I can't believe I forgot to mention this before, but there's an extremely cool new feature in Exchange 2010's unified messaging engine. Exchange 2007 supported three different audio codecs for UM: WMA, GSM 06.10, and GSM G.711. You could pick a codec for individual users, but that wasn't a great solution for non-Windows Mobile devices.
Exchange 2010 changes this support; it now comes with MP3 support, and MP3 is the default codec used for voice messages. This greatly improves the experience of working with voice messages by making them easier to open and manage. Try it, you'll like it!
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