Outlook 2010: The reply of Calendar invite from Secretary went to Executive instead of Secretary

Problem: Secretary has right to send invite from Executive's calendar, but all the responses come back to Executive's inbox which is not desired.

Solution: add secretary to Outlook Delegates of Executive

Sang: Got error of "The Delegates settings were not saved correctly. Unable to activate send-on-behalf-of list. You do not have sufficient permission to perform this operation on this object." while trying to add secretary to the delegates.

MS KB: following this KB, http://support.microsoft.com/kb/2593557 to edit the registry has not fixed the problem. Read closely in the Cause section and found out another possible cause, The SELF object does not have the Write Personal Information right on your Active Directory user object. Corrected it and worked!!!!