http://support.microsoft.com/kb/323750/jahttp://blog.livedoor.jp/mokurin/archives/50404064.html
maxPwdAge = oDomain.Get("maxPwdAge")
numDays = ((maxPwdAge.HighPart * 2 ^ 32) + maxPwdAge.LowPart) / -864000000000@
PasswordLastChanged + numDaysまたは、
user.PasswordExpirationDate