Regarding Gandolf's post, in Exchange 2007 there are now different *types* of messages, voicemail and email. The Journaling feature is aware of this: it won't journal voicemail by default. However, the Transport rules are not aware of this difference, there isn't an explicit "voicemail" checkbox in the Transport rules. Therefore, the transport rule needs to key in on some other attribute of the message, like subject name or attachment file name (or both). So Gandolf is correct, if the user changed the file extension and subject, he could bypass the transport rule. Perhaps I could write a more complex transport rule that keyed off information less accessible to the user, but ultimately the end user will probably win this "arms race." They can play the message on a speakerphone and record it, just as users can use cellphone cameras to take pictures of rights-managed documents. We've raised the bar high enough to prevent "accidental" forwarding of voicemail outside the organization, but a motivated and intentional user can get a voicemail outside the system if they try hard enough.
Microsoft
