Have you enforced your Domain Policy?
Is the policy in question linked to the domain or OU. (You may need to link it at the domain level otherwise it will only apply to local accounts)
Is the computer by any chance in the default "Computers" OU.
Run "gpupdate /force"
The default domain policy is where the settings have been applied, but it is not enforced. However, the policy itself works, because users have been having to change their passwords every 90 days for several months now -- it's just that I'm not seeing the notifications
in Windows 7 in particular. I don't believe blocking of policy inheritance is activated anywhere. The policy is linked at the domain level and the computers are all in a manually created OU -- not the default.
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