If you've configured Outlook using POP3 or IMAP settings, you won't be able to sync calendars. To sync calendars, you'll ...

If you've configured Outlook using POP3 or IMAP settings, you won't be able to sync calendars. To sync calendars, you'll need to configure your account using Exchange Active Sync (EAS), or use an outlook.com or Office 365 account. To learn more, see Sync basics - what you can and cannot sync