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Been searching all night for this... does anyone know the registry key for Windows XP/2003 to enforce password history? http://www.microsoft.com/resources/documentation/windows/xp/all/proddocs/en-us/500.mspx?mfr=true

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What do you mean by "password history" exactly? –  Mehrdad Oct 1 '12 at 2:22
    
Determines the number of unique new passwords that have to be associated with a user account before an old password can be reused. microsoft.com/resources/documentation/windows/xp/all/proddocs/… –  Fran Fitzpatrick Oct 1 '12 at 2:23
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There is no "password history" registry key. If there was, it would be a major security hole. @Fran: That's password policy, not password history. –  Ken White Oct 1 '12 at 2:24
    
How would it be a major security hole? Every other password policy option is linked to a registry key. –  Fran Fitzpatrick Oct 1 '12 at 2:25
    
It is a password policy to enforce password history. Ah, lets just chalk it up to semantics. :-) Anyone know? –  Fran Fitzpatrick Oct 1 '12 at 2:26
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2 Answers 2

HKLM\SYSTEM\CurrentControlSet\Services\Netlogon\Parameters 

Value to check: RefusePasswordChange and MaximumPasswordAge

[Source: MS Technet Librairy]

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I don't know about Windows XP/2003, but on Windows 7 Ultimate x64 it's apparently

Key:         HKLM\SAM\SAM\Domains\Account
Value:       F
Byte offset: 0x10   (0x3A corresponds to 0, 0x3B corresponds to 1)

It's in binary, maintained by LSASS, so I don't recommend you try to change it through undocumented means.

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