I've recently noticed the following Error in my Server logs. Happens whenever Mobile device user attempts to syncrhonise using OMA. The error is logged on the server, but the user is able to sync, albeit slowly.
Event Type: Error
Event Source: Server ActiveSync
Event Category: None
Event ID: 3005
Date: 16/03/2010
Time: 01:22:20 PM
User: xxxxxx
Computer: xxxxxx
Description:
Unexpected Exchange mailbox Server error: Server: xxxxxx
User: xxxxxx HTTP status code: [409]. Verify that the Exchange
mailbox Server is working correctly.