Update Outlook on Mac: Open Microsoft Word, Excel, or another Microsoft Office application, and then click Help > Check for Updates. Update your Mac: Go to System Preferences and click Software Update. Make sure that both macOS and Outlook are up to date. Reset the sync preferences to Fix Outlook synchronization problem.Uncheck all boxes and Restart Outlook in Mac.Go to Menu, then select preferences and click on Sync Services.Start the Outlook for Mac application (if it is possible to open).Resolving ‘Outlook for Mac Synchronization Problem’ How do I fix Outlook for Mac sync errors? Click the identity of the database you want to rebuild, and then click Rebuild.Quit Messenger for Mac and all Microsoft Office applications, including Outlook.On the Outlook menu, click Turn Off Office Reminders.For more information, see Export or manually archive Outlook items.
