What I am looking for is a powershell script or help with one that I can run and expire a group of people from a csv file. So for example
People with the surname beginning with A to E then F to I and so on......
I would populate the spreasheet but just need to expire people passwords in groups rather than expiring everyone in one hit. The reason i am wanting this I am implementing a new password policy and as we have over 2500 users I would rather expire them and have them change the password on next login in chunks on a weekely basis.