ELM-ADTools

1.3.38

public/Change-UPN.ps1

                                function Change-UPN {

    [cmdletbinding(SupportsShouldProcess=$True)]

    param (

        [string]

        [Parameter(Mandatory=$true)]

        $OldSuffix,

        [string]

        [Parameter(Mandatory=$true)]

        $NewSuffix

    )

    Import-Module ActiveDirectory

    $OU = Choose-ADOrganizationalUnit -HideNewOUFeature | Select-Object DistinguishedName -ExpandProperty DistinguishedName

    $Users = Get-ADUser -Filter * -SearchBase $OU

    foreach ($U in $Users) {

        $NewUPN = $U.UserPrincipalName.Replace($OldSuffix,$NewSuffix)

        Set-ADUser -Identity $U.SamAccountName -UserPrincipalName $NewUPN

       }

}