Force Password change

use group policy to set the maximum password age to what ever value you need such as 14 days if using local security settings, click start, programs, administerative tools local security (for the local machine only)settings,expand the account policies node, open the password policies node and right click maximum password age and set this to the value that you require or if in a domain environment set the group policy at the domain level set the group poliy to "no override" and set the maximum password age using computer settings, expand the account policies node, open password policy node and set the maximum password age to the value that you require.

On NT4 Domain, as I know you can use Account Policies to change Password expires date. You can set that to 1 day then all users will need to change their password in the next 24 hours. Don't forget to change the settings back to 30 days or less if you don't want your users to change their password everyday. There's no option to select a certain time but that could be a solution to your situation.

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