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When to Reset the Master Password E-mail

There are two distinct situations in which a master password needs to be reset:

The current master password is known, and an administrative user simply wants to reset the password. Changing the master password with this first method is quite easy and will not affect your ability to reset previously enabled FileVault account passwords.
The current master password is lost and a new master password must be created. In this case, if you want the new master password to have the ability to reset FileVault account passwords, you will have to reset all FileVault accounts created with the previous master password. Furthermore, because you're dealing with FileVault accounts that were created with a previous unknown master password, you will have to log into each account individually to reset its FileVault encryption. Thus, you must know all the current FileVault account passwords in order to restore the master password reset ability for all accounts. Remember, if both the master password and a user's FileVault password are lost, then that user's home folder contents are lost forever. Excerpted from Apple Training Series: Mac OS X Support Essentials v10.6: A Guide to Supporting and Troubleshooting Mac OS X v10.6 Snow Leopard by Kevin M. White
 
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