Strip attachments from previously archived items

Hi,

we have recently changed the "Strip attachments to non-shorcut items" setting from Off to On, as we found users who were exceeding their quota only with meeting requests and responses with attached files.The problem is that we have realized that the attached files in the previously archived items are not being removed, so we are not resolving our problem. I'm not sure if we are not being able to apply the Exchange Mailbox Policy correctly or if it's just not possible.

We use EV10.0 in a Windows Server 2008R2.

Thanks.

Javi.