I donxxx8217;t think this is a permission issue, and herexxx8217;s why
The BES stored the RefID and entryId somewhere within its hidden folders within you mailbox. The BES here is trying to find that message for one of the following reasons:
change status (read/unread)
some other reason for the BES that I have no idea about.
By the MAPI error code of 0x8004010f (MAPI_E_NOT_FOUND 8004010f List of Extended MAPI numeric result codes
) you can tell that the message was not found in the users mailbox.
So maybe the message was hard deleted or maybe the message was deleted, and then the user deleted the trash before the BES had a change to reconcile the message.
Hope this helps. If it was a permission issue then you would have got a permission related error message.