Office 2013 - You are not responding to the latest message error

We recently moved from Exchange 2010 to 2013. Our users are running Office 2013. Today we had a report of a situation matching the one below for the first time. I found this exact description of our problem in a thread related to Office 2010, but it seems it was resolved with a patch in 2012. Has anyone experienced this issue with Office 2013?

Conversation going on between A, B & C.  All of the sudden you don't like what C said so you forward it to D telling them you disagree with C.  Guess what.  C can see that comment you sent to D even though it was not intended for them.  If C decides to send a second comment, that alert pops up, they click view most recent,,,,BUSTED!  the new email to D will be displayed.  Co-worker "C" is now aware of the conflict of interest.  

If anyone has any insight I would appreciate hearing your solution. We are digging for info, but not finding much to help as of yet.
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JohnBusiness Consultant (Owner)Commented:
I respond to "not the latest message" frequently and without issue. But I do not use Conversations. Do you have Conversations enabled?
redlamp27Author Commented:
Hi John,

This is not happening to all of my users, as we spent quite a bit of time trying to reproduce it this afternoon with no luck. We did get to see it on this specific users system though. No, conversations were not enabled.

She had two different occurrences of this issue. In one case, she does have full access permissions to the mailbox of the user, although she wasn't included in these specific emails. In the other, she has no special permissions for the user.

redlamp27Author Commented:
After further review, we are going to blame this issue completely on full access permissions. We have confirmed that this user would have had access to the emails that were appearing in the thread via full access in both instances.

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redlamp27Author Commented:
Problem was found with full access permissions that caused these emails to be searchable.
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