Turn on logging

Logging is a diagnostic tool primarily used by support professionals to help troubleshoot Outlook issues. By default, logging is turned off. If you have problems with Outlook, you can turn on logging. Logging records autodiscovery, Exchange (folder and items synchronization), Exchange Calendar, and LDAP transactions between Outlook and Microsoft Exchange Server. The data file contains information such as:

  • Issues when sending or receiving e-mail messages, calendar items, notes, tasks, and meeting requests

  • Type or severity of errors, if known

The data file may also contain information that identifies you, that could be used to contact you, or that might be considered sensitive or confidential. For example, when logging is enabled, the data file collects all data that Outlook synchronizes with the Exchange Server, including your name, IP address, sender and receiver’s e-mail addresses, and the contents of your e-mail messages, notes, tasks, calendar, and contacts. Microsoft does not use this information to contact you without your consent.

If you are concerned that your data file contains sensitive or confidential information, you may review the contents of the data file using text-editing software, and remove the information from the file prior to sending the data file to support professionals.

The information in the data file is for diagnosing and developing solutions to problems in the software and to improve the software in general. Microsoft receives only the data files that you choose to send.

Important: Turn off logging when troubleshooting is complete. Otherwise, the log files continue to grow in size and might cause decreased performance in Outlook.

  1. On the Window menu, click Error Log.

  2. Click the Action button Action button .

  3. Select the Turn on logging for troubleshooting check box.


    • Data files are written to the desktop with the name Microsoft Outlook_DebugLog_0.log.

    • Outlook does not include authentication information in the data files.

    • Outlook appends new log entries to the data file until the file is either moved or deleted.

See also

Outlook is running slowly

View the privacy statement

Share Facebook Facebook Twitter Twitter Email Email

Was this information helpful?

Great! Any other feedback?

How can we improve it?

Thank you for your feedback!