I checked out this post and does this sound right:
Expected behavior is that if you listen to your vmail through Notes, it will not change the MWI. But if you delete the VM through Notes, it will turn the MWI off.
We are seeing this now in the lab. But is this expected and is there anything else we can do change the "read" and "unread" state in Notes. I know how to control it in Exchange, but Notes Im a little fuzzy on.