Fix Microsoft Exchange Server Error 4999

Microsoft Exchange Server Error 4999 is a critical error that can occur when the Microsoft Exchange Information Store service fails to start. Here are some steps you can follow to fix this error:

1. Check Event Viewer: The first step is to check the Event Viewer for more information about the error. Look for any error messages related to the Exchange Information Store service.
2. Check system files: If there are issues with system files, it can cause the Exchange Information Store service to fail. Use the System File Checker (SFC) utility to scan and repair any corrupted system files. To use SFC, open Command Prompt as an administrator and type “sfc /scannow” and hit Enter.
3. Restart the server: Sometimes, simply restarting the server can fix the issue. Restart the server and check if the Exchange Information Store service starts without any error.
4. Check database consistency: Use the Eseutil tool to check the consistency of the Exchange database. Open Command Prompt as an administrator and type “eseutil /mh <database path>” and hit Enter. If the state of the database is inconsistent, use “eseutil /p <database path>” to repair it.
5. Check disk space: Check if there is enough disk space available on the server where Exchange Server is installed. Insufficient disk space can cause the Exchange Information Store service to fail.
6. Check for hardware issues: If none of the above steps fix the issue, it could be due to hardware problems. Check for any hardware issues such as faulty hard drives, RAM, or CPU.

In conclusion, Microsoft Exchange Server Error 4999 is a critical error that can occur due to various reasons. By following the steps outlined above, you can fix this Exchange Server Error 4999 error and ensure that the Exchange Information Store service starts without any issue. If the issue persists, it is recommended to contact Microsoft Support for further assistance.