UpdateImmutableID
To update one or more userser
$usersTable = New-Object system.Data.DataTable “UsersTable” $column1 = New-Object System.Data.DataColumn userPrincipalName, ([String]) $column2 = New-Object System.Data.DataColumn immutableId, ([String]) $usersTable.Columns.Add($column1) $usersTable.Columns.Add($column2) $users=Import-Csv -Path users.csv -Header “userSamAccountName” foreach($user in $users) { $adUser = Get-ADUser -Identity $user.userSamAccountName $adUserGuid = $adUser.ObjectGUID $byteArray = $adUserGuid.ToByteArray() $immutableId = “” $immutableId = [system.convert]::ToBase64String($byteArray) $row = $usersTable.NewRow() $row.userPrincipalName = $adUser.userPrincipalName $row.immutableId = $immutableId $usersTable.Rows.Add($row) } $usersTable | Export-Csv “c:\Users\Inlogic\UserExportIds.csv”