How do I sync calendar items by using CalDAV in Nokia N9?

You can use CalDAV in your Nokia N9 phone to synchronise calendar items between your phone and remote calendar service (e.g. Google, Yahoo). Set up the calendar synchronisation in the following way:
Select Accounts > Add accounts > CalDAV.
Define Username (e.g. your Google or Yahoo email address).
Define your password.
Define Server URL (check with your service provider, e.g. google.com or https://caldav.calendar.yahoo.com).
Select Sign in.
After the sign in, you can define the calendar synchronising schedule and save the profile.

Source: http://europe.nokia.com/support/prod...t/isync/faq#08