Sync with

All Calendars, Contacts & Notes can be synchronized.

See for general setup.

Warning 1

It's only possible to sync Yahoo Calendar events from the last 6 months, and those up to one year in the future. Events outside of these time frames won't be synced to your device (see for details)

Warning 2

Do not use CalDav synchronization in combination with Yahoo, this can result in random deletion of events.
If you use the built-in Yahoo option via System Settings for setting up a Yahoo account there shouldn't be any problems!

Please see for details about this subject