Handy Powershell
Export details of users in a specific OU:
$OUpath = '<place OU path here distinguished name of ou in attribute editor>'
$ExportPath = '<place where to put output>'
Get-ADUser -Filter * -SearchBase $OUpath | Select-object DistinguishedName,Name,UserPrincipalName,sAMAccountName | Export-Csv -NoType $ExportPath