Event ID 9340 is logged by Windows Event Viewer whenever a Cached Exchange Mode (CEM) server fails.
Servers that are CEM-capable are disconnected or removed from the server.
- Event ID 9340 in Exchange 2003 is an error that occurs when users perform certain operations.
- The cause of the Event ID 9340 error is usually due to corrupted files or outdated system components.
- The error can be resolved by repairing the Exchange component, running ESEUTIL, or installing the relevant update.
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Run the Exchange Setup tool
- Open the Event Viewer and select the Application logs option.
- Right-click on Microsoft Exchange Server 2003 and then click on Properties.
- Check the Log on failure and Logon failure options, and click on the Advanced tab.
- Click on the Error messages tab, and check Log all errors.
- Click Apply, and then click on OK.
Run the Setup tool as an administrator
- Open the Exchange Management Console > right-click the Organization > select Properties.
- Select the Security tab > check the Read permission checkbox > click OK.
- Click on Start > select Run > type msiexec /i /qn “
\Setup.exe” /A /p 
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Run the Setup tool as Exchange 2003
- Right-click Exchange 2003 in the Programs section.
- Select the Run as administrator option.
- Then double-click Setup.exe to open the Setup wizard.
- Press the Next button to proceed.
- Select the Repair option on the Installation Type screen.
- Press the Next button.
- Then select the Exchange server you want to repair, and click Next.
- Press the Next button.
- Select the Repair option on the Repair screen.
- Press the Next button.
Roll back Exchange 2003 Service Pack 2
- Run the Microsoft Support and Recovery Tools
Run the Uninstall Exchange 2003 SP1 and SP2 tool
Run the Exchange 2003 Uninstallation wizard
Run the Microsoft Exchange Server 2003 Service Pack 2 Uninstall wizard
Run the Exchange 2003 Setup wizard - Run the Microsoft Exchange 2003 Uninstall Wizard
Run the Microsoft Exchange Management Console
Run the Microsoft Exchange System Manager - Run the Microsoft Exchange System Manager Setup Wizard
- Reinstall Exchange 2003
Perform an IIS reset
- Launch Command prompt as administrator, and type the below lines one by one and press Enter after each:
net stop w3wp - net stop http
- net stop iis
- net stop w3svc
- net stop httpsvc
- net stop rpconnt
- net stop w3wp
- net stop iis
- net stop w3svc
- net stop httpsvc
- Restart the Windows Mail service.
- Run the Exchange Management Console.
- Navigate to the Database Availability Group – Mailbox.
- Expand the Database Availability Group, and then select the Mailbox Server.
- Click on the Properties option.
- Select the Clients tab.
- Select the Client Access server, and then click on Properties.
- Check the Client Access Server Status, and then ensure that it is Running.
