I have a 3rd party system used for phones/voicemail. When people call a user, the user gets an email w/ wav file attached delivered to their mailbox. Management would like to retain all voice mail in each user's mailbox for 60 days. I need a way to prevent users from deleting those voicemails. Also, I don't want to enable all users for legal hold to accomplish this. If it matters, the message class for these emails is IPM.Note.I3Vox
Not sure it matters but I am migrating to Exchange 2013 within a month or so consequently any solution would need to be available in 2013 also.