Impact of changing group policy

I currently have a group policy that is setup that the passwords have to be 8
characters (but no special characters), rotate every 45 days, and the last
five passwords are remembered. I have one W2k and one Win2003 DC, and will
be changing the policy to the following:

7 Character Minimum
90 day rotation
Remember the last 3 passwords
Need Capital letters, lower case, numbers, and alphanumeric characters
Not contain any part of the username

My question is this: If I have users who have just changed their passwords
and I make a change to the current password GPO, will they be forced to
change their passwords immediately or will they remain under the old password
policy standards until the 45 day limit has run out?

.

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