%1 (%2) %3Database recovery/restore failed with unexpected error %4.

This Error event indicates that a database page read failed verification due to a page checksum mismatch. The particular database page referenced within the Exchange store file (such as priv1.edb) is corrupt.

Possible symptoms are:

• Users cannot send or receive e-mail messages.

• You cannot start Microsoft Outlook on your client computer.

• Online backups fail to complete with a -1018 checksum error.

• Online defragmentation reports a -1018 checksum mismatch error.

This error indicates some level of unreliability in the underlying platform ability to correctly store or retrieve data from the Exchange database file. In some cases, the page in the database has not been damaged, and the error is: The error may be transient if the problem is in RAM or caused by a firmware malfunction rather than because the actual page in the database has been damaged.

Alternatively, Error -1811 (hexadecimal 0xFFFFF8ED) corresponds to JET_errFileNotFound and is described as File not found.

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

• If the error code listed in the event description is -515, review Microsoft Exchange Server Analyzer article ESE 454 -515: Missing Required Transaction Log File.

• Run system diagnostic tests. These tests may not be conclusive if the problem is infrequent and transient or only appears under very complex loads.

• Consider migrating to different hardware.

• Upgrade disk controller BIOS and firmware to the latest vendor revisions.

• Review Microsoft Knowledge Base article 314917, Understanding and analyzing -1018, -1019, and -1022 Exchange database errors.

• Repair the database with the eseutil /P, followed by eseutil /D and then isinteg -fix.

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.