Data is Lost During Restore due to Circular Logging Being Enabled

After performing a restore of a Microsoft Exchange Server 2010 server, data is missing.

Circular Logging is enabled on a database with fewer than three copies. Without a complete set of transaction log files,�data more recent than the last full backup can not be recovered.

In a normal production environment, circular logging isn't recommended.

For information about how to enable and disable circular logging, see Configure Mailbox Database Properties.

For more information on this topic, see the following document from Microsoft TechNet online:

Understanding Transaction Logging
http://technet.microsoft.com/en-us/library/bb331958.aspx#UTL

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