In an Exchange 2000 environment Unity is checking is see if the Store is available using RPC. If that fails for some reason (several possibilities here) Unity will believe that the Exchange servers is down and proceed to UMR mode.
Unity uses the same method used by the Service Control Manager to connect to a remote server. You might try testing that when Unity believes the server is down.
Changing HKEY_LOCAL_MACHINE\SOFTWARE\Active Voice\AvWm\1.00\Diag Level to 1 will output more data in some instances when Exchange goes offline. No reboot is required.
Can you set that and post the event logs the next time it happens?
I'm not sure I understand here - the original problem was that you were getting events in the application event log related to Unity indicating Exchange servers were going on/off line. Fiddling with the Event Notification Utility couldn't have any affect on that.
The ENU doesn't add messages to the event log - it simply "watches" the events being logged and will trigger a notificaiton if one you've requested come by - it wouldn't add any of these events you noted into the log itself.
Unless I'm misunderstanding the original problem description?
I am sorry for not making my original problem clear.
The original problem was that we were getting email notifications to the Example Administrator with the error that the Exchange server is unavailable. We didnt get any errors in the Application event log.
Now I understand how ENU works. My guess as to what created this problem is, may be, at some point when Exchange went offline, ENU watched that event and it got stuck in a loop and kept on notifying Example Administrator of that state. Once we deactivated and again activated that event, may be it refreshed and now it is working fine.
I'm interested since my group is currently redesigning the error notification utility from the ground up and I'm watching for issues in the current implmentation closely - just wanted to make sure I understood this one.
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