windows password expiration

We have discovered that one of admins in a child domain turned off the password expiration interval for that domain.  It was turned off back in November.  My question is if I go set it back to 90 days does everyone's counter start 90 days from me turning the setting back on, or am I expecting that most people will now be in a position that there password now needs to be changed now or very shortly.  Just want to know what to expect.
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oBdAConnect With a Mentor Commented:
The password expiration date is calculated dynamically based on the date when the password was changed last.
In other words: the date of a policy change has absolutely no influence on when the user has to change his password next, so people will have to change their passwords pretty soon (if not immediately) if you set the expiration date back to 90 days.
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