Exchange 2007: Berechtigungen auslesen per Powershell

function get-permissions {
$AllUsers = @()
$mailboxes = @()
 
$name=read-host "Please enter the Logonname"
$AllUsers += Get-Mailbox -Resultsize Unlimited
 
foreach ($user in $AllUsers)
{
                $perm = Get-Mailboxpermission -Identity $user
 
                foreach ($permission in $perm)
                {
                               if ($permission.user.tostring() -like "*$name*") {
                                               $obj = new-object psObject
                                               $obj |Add-Member -MemberType noteproperty -Name "Mailbox" -Value $user.Displayname
                                               if ($permission.Accessrights[0] -like "*fullaccess*") {
                                                               $obj |Add-Member -MemberType noteproperty -Name "Vollzugriff" -Value "True"
                                               } Else {
                                                               $obj |Add-Member -MemberType noteproperty -Name "Vollzugriff" -Value "False"
                                                               }
                                               if ($permission.Accessrights[0] -like "*SendAs") {
                                                               $obj |Add-Member -MemberType noteproperty -Name "Senden Als" -Value "True"
                                               } Else {
                                                               $obj |Add-Member -MemberType noteproperty -Name "Senden Als" -Value "False"
                                                               }
                               $mailboxes += $obj
                               }
                }
}
$mailboxes
$filename = $name.Replace(".","-")
$mailboxes | export-csv c:\$filename.txt -NoTypeInformation -encoding default
}