Taken fromĀ https://forums.zarafa.com/showthread.php?13331-Kopano-8-1-Outlook-2016-online-search-via-Active-Sync&p=57979&viewfull=1#post57979

Outlook has a builtin capability to create verbose syncing logs. This can be activated in the "Advanced" section of the "Outlook Options"

The generated Logfiles will after a restart be stored at "%temp%\EASLogFiles".