will password policy change in AD force users to update on next login?

On active directory 2003, I will make a password length longer and enable complexity.  

Question: As soon as I do this, will users immediately have to change passwords or will AD wait until the scheduled expiration / password age expires? I have no desire to have 300 people all call me at the same time.
icecom4Asked:
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CorinTackNetwork EngineerCommented:
If all you do is change the requirements for complexity, the users will continue using their existing passwords until the next date they are supposed to change.

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Will SzymkowskiSenior Solution ArchitectCommented:
Question: As soon as I do this, will users immediately have to change passwords or will AD wait until the scheduled expiration / password age expires?

If you make thing change users will still be able to use the same password until it expires or they want to change it manually. At that time will the new password policy kick in.

Will.
icecom4Author Commented:
Would you be able to point me to any other info suggesting this is true?
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CorinTackNetwork EngineerCommented:
icecom4Author Commented:
is this also true if the maximum password age is NOT DEFINED ?
CorinTackNetwork EngineerCommented:
Yeah, in that case the settings would only take effect when the user chose to manually change their password, as it wouldn't expire.
Will SzymkowskiSenior Solution ArchitectCommented:
is this also true if the maximum password age is NOT DEFINED ?
Any password policies that you change and put into affect will only take affect on the users the next time the password expires.

You can also reference the link below to confirm that Maximum Password Age does not reset the users password age respectively. It is only when the user passwords expires. Look under the Summary in the link.

https://support.microsoft.com/en-us/kb/236373

Will.
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