From Windows 2008 Domain Controller Security Technical Implementation Guide
Part of Maximum Password Age
Associated with IA controls: IAIA-2, IAIA-1
The longer a password is in use, the greater the opportunity for someone to gain unauthorized knowledge of the passwords. Further, scheduled changing of passwords hinders the ability of unauthorized system users to crack passwords and gain access to a system.
Configure the Maximum Password Age so that it is not "0" and doesn't exceed 60 days.
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