If you must keep logging enabled for several hours or several days in order to capture the issue, make sure that the hard disk has sufficient free space. If logging is not turned off, the log files size will continue to increase. It is important to turn off logging after you complete your troubleshooting and reproduce the issue. If you disable logging manually you must restart Outlook to fully disable logging, otherwise it will continue logging in the background.

Restart Outlook and when prompted to turn off logging select Turn Logging Off.

In the Error window, select the Gear icon.

To enable logging in Outlook for Mac 2011, follow these steps If you disable logging manually, you must restart Outlook to fully disable logging, otherwise it will continue logging in the background.

Restart Outlook and when prompted to turn off logging, select Turn Logging Of.

Restart Outlook and when prompted to turn off logging select Leave Logging On and reproduce the issue you experience and then Quit Outlook to stop the log capture.

Select the Turn on logging for troubleshooting option, and then select OK.

In the Sync Errors window, select the Gear icon.

On the Window menu, select Sync Errors.

More information To enable logging in Outlook 2016 for Mac, follow these steps

In Outlook 2016 for Mac version 15.12.3 and later versions, the following features are also logged in addition to those listed earlier:

Microsoft Exchange (folder and item synchronization).Outlook for Mac provides the option to enable logging for the following features:

Outlook mac sync errors