after selecting a calencar for inclusion in caldav in your described setting and re-configuring the caldav entry in the cellphone it works now! The re-configuring (deleting and new configuration) was necessary, without that the tasks didn't show up.
Thanks for your help - below some lines that you can maybe integrate in http://www.group-office.com/wiki/CalDAV_calendar_server
Android with caldav sync client
In order to see the group office tasks list in your android phone, you need to assign a task list to be synchronized.
In Group Office, go to Calendar -> Administration -> Double click your calendar -> Select the caldav tasklist. These tasks will be included in the caldav function.
Also, install the cost free https://play.google.com/store/apps/deta ... dmfs.tasks
"Tasks" app from google play. Then, configure the caldav settings like described below.
If you already had caldav configured, delete the account and re-configure it, else the tasks won't appear in the "Tasks" app.
After installing "caldav sync beta" https://play.google.com/store/apps/deta ... caldav.lib
from google play, in the settings menu, under accounts, there is a new account provider named "caldav". In the caldav provider list following, choose the top entry "caldav" again.
For the server address, use the entry from above (e.g. http://www.domain.tld/caldav
) and enter your username and password.
You then get a list of available calendars in group office. Choose the one(s) to be synchronized. Name the calendar and finish.