You can export tasks in the iCal format. You can e.g. use this format to exchange tasks with other calendar applications. You can export single tasks or all tasks from a folder.
How to export single tasks:
Select at least one task in the list view.
Click the More actions icon in the toolbar. Click on Export. The Export selected window opens.
Click on Export.
Result: The iCAL file with the tasks exported will be created in the download folder.
How to export all tasks from a folder:
Select a personal or public task list in the folder view.
Click the Actions icon next to the folder name. Click on Export. The Export folder window opens.
Click on Export.
Result: The iCAL file with the tasks exported will be created in the download folder.