iCloud and Kerio

We have been using this application for several months without any single issue. It has very robust features for displaying event and tasks calendars. The iOS version does a great job with tasks. The desktop version does an even better job by allowing you to view tasks and events in one application... better, easier and more features than Calendar or Reminders. It works well with iCloud and Kerio server across OSX and iOS devices all syncing seamlessly together.

BusyCal Great about BusyToDo