Abstract: During troubleshooting you found the event Error 1006 (The Microsoft Exchange Mailbox Replication service was unable to process jobs in a mailbox database) on your Exchange environment and wish to solve that.
Full error message:
Log Name: Application Source: MSExchange Mailbox Replication Date: 2016-10-04 09:06:31 Event ID: 1006 Task Category: Service Level: Warning Keywords: Classic User: N/A Computer: exch01.int.contoso.com Description: The Microsoft Exchange Mailbox Replication service was unable to process jobs in a mailbox database. Database: Missing database (df16301a-89a5-4bce-bada-733a70c2ef90) Error: Database 'df16301a-89a5-4bce-bada-733a70c2ef90' doesn't exist. Event Xml: <Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event"> <System> <Provider Name="MSExchange Mailbox Replication" /> <EventID Qualifiers="32772">1006</EventID> <Level>3</Level> <Task>1</Task> <Keywords>0x80000000000000</Keywords> <TimeCreated SystemTime="2016-10-04T07:06:31.000000000Z" /> <EventRecordID>4004119</EventRecordID> <Channel>Application</Channel> <Computer>exch01.int.contoso.com</Computer> <Security /> </System> <EventData> <Data>Missing database (df16301a-89a5-4bce-bada-733a70c2ef90)</Data> <Data>Database 'df16301a-89a5-4bce-bada-733a70c2ef90' doesn't exist.</Data> </EventData> </Event>
This issue might happen if a mailDB was deleted in the past, but the server is still trying to proceed content in it. The solution as explained here is to restart the Microsoft Exchange Mailbox Replication service (which should not cause any outages).