How can I force all domain users to change their password now? I want to do so before users next logon.
Use a combination of
This would change password of all users in Sales in New York to "ChangeThisNow!" and force them to change it on login.
Here's a reference on
If you are using PowerShell, this command will force all users in the current domain to choose a new password next time they log in.
If you want to be more precise about which users are affected, you can narrow it down to an organizational unit.
More options can be found here: Migrated Users Get Prompted To Change Password at First Logon (blogs.technet.com).