I believe the last login/logout date should be added to the Inactive User report to help determine whether or not the users can be deleted or researched further based on the amount of time since last login.
It would also be useful to have Date User Account Created so that you can filter out newly created user accounts who have not had the opportunity to log in yet.
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It would also be useful to have Date User Account Created so that you can filter out newly created user accounts who have not had the opportunity to log in yet.