#Add-PSSnapin Microsoft.Exchange.Management.PowerShell.SnapIn
$allfolderlist = Get-PublicFolder -Recurse | where {$_.name -ne "IPM_SUBTREE"}
foreach ($folder in $allfolderlist) {
    $rightslist = Get-PublicFolderClientPermission $folder.Identity | where {$_.user -notlike "svc_quest*" -and $_.user -notlike "exchange services*"}
    foreach ($rightentry in $rightslist) {
        if (($rightentry.user.UserType) -eq "Default" ) {
            write-host "default"
            Remove-PublicFolderClientPermission -Identity $folder.Identity -User "Default" -Confirm:$false
            Add-PublicFolderClientPermission  -Identity $folder.Identity -User "Default" -AccessRight Author

        } elseif ($rightentry.user.UserType -eq "Anonymous") {
            write-host "Anonymous"
            Remove-PublicFolderClientPermission -Identity $folder.Identity -User "Anonymous"  -Confirm:$false
            Add-PublicFolderClientPermission  -Identity $folder.Identity -User "Anonymous" -AccessRight None
        } else {
            write-host "removing:  $($rightentry.user)"
            Remove-PublicFolderClientPermission -Identity $folder.Identity -User $($rightentry.user)  -Confirm:$false
        }

    }
}