Check your Commserver\UnityMTA folder and see if you have messages in there. Also check the failed folder as well. If you see messages in this folder then Unity is having an issue connecting to the mailstore. The connectivity issue could be anything from security permissions to name resolution.
What mail system are you using. If you are using Domino then UMR mode is disabled by default, I believe. When UMR is disabled I believe it goes to the failsafe conversation you are hearing.
Just to clarify you are also not seeing messages in the UnityMTA as well, correct? Reason asking because failed messages (corrupt, etc.) go to the failed folder and normal messages are stored in the UnityMTA root. Each message has a wav file and a text file.
Ok so assuming nothing in the MTA. Can you provide some more information about what you can do? Is it just one user or all? Can you access Unity via the opening greeting or something like greeting administrator? Mainly we need to know where to look next and determine if it's a Unity issue or one of it's layered products.
Lastly run a dbwalker and post the report or let us know what errors (if any) appear.
I also found another thread you might want to review.
Check to make sure your Exchange Store is mounted and running. If you ran out of disk space on the Exchange store, it will dismount, causing Unity to give you this message. Unity can probably take messages fine, but when you go to listen to them, you will get this message because it can not get to the Exchange store.
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