change Password at next logon" not working.

Tech-Archive recommends: Repair Windows Errors & Optimize Windows Performance

I have Windows Server 2003 running PDC. Client computers are running
Win XP SP2.
I would like to enforce a password change for one user only. I will be
configuring a Group Policy eventually to enforce Password history
policy in the future, but for the time being, I only need to change one
password.

I reset this user's password to XXXX and checked "User Must change
password at Next Logon" through ADUC, right clicked on user name, reset
passord. In the user properties, there is a checkmarch next to "User
Must Change Password at next login", no other checkmark.
The user has restarted PC a few times, logged on and off a few time,
but that rule is still not being applied. User can still use the XXXX
password and no password change prompt comes up.

Is there something missing? Do I have to change the expiration date for
password?

Thanks in advance.

Al

.