This article was previously published under Q230215
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When you attempt to perform an online backup of the Microsoft Exchange directory and information store services on a single processor server, you do not receive any error messages indicating the database failed checksum verification during backup, and the backup process indicates it completed successfully.
To resolve this problem, obtain the latest service pack for Exchange Server version 5.5. For additional information, click the following article number to view the article in theMicrosoft Knowledge Base:
191014 XGEN: How to Obtain the Latest Exchange Server 5.5 Service Pack
The English version of this fix should have the following file attributes or later:
Microsoft has confirmed that this is a problem in Microsoft Exchange Server version 5.5 Service Pack 2. This problem was first corrected in Exchange Server 5.5 Service Pack 3.
During the backup process, JET, the underlying database engine for Microsoft Exchange Server, performs a checksum verification of each page read from the database to ensure the health of the database being backed up. This issue indicates that it is possible on single processor computers for Windows NT Backup or other third-party backup utilities to inadvertently back up a corrupted database without warning or errors.
For additional information on the checksum process, please see the following article in the Microsoft Knowledge Base: