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Re:Aquaris E4.5 Ubuntu Edition by chipaca on Friday April 10, 2015 @11:27AM (#9354952)
Calendar syncing to google should work (but i haven't checked, and i don't know whether it would meet your other qualifiers).
Re:Aquaris E4.5 Ubuntu Edition by Brakenshire on Friday April 10, 2015 @01:53PM (#9355958)
It really should have full CalDav and CardDav support out of the box.