Hi,
During upgrade at lab to Exchange 2013 CU23 getting following Error, after Step 14(out of 18) and after some troubleshooting with eseutil, got the Clean Shutdown state and then unable to defragment the mailbox DB. Also, facing error while mounting the database.
System.InvalidOperationException: Failed to mount database "MailboxDatabaseName". Error: An Active Manager operation failed. Error: The database action failed. Error: Operation failed with message: MapiExceptionDatabaseError: Unable to mount database. (hr=0x80004005, ec=1108)
Error: Access to source database 'MailboxDatabaseName failed with Jet error -1811. Operation terminated with error -1811 (JET_errFileNotFound, File not found)