As with Calendar events, tasks are objects that provide calendaring information. Both internally are based on iCalendar format. So, why we couldn’t export tasks in iCal format as we can with Calendar events? Well, now we can.
As you see on the screenshot now we have Export button in the Tasks toolbar. It allows you to export currently displayed tasks or tasks from specified list.
If you enable csv_export plugin that I created for Kolab 14 you will be able to choose output format from iCal and CSV.
The changes are awaiting peer review and will be pushed into the git repository soon. Importing tasks is not yet supported. Any volunteers?