Force existing accounts to change their passwords

I have just enabled the domain password policy to tighten up security on the network. How can I be sure that all users have changed their passwords? Do I need to change each user account or is their a simpler way of doing his?
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PberConnect With a Mentor Solutions ArchitectCommented:
Load Active Directory Users and Computers.
Click the OU that holds all your users.
Select all users (CTRL-A)
Right click the highlighted user
Click Properties
Select the Account TAB
Select the User must change password at next logon and click Ok.

This will batch modify all users selected.
Bartley1969Author Commented:
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