Calendar and address book with Dovecot

[mimicafe at gmail.com]

Hi all

I recently install Postfix and Dovecot, and so far so good. My assumption
was that calendar and address book (similar to Gmail calendar or address
book) are part of Dovecot. However I do not see anything concerning them in
any of the docs I have read so far.

What other software (ideally open source, free) do I need in other to have
Calendar and address book so my users can manage their contact on their
phones or computer? I have looked at Roundcube already, but my requirement
is not necessarily to provide web mail.

Thanks

Mimi