ADUC Missing the unlock account option

Hi,

Environment:

Domain Functional Level: WS2003
Forest Functional Level: WS2003
Two DCs: Running WS2003

When view ADUC from Domain Controller server - WS2003, noticed that it display (Account is locked out) for all user accounts.

When try to reset a user password, the Account Lockout Status message is not showing up & unable to unlock account:

However, when installed the ADUC tool in WS2008, the Account Lockout Status message is there and get the unlock account option:

Why unable to unlock user account from the DC (WS2003) itself?

There is no more release WSUS patches for WS2003.
If this is patches related issue, which update(s) is missing? 

Thanks