LastLogonDate can be up to two weeks stale. This PowerShell script queries the non-replicated LastLogon attribute on every domain controller directly and returns the real answer.
A PowerShell script to list every user in a specific Active Directory OU, including sub-OUs by default, before applying a GPO or handing the OU off to a delegated admin.
A PowerShell script to list deleted Active Directory user accounts still sitting in the AD Recycle Bin — plus how to check whether the Recycle Bin is even enabled, and how to actually restore what you find.