I installed mobileadmin this weekend on the active node of my a/p cluster. I set the ip to all unassigned before installed and then changed back to my vIP. Has anyone else seen this? It is also accompanied with this in the event log. Event Type: Error Event Source: Server ActiveSync Event Category: None Event ID: 3005 Date: 3/5/2007 Time: 8:33:19 AM User: <Domain>\<username> Computer: <Active Cluster Node> Description: Unexpected Exchange mailbox Server error: Server: [<Active Cluster Node>.<Domain>.com] User: [<username>@<domain>.com] HTTP status code: [400]. Verify that the Exchange mailbox Server is working correctly.