In Exchange 2010, you can use Retention Policies to manage message retention. Retention Policies consist of delete tags, i.e. retention tags with either Delete and Allow Recovery or Permanently Delet...
Updated Dec 13, 2023
Version 3.0
Blog Post
Still waiting on MS to come up with a valid solution for voicemail management too. Many companies don't want voicemails hanging around for more than 14 days after they were listened to. Seems a like a major shortcoming to not be able to purge these reliably.