for creating a posted task the preferred method should be "sendItemrequest()"; which
always returns the id of the SENT item (folder/container "mailbox").
How can I retrieve the corresponding id of the posted item (on the calendar)?
I also tried createItemRequest(), but that does also return the id, which points to
the "mailbox" folder.
I'd need the ID to delete or/and update a task.

The id's of the sent item and the id of the posted task look the same up the first
"@" resp. up to the first ":" - any possibility to get/access the posted task with
that "truncated" part?