Circular logging automatically deletes log files that are older than a specified checkpoint. This deletion occurs after the data from the log files is written to the database and after the checkpoint passes through the file. By default, circular logging is disabled.

Although circular logging reduces the storage space requirements of the hard disks that contain your transaction logs, you should not enable circular logging in production environments. This is because you cannot recover Exchange 2000 data that is more recent than the last Normal backup without a complete set of transaction logs.

Circular logging is usually used for public folder stores that contain Network News Transfer Protocol (NNTP) news feeds, where roll-forward capabilities are not required. Important If you switch from circular logging to non-circular logging, you must perform a new Normal backup of the Exchange 2000 databases after you switch modes.

The information in this article applies to:

• Microsoft Exchange Server 2003 Enterprise Edition
• Microsoft Exchange Server 2003 Standard Edition
• Microsoft Windows Small Business Server 2003, Premium Edition
• Microsoft Windows Small Business Server 2003, Standard Edition
• Microsoft Exchange 2000 Server