Professional Edition Only
Specifies that the password for the encrypted volume is to expire every NNN days. Valid values are from 1 to 999 days. For example, a volume with this option set to 1 would require that the password be changed the first time it is opened each day. A setting of 30 would require password changes once a month.
Once a password has expired, users will be required to change the password before being allowed to open the respective volume to a drive letter. The only exception to this rule is when a grace period is allowed. See /GRACE option.