Assume that you create a retention policy for voice mail messages in Microsoft Exchange Server 2010. When you receive a voice mail message that is Information Rights Management (IRM) protected, the retention policy is not applied to the voice mail message.
Note If you remove IRM protection, the retention policy is applied to the voice mail messages.
This issue occurs because a default policy tag (DPT) set with a message class of voice mail only works for messages that have the IPM.Note.Microsoft.Voicemail* message class. However, IRM protected messages have the IPM.Note.rpmsg.Microsoft.Voicemail* message class. Therefore, the retention policy is not applied to the voice mail message that is IRM protected.
To resolve this issue, install Update Rollup 8 for Exchange Server 2010 Service Pack 3.
For more information about the IRM feature, see general information about Information Rights Management.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.