I have two DC's. One of them has Exchange 2003 running on it. I was told when I installed Exchange that installing it on a DC wouldn't be a problem, but I'm finding out now that it can be. Anyways, the problem I am trying to resolve now is why it is telling me that my server is 'Unreachable' when I try to view it's status (under 'Tools' in the System Manager). The admin group that it's displaying is 'First Administrative Group'. Could the error I'm getting in the event logs have something to do with it? The error in the event log is MSExchangeSA, Event ID 9098, the MAD Thread was unable to read its configuration from the DS, error '0x80041010'.