Update UPN for AD accounts in a specific OU recursive

# Update UPN for AD accounts in a specific OU recursive

Import-Module ActiveDirectory
$oldSuffix = "anonit.local"
$newSuffix = "anonit.net"
$ou = "OU=UsersOU,DC=anonit,DC=local"
$server = "anonit-dc-01"
Get-ADUser -SearchBase $ou -filter * | ForEach-Object {
    $newUpn = $_.UserPrincipalName.Replace($oldSuffix,$newSuffix)
    $_ | Set-ADUser -server $server -UserPrincipalName $newUpn
}