In Windows NT 3.x, when your password is 14 days from expiration, you receive a Password Change Notification when logging on requesting you to change your password. If the Maximum Password Age is set to 30 days, you receive the notice when your password is only half way through its life span. Although you may wish to change the advance time of the reminder, the Password Change Notification is hard coded at 14 days in Windows NT 3.x and is not configurable.

In Windows NT 4.0, a new registry parameter is available to allow administrators to configure the number of days at which the Password Change Notification is presented. To change this value:

Hive: HKEY_LOCAL_MACHINE
Key: Software\Microsoft\Windows NT\CurrentVersion\Winlogon
Name: PasswordExpiryWarning
Type: REG_DWORD
Value: set # days