I used to put some incoming emails or notes as ToDo under Reminders in Mail 4.5. It's an essential feature of Mail 4.5 and you were told of such convenience in Apple Retail Stores. All a sudden, it's gone. Though not disappeared, they remain in iCal Reminder. It's bad, bad, bad!
I may need to put up an OS X 10.6.8 Snow Leopard in a virtual machine to bring it back!
