I just install the exchange 2013 and install the CU6.
When the secretary try to assign a shared task (from her manager mailbox) to someone she get the following email:
Your message did not reach some or all of the intended recipients.
Subject: Task Request: Order Rio De Janeiro Ticket
Sent: 03/12/2014 09:24
The following recipient(s) cannot be reached:
Someone on 03/12/2014 09:24
This message could not be sent. Try sending the message again later, or contact your network administrator. Error is [0x80070005-00000000-00000000].
1) The secretary have full access in her boss mailbox
2) I try with another manager with the same scenario and the same occurs
3) Delete Outlook profile recreate and the same
4) Download the delete the OAB and try to assign the task from it (instead of using auto complete) but the same