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Diagnostics logging levels determine which Microsoft Exchange Server events are written to the Windows NT event log. An event is any significant occurrence in a system or application. You can configure diagnostic logging for Microsoft Exchange Server components to record only highly significant events, such as an application failure, or moderately important events, such as receipt of messages across a gateway, or events relevant only to debugging. Normally, you want to log only critical events.
Note Diagnostics logging affects events only. It does not affect error messages, error alerts, message tracking, or utility logs.
Diagnostics logging is available on the following Microsoft Exchange Server components: