there was a known error with the RealSpeak TTS engine a while back that if you logged into the desktop and while logged in a call came in that used TTS resoruces, if you logged out it would kill the TTS engine which, in turn, pulled Unity down with it. An updated TTS engine from the RealSpeak folks fixed this issue.
Which build of Unity 2.x are you on? Are you using RealSpeak? If so, you can download the new RealSpeak TTS engine that fixes this off CCO at:
I'm not able to access my old voice mail messages all of a sudden. The recording says something like 'the message is currently not available'. This has never happened before in all the years I have been using this system. I have t...