Thank you for reply this.
However, I'm not sure if the fact of stored in seperate lists has anything related with the issue I encountered.
No matter what fundimental storage they use, I suppose the iCal in 10.7 is designed to support drag from reminder and drop to calendar based on:
- the cursor shows a plus sign when to drag the reminder and hover in calendar;
- you got an ical event with same color of source reminder instantly when you drop the reminder (although a few seconds later the error show up as I described above)
When I drag an iCloud task to calender, another error:
https://p01-caldav.icloud.com:443/200<6digi masked here>/principal/ is not a location that supports this request.
I'm not sure about the Exchange error as I do not use that regularly with iCal, but the iCloud error is almost definitely due to the change I mentioned. Old calendars (created before Lion) allow both Events and Reminders, but newly created ones are either marked as 'EventContainer' or 'TaskContainer' and will not allow the other type of entry.