Usernames in Active Directory (AD) are generally not case-sensitive — but sometimes, you may want them standardized for consistency, integration requirements, or policy enforcement.

In one real-world scenario, a customer wanted all AD usernames (sAMAccountName) to be lowercase across a specific Organizational Unit (OU). Here’s a simple example of how you can accomplish this using PowerShell.

$InformationPreference = ‘Continue’

$users = Get-ADUser -Filter * -SearchBase “OU=MSHELDON,DC=T4EDEV,DC=local”

foreach($user in $users) {

    try {

            $user | Set-ADUser -Replace @{ sAMAccountName = $user.SamAccountName.ToLower() }

            Write-Information “Updated user [$($user.SamAccountName)]”

    } catch {

        Write-Warning “Failed to update user [$($user.SamAccountName)]”

    }

}