$o = New-Object -comobject outlook.application
$n = $o.GetNamespace(“MAPI”)

$Account = $n.Folders | ? { $_.Name -eq 'user@szotkowski.info' };

$Inbox = $Account.Folders | ? { $_.Name -match 'Inbox' };

$TargetFolder = $Inbox.Folders.Item('!TEST')

$Inbox.Items | ForEach-Object -Process {$psitem.Move($TargetFolder)}