Out of the box, Enterprise Library supports writing to Windows Logs (e.g. Application, or a custom log). Application and Services logs are different (see: Technology Summary for Reading and Managing Event Logs) and are not supported in the current release. If you want to log to a custom Windows Log then you can do that by creating the log and the event sources and then configuring the logging block. See How to: Create and Remove Custom Event Logs.
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Randy Levy
Enterprise Library support engineer
entlib.support@live.com