%1 (%2) %3From information provided by the headers of %4, the file is not a database file. The headers of the file may be corrupted.

This Warning event indicates that the designated database file is not in an acceptable format. The designated file is not a database file. The headers of the file may be corrupted.

To resolve this warning, do one or more of the following:

• Make sure that the file is a valid database file.

• Check your settings and ensure that they point to the correct file.

• Restore from a backup.

If you are not already doing so, consider running the tools that Microsoft Exchange offers to help administrators analyze and troubleshoot their Exchange environment. These tools can help you make sure that your configuration is in line with Microsoft best practices. They can also help you identify and resolve performance issues, improve mail flow, and better manage disaster recovery scenarios. Go to the Toolbox node of the Exchange Management Console to run these tools now. For more information about these tools, see Toolbox in the Exchange Server 2007 Help.