I took a look at the roundcube website and noticed that on there screen shots that they have calendar and tasks. Is there a way of getting this active on the MIAB install?
Again major kudos for MIAB - really great piece of kit, and the forums and setup guide are some of the best I have seen and dealt with!
You can use the calendar from OwnCloud in your MIAB. Works out of the box.
I see that you can use Owncloud for contacts and Calendar. But can you access that all through the Roundcube webmail interface.
This is probably not going to happen. Join the discussion on what the ‘next’ replacement will be of Owncloud (en thus the calendar) here: https://github.com/mail-in-a-box/mailinabox/issues/514